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Carbohydrates - Fuel For The Human Body (view source)

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→‎Lesson 7 - Carbohydrates - Fuel For The Human Body

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For one, they are both water soluble. In addition, they have a sweet taste and a crystalline structure. The monosaccharides and disaccharides are called sugars and all share the suffix, -ose, meaning sugar.

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Polysaccharides, in contrast to mono- and disaccharides, are insoluble in water, do not taste sweet and do not form crystals. Also, they do not share a suffix and have no group name (such as sugars, in the case of mono-arid disaccharides). They are sometimes called starches, but this is technically incorrect because there are many other classifications of polysaccharides besides starches (cellulose and glycogen being two and dextrin being another).

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Polysaccharides, in contrast to mono and disaccharides, are insoluble in water, do not taste sweet and do not form crystals. Also, they do not share a suffix and have no group name (such as sugars, in the case of mono-arid disaccharides). They are sometimes called starches, but this is technically incorrect because there are many other classifications of polysaccharides besides starches (cellulose and glycogen being two and dextrin being another).

==== Monosaccharides ====

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==== Glucose (also known as dextrose or grape sugar) ====

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This monosaccharide is the most important carbohydrate in human nutrition because it is the one that the body fuses directly to supply its energy needs. Glucose is formed from the hydrolysis of di- and polysaccharides, including starch, dextrin, maltose, sucrose and lactose; from the monosaccharide fructose largely during absorption; and from both fructose and galactose in the liver during metabolism.

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This monosaccharide is the most important carbohydrate in human nutrition because it is the one that the body fuses directly to supply its energy needs. Glucose is formed from the hydrolysis of di and polysaccharides, including starch, dextrin, maltose, sucrose and lactose; from the monosaccharide fructose largely during absorption; and from both fructose and galactose in the liver during metabolism.

Glucose is the carbohydrate found in the bloodstream, and it provides an immediate source of energy for the body’s cells and tissues. Glucose is also formed when stored body carbohydrate(glycogen) is broken down for use.

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Most starches are a mix of two different molecular structures, amylose and amylopectin. The former has a linear structure and the latter has a branched or bushy structure. The proportion of the two fractions varies according to the species of plant. For example, potato starch and most cereal starches have approximately 15-30% amylose. But the waxy cereal grains, including some varieties of corn plus rice and grain sorghum, have their starch most entirely as amylopectin. The starches in green peas and in some sweet corn varieties are mainly amylose.

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The polysaccharides, as mentioned earlier, are not water soluble as are the mono- and disaccharides. Though not water soluble, starches can be dispersed in water heated to a certain temperature. The granules swell and gelatinize. When cooled, this gelatin sets to a paste. The jelling characteristics of starches are considered to result from the amylose present, while amylopectin is considered to be responsible for the gummy and cohesive properties of the paste.

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The polysaccharides, as mentioned earlier, are not water soluble as are the mono and disaccharides. Though not water soluble, starches can be dispersed in water heated to a certain temperature. The granules swell and gelatinize. When cooled, this gelatin sets to a paste. The jelling characteristics of starches are considered to result from the amylose present, while amylopectin is considered to be responsible for the gummy and cohesive properties of the paste.

==== Dextrin ====

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==== Carbohydrates Provide Fuel for the Muscular System ====

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Carbohydrates provide the major fuel for muscular exercise. Fats and proteins can be used only indirectly—by first being converted into carbohydrates. For this reason, a proper diet should consist primarily of carbohydrates—not primarily of proteins and fats as are commonly consumed in conventional nonvegetarian (and some lacto- and lacto-ovo vegetarian) diets.

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Carbohydrates provide the major fuel for muscular exercise. Fats and proteins can be used only indirectly—by first being converted into carbohydrates. For this reason, a proper diet should consist primarily of carbohydrates—not primarily of proteins and fats as are commonly consumed in conventional nonvegetarian (and some lacto and lacto-ovo vegetarian) diets.

The muscles use the glycogen present in the muscle cells and glucose in the blood stream. However, glycogen from the muscles is more efficiently used than glucose because the breakdown of glycogen for use does not require energy input at the time, whereas a certain amount of energy is used to bring the blood sugar into the metabolic system of the muscles. (It does require energy to build up the glycogen supply in the first place, but this happens during periods of rest when plenty of energy is available.)

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If a diet high in carbohydrates is not consumed, tremendous muscular exertion over long periods and/or extreme and prolonged stress (as being stranded for weeks in Antarctica) can result in accelerated breakdown of body protein and stored body fat. The protein breakdown is evidenced by an increased excretion of nitrogen in the urine, and the fat breakdown is evidenced by a rise in the level of ketone bodies in the urine and in the blood. The blood sugar level is simultaneously lower.

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The body works much more efficiently from carbohydrate intake than from broken- down body protein and fats because protein and fat molecules, when used as fuel, yield less than their total caloric value in the form the muscles can use. The remaining portion is used for the conversion of these molecules into suitable fuel. This conversion takes place in the liver and adipose tissue, which supply the body’s organs with fuel via the bloodstream.

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The body works much more efficiently from carbohydrate intake than from broken down body protein and fats because protein and fat molecules, when used as fuel, yield less than their total caloric value in the form the muscles can use. The remaining portion is used for the conversion of these molecules into suitable fuel. This conversion takes place in the liver and adipose tissue, which supply the body’s organs with fuel via the bloodstream.

The fact that the body can and will use body fats and proteins when the supply and stores of blood sugar and glycogen are not great enough to meet the demand for energy exemplifies two facts: 1) The organism is provident. It has many back-up arrangements for survival in emergency situations when sufficient carbohydrates are not available. 2) An appropriate balance between supplying body needs (such as rest and carbohydrates) and expending energy (muscular, nervous or other) should be strived for to attain optimum health and well-being.

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Substances or nutrients pass through the intestinal membrane through the process of osmosis in one of two ways: 1) diffusion or 2) active transport. Substances and nutrients in the intestinal tract that are in higher concentration than across the membrane in the blood and lymph pass through by diffusion. This is a simple osmotic process in which no energy has to be expended. Fructose is absorbed by diffusion.

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Active transport is the osmotic process used when substances or nutrients are ~~ab- sorbed~~ from an area of lower concentration across a membrane to an area of higher concentration. This process requires energy for the absorption, as well as a “carrier” to transport the substance. The carrier substance is thought to be a protein or lipoprotein (a combination of a protein and a fat). Glucose and galactose are absorbed into the bloodstream by active transport. Monosaccharides are absorbed by the capillaries, which empty into the portal vein, which in turn carries them directly to the liver.

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Active transport is the osmotic process used when substances or nutrients are absorbed from an area of lower concentration across a membrane to an area of higher concentration. This process requires energy for the absorption, as well as a “carrier” to transport the substance. The carrier substance is thought to be a protein or lipoprotein (a combination of a protein and a fat). Glucose and galactose are absorbed into the bloodstream by active transport. Monosaccharides are absorbed by the capillaries, which empty into the portal vein, which in turn carries them directly to the liver.

==== Carbohydrate Metabolism ====

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A later lesson will discuss in depth which foods are acid-forming and which are alkaline-forming and why we should have a predominance of alkaline-forming foods in our diet. Suffice it to say here that most grains and legumes are acid-forming and, for this reason, should be eaten in extreme moderation, if at all.

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Grains contain phytic acid, a substance which binds calcium and iron, both in the grains themselves and the body stores of these minerals. This fact only complicates and aggravates the problem of calcium being taken from the bones and teeth by the body in the metabolism of carbohydrates that have been refined and their minerals, therefore, ~~re- moved~~.

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Grains contain phytic acid, a substance which binds calcium and iron, both in the grains themselves and the body stores of these minerals. This fact only complicates and aggravates the problem of calcium being taken from the bones and teeth by the body in the metabolism of carbohydrates that have been refined and their minerals, therefore, removed.

Anyone concerned about getting enough calcium should not eat grains. People who suffer with nervousness, sleeplessness and/or cramps may already be experiencing some of the symptoms of calcium deficiency. Getting carbohydrates from fresh fruits, and consuming dark green leafy vegetables, possibly along with a few occasional nuts, seeds and/or avocado's, will insure adequate intake of usable calcium. Consuming grains in addition to the wholesome foods mentioned above is defeating of your purpose and is to be discouraged.

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When most people think about amounts of carbohydrates to consume, they think in terms of calories—units for measuring heat. One calorie is the amount of heat required to raise the temperature of one kilogram of water one degree Centigrade. The amount of heat liberated by a complete breakdown of a food into its metabolic end products is expressed in calories.

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For purposes of this course, however, calories are unimportant. Obtaining them is important, but numbers are not. Texts say that an average person needs a minimum of 1800 calories per day for just existing and more for any activities indulged. But, as mentioned in an earlier lesson, the variance is so great when it comes to individual needs, and people on conventional high-protein diets that include meat, etc., require so much extra energy to handle the constant input of toxins, causing an additional variance ~~be- tween~~ “norms” and the actual needs of a truly healthy person, that the guidelines in the texts are practically useless. Besides, humans have always been able to get all the calories they need without counting them—and without even knowing about their existence.

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For purposes of this course, however, calories are unimportant. Obtaining them is important, but numbers are not. Texts say that an average person needs a minimum of 1800 calories per day for just existing and more for any activities indulged. But, as mentioned in an earlier lesson, the variance is so great when it comes to individual needs, and people on conventional high-protein diets that include meat, etc., require so much extra energy to handle the constant input of toxins, causing an additional variance between “norms” and the actual needs of a truly healthy person, that the guidelines in the texts are practically useless. Besides, humans have always been able to get all the calories they need without counting them—and without even knowing about their existence.

So, in this section, we will take a more practical approach to the question of how much carbohydrate we need in our diet.

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=== Disease Conditions Related To Carbohydrate Consumption ===

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The following plus many more diseases are considered, by the medical world and by some lay people alike, to be either caused by or related to carbohydrates of various kinds in the diet. At this place in this course, we will not delve into any depth on these ~~dis- ease~~ conditions, as they will be treated in separate later lessons. Here we will just briefly mention a few of the more common conditions related to carbohydrate consumption.

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The following plus many more diseases are considered, by the medical world and by some lay people alike, to be either caused by or related to carbohydrates of various kinds in the diet. At this place in this course, we will not delve into any depth on these disease conditions, as they will be treated in separate later lessons. Here we will just briefly mention a few of the more common conditions related to carbohydrate consumption.

==== Lactose Intolerance ====

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Galactosemia is another disease condition related to milk, or lactose, consumption. This disorder, labeled “an unusual hereditary disorder,” occurs in infants. Galactosemia is among the diseases that supposedly result from “inborn errors of metabolism.” In this condition, a specific enzyme (p-galactose-uridyl-transferase) is lacking, so the infant cannot properly digest the sugars in milk. Specifically, the monosaccharide galactose, which does not occur free in nature but results from the hydrolization of lactose from milk, cannot be converted to glucose.

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Infants with this disorder vomit when they’re fed milk and other dairy foods. They become lethargic and fail to gain weight. Their liver and spleen become enlarged (from overwork), cataracts develop and they become mentally retarded. In severe cases, death can occur. The solution to this problem is a milk- (and other dairy products) free diet, according to the texts. What is fed to babies instead of milk is not listed, but we would recommend freshly-made fruit juices in season, perhaps along with (at separate feedings, of course) homemade nut, seed or soy milk, depending upon the infant’s tolerance to these. (The subject of care and feeding of infants and children will be treated in more depth in later lessons.)

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Infants with this disorder vomit when they’re fed milk and other dairy foods. They become lethargic and fail to gain weight. Their liver and spleen become enlarged (from overwork), cataracts develop and they become mentally retarded. In severe cases, death can occur. The solution to this problem is a milk(and other dairy products) free diet, according to the texts. What is fed to babies instead of milk is not listed, but we would recommend freshly-made fruit juices in season, perhaps along with (at separate feedings, of course) homemade nut, seed or soy milk, depending upon the infant’s tolerance to these. (The subject of care and feeding of infants and children will be treated in more depth in later lessons.)

==== Dental Caries ====

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Meats and dairy foods, as well as whole grains, are acid-forming in the body. Calcium is needed to neutralize the acidity and maintain the normal blood alkalinity of 7.40 pH. After the calcium available in the body is used up, this mineral is taken from the bones and teeth.

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As you can see, fruits are to be preferred over grains, meats, milk or dairy foods as sources of carbohydrates. Their sugars will not cause cavities, but fragmented foods (refined products) and unnatural foods (meats, milk, dairy, grains) will! From the ~~stand- point~~ of maintaining body calcium, the best choices of starch foods would be the tubers—potatoes, sweet potatoes, yams, and carrots.

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As you can see, fruits are to be preferred over grains, meats, milk or dairy foods as sources of carbohydrates. Their sugars will not cause cavities, but fragmented foods (refined products) and unnatural foods (meats, milk, dairy, grains) will! From the standpoint of maintaining body calcium, the best choices of starch foods would be the tubers—potatoes, sweet potatoes, yams, and carrots.

No one ever need fear dental decay, even on a diet of sweet fruits. The important factor here is not to eat processed or refined foods or foods that are not suited to our biological adaptations. (The subject of sugar and other sweeteners will be treated in greater depth in a future lesson.)

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=== Why has our need for protein become so exaggerated? Why is our need for carbohydrates underestimated? ===

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The meat and dairy industries, with the support of the government, are largely responsible for the “protein fashion.” Their message has become a part of the public education systems—its textbooks, its universities, everything it teaches. They want us to believe that those foods which are most unhealthful, foods such as meat, fish, eggs, milk and cheese, are the most important part of our diet. Secondarily, ~~carbo- hydrates~~ from grains and breads are promoted—this mostly for the benefit of the refining and baking concerns that bring us Wonder Bread, Cheerios, Pop Tarts, etc. Fruits and vegetables are given very low priority, as the money to be made from marketing these foods is much less than from the nonperishable “foods” and the animal products.

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The meat and dairy industries, with the support of the government, are largely responsible for the “protein fashion.” Their message has become a part of the public education systems—its textbooks, its universities, everything it teaches. They want us to believe that those foods which are most unhealthful, foods such as meat, fish, eggs, milk and cheese, are the most important part of our diet. Secondarily, carbohydrates from grains and breads are promoted—this mostly for the benefit of the refining and baking concerns that bring us Wonder Bread, Cheerios, Pop Tarts, etc. Fruits and vegetables are given very low priority, as the money to be made from marketing these foods is much less than from the nonperishable “foods” and the animal products.

==== Why have carbohydrates been underemphasized? ====

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==== Is it possible for a person to gain weight on the diet you advocate? ====

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Yes. Except in rare (relatively) cases where emaciation has occurred, gaining fat is usually not desirable. Many studies have shown that exceptionally lean people have longer lifespans and fewer diseases than people we would consider of “normal” weight. As a rule, lean is best. The important factor is the building of muscle, which can be done with the use of weights, along with a well-rounded exercise program (stretching exercises and aerobic exercises) or to a lesser degree without the use of weights. Body muscle can be developed in any number of ways—from swimming or running (or both) to calisthenics or tennis. Ideally, your program should include some resistance exercises (weights, push-ups, pull-ups, sit- ups, etc.), some aerobic activities and some stretching exercises, and should work all the body muscles. A truly attractive body is not one with five or ten pounds of extra fat, but one that is firm and filled out by normal musculature.

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Yes. Except in rare (relatively) cases where emaciation has occurred, gaining fat is usually not desirable. Many studies have shown that exceptionally lean people have longer lifespans and fewer diseases than people we would consider of “normal” weight. As a rule, lean is best. The important factor is the building of muscle, which can be done with the use of weights, along with a well-rounded exercise program (stretching exercises and aerobic exercises) or to a lesser degree without the use of weights. Body muscle can be developed in any number of ways—from swimming or running (or both) to calisthenics or tennis. Ideally, your program should include some resistance exercises (weights, push-ups, pull-ups, sit-ups, etc.), some aerobic activities and some stretching exercises, and should work all the body muscles. A truly attractive body is not one with five or ten pounds of extra fat, but one that is firm and filled out by normal musculature.

For those people who are emaciated and do need to gain fat, this should not be rushed. In addition to obtaining generous amounts of exercise (as outlined briefly above), the excessively thin person should make sure his or her life is not too stressful. Also, he or she should consider a fast if there is a chance that adequate calories have been consumed but the body is unable to use them. A physiological rest may be needed more than tremendous amounts of food in this case.

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==== I and many other people have more regular bowel movements because we include bran in our diet. Would you consider this a fairly wholesome part of some people’s diet because of its anti-constipation effect? ====

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Absolutely not! Bran is a food fragment; that is, it is only part of the whole wheat berry. It has many sharp edges which irritate and cut the delicate tissues ~~with- in~~ the gastrointestinal tract. Humans require their carbohydrate in the form of ~~us- able~~ sugars—not in the form of indigestible cellulose.

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Absolutely not! Bran is a food fragment; that is, it is only part of the whole wheat berry. It has many sharp edges which irritate and cut the delicate tissues within the gastrointestinal tract. Humans require their carbohydrate in the form of usable sugars—not in the form of indigestible cellulose.

As far as regular bowel movements go, you will definitely have them on a diet consisting primarily of the foods of our biological adaptation—fresh fruits. It is not for you, me or anyone else to decide how large or how frequent our bowel movements should be—this is strictly a body process that should remain entirely on a subconscious level. We should never have to think about it at all, let alone talk about it. And on the proper diet, you can be sure that everything is happening as it should within your body, for, as you know, the inherent intelligence of your body is great. Our only responsibility is to provide the normal needs of life—and then just live. The body will take care of its own needs.

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While the sugars are all soluble, raw starch is insoluble. Boiling will render part of it soluble. This, however, hinders its digestion. Starch is converted into a disaccharide in the mouth, and this is converted into a monosaccharide in the intestine.

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The body cannot use starch. It must first be converted into sugar before it can be utilized by the cells. This is done in the process of digestion and begins in the mouth. Disaccharides and polysaccharides are converted into monosaccharides in the process of digestion, as carbohydrates can be absorbed and assimilated only as monosaccharides. Starch must first be converted into sugar, and the complex sugars must be converted into simple sugars before they are absorbed. The body’s need for sugar may easily be ~~sup- plied~~ without eating commercial sugars and syrups or any form of denatured carbohydrate. Child and adult alike should eat only natural sweets and starches.

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The body cannot use starch. It must first be converted into sugar before it can be utilized by the cells. This is done in the process of digestion and begins in the mouth. Disaccharides and polysaccharides are converted into monosaccharides in the process of digestion, as carbohydrates can be absorbed and assimilated only as monosaccharides. Starch must first be converted into sugar, and the complex sugars must be converted into simple sugars before they are absorbed. The body’s need for sugar may easily be supplied without eating commercial sugars and syrups or any form of denatured carbohydrate. Child and adult alike should eat only natural sweets and starches.

Sugar is the most important building material in the plant world. A characteristic difference between plants and animals is that, whereas the animal is built up largely out of proteins, the plant is built up largely out of carbohydrates. Plants may be truly said to be made of sugar. They contain various minerals and some nitrogen, but practically the whole fabric of the plant or tree is composed of sugar in some form. Sugars are essential constituents of all plants without which they cannot exist. Indeed, sugars are the most important and most abundant building materials in plants. Out of the immature or sap sugars, plants build their roots, stems, flowers, fruits and seeds. The finished plant is almost literally made of sugar.

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Stomach (gastric) juice ranges all the way from nearly neutral in reaction to strongly acid, depending upon the character of the food eaten. It contains three enzymes-pepsin, which acts upon proteins; lipase, which has slight action upon fats; and rennin, which coagulates milk. The only one of these enzymes that needs concern us here is pepsin. Pepsin is capable of initiating digestion on all kinds of proteins. This is important, as it seems to be the only enzyme with such power. Different protein splitting enzymes act upon the different stages of protein digestion. It is possible that none of them can act upon protein in stages preceding the stage for which they are specifically adapted. For example, erepsin, found in the intestinal juice and in the pancreatic juice, does not act upon complex proteins, but only upon peptides and polypeptides, reducing these to amino acids. Without the prior action of pepsin in reducing the proteins to peptides, the erepsin would not act upon the protein food. Pepsin acts only in an acid medium and is destroyed by an alkali. Low temperature, as when iced drinks are taken, retards and even suspends the action of pepsin. Alcohol precipitates this enzyme.

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Just as the sight, odor or thought of food may occasion a flow of saliva, a “watering of the mouth,” so these same factors may cause the flow of gastric juice, that is a ~~“water- ing~~ of the stomach.” The taste of food, however, is most important in occasioning a flow of saliva. The physiologist, Carlson, failed in repeated efforts to occasion a flow of gastric juice by having his subjects chew on different substances, or by irritating the nerve endings in the mouth by substances other than those directly related to food. In other words, there is no secretory action when the substances taken into the mouth cannot be digested. There is selective action on the part of the body and, as will be seen later, there are different kinds of action for different kinds of foods.

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Just as the sight, odor or thought of food may occasion a flow of saliva, a “watering of the mouth,” so these same factors may cause the flow of gastric juice, that is a “watering of the stomach.” The taste of food, however, is most important in occasioning a flow of saliva. The physiologist, Carlson, failed in repeated efforts to occasion a flow of gastric juice by having his subjects chew on different substances, or by irritating the nerve endings in the mouth by substances other than those directly related to food. In other words, there is no secretory action when the substances taken into the mouth cannot be digested. There is selective action on the part of the body and, as will be seen later, there are different kinds of action for different kinds of foods.

In his experiments in studying the “conditioned reflex,” Pavlov noted that it is not necessary to take the food into the mouth in order to occasion a flow of gastric juice.

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The mere teasing of a dog with savory food will serve. He found that even the noises or some other action associated with feeding time will occasion a flow of secretion.

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It is necessary that we devote a few paragraphs to a brief study of the body’s ability to adapt its secretions to the different kinds of foodstuffs that are consumed. Later we will discuss the limitations of this power. McLeod’s Physiology in Modern Medicine says: “The observations of Pavlov on the responses of gastric pouches of dogs, to meat, bread and milk have been widely quoted. They are interesting because they constitute evidence that the operation of the gastric secretory mechanism is not without some ~~pow- er~~ of adaptation to the materials to be digested.”

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It is necessary that we devote a few paragraphs to a brief study of the body’s ability to adapt its secretions to the different kinds of foodstuffs that are consumed. Later we will discuss the limitations of this power. McLeod’s Physiology in Modern Medicine says: “The observations of Pavlov on the responses of gastric pouches of dogs, to meat, bread and milk have been widely quoted. They are interesting because they constitute evidence that the operation of the gastric secretory mechanism is not without some power of adaptation to the materials to be digested.”

==== Digestion Proceeds Intelligently ====

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=== Article #3: Starches Are Second-Rate Foods by Marti Fry ===

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Have you noticed how often we state that fruits are the foods to which we are biologically suited? We rank them as first-class foods and we rank starchy foods such as tubers, legumes and grains as second- or third-class foods. One reason for this, as you may know, is that most starchy foods have to be cooked to make them tasty. Of course there are exceptions to this:

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Have you noticed how often we state that fruits are the foods to which we are biologically suited? We rank them as first-class foods and we rank starchy foods such as tubers, legumes and grains as second or third-class foods. One reason for this, as you may know, is that most starchy foods have to be cooked to make them tasty. Of course there are exceptions to this:

# Some people like potatoes, yams, etc., raw.

# Some mildly starchy vegetables such as carrots, peas and cauliflower are palatable in the raw state to most people.

# Many legumes can be sprouted instead of cooked.

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But despite these exceptions, starchy foods are not ideal for humans. Unlike sugars from fruits, which pass almost directly from the stomach to the small intestine for ~~ab- sorption~~, starches must be converted to sugar for the body to unlock their energy potential. Most animals secrete starch-splitting enzymes called amylases, derived from the Latin word meaning—you guessed it—starch-splitting. In humans, starch digestion ~~be- gins~~ in the mouth: Our saliva contains an amylase called ptyalin, from the Greek word ptyalin, meaning saliva. Ptyalin, also called salivary amylase, changes starch chemically into maltose, a complex sugar. Many other animals, such as pigs, birds and other starch eaters, but not humans, secrete other additional amylases to insure complete starch digestion. To be sure bf adequately digesting the starch we humans consume, we must chew our food very, very thoroughly so it becomes well-mixed with saliva. The starch that’s converted to maltose by salivary enzymic action is further broken down in the small intestine by the enzyme maltase into the simple sugar, dextrose, for the bloodstream can absorb only simple sugars, never starches or complex sugars. (Dextrose is dextrorotatory glucose.) Only 30 to 40 percent of the starch eaten can be broken down by ptyalin in the mouth. If starches are eaten with (or close in time to ingestion of) acid fruits (citrus fruits or tomatoes) or with protein foods, the ptyalin in the saliva that’s swallowed with the food cannot further break down the starch into simple sugars. This is because ptyalin can only act in an alkaline environment and the stomach environment becomes acid when proteins are consumed. The acids in fruits will also inhibit the secretion of ptyalin. Hence, you should take care to eat starchy foods (if you eat them at all) with vegetables and not with acid or protein foods to insure the best possible digestion. We do secrete a pancreatic amylase in our intestine to digest starches not handled by salivary amylase (ptyalin). But starches, often partially decompose in the stomach before they get to the intestine. In addition, there’s a problem relative to human starch digestion and this is another reason why starches are usually cooked or sprouted (besides for taste):

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But despite these exceptions, starchy foods are not ideal for humans. Unlike sugars from fruits, which pass almost directly from the stomach to the small intestine for absorption, starches must be converted to sugar for the body to unlock their energy potential. Most animals secrete starch-splitting enzymes called amylases, derived from the Latin word meaning—you guessed it—starch-splitting. In humans, starch digestion begins in the mouth: Our saliva contains an amylase called ptyalin, from the Greek word ptyalin, meaning saliva. Ptyalin, also called salivary amylase, changes starch chemically into maltose, a complex sugar. Many other animals, such as pigs, birds and other starch eaters, but not humans, secrete other additional amylases to insure complete starch digestion. To be sure bf adequately digesting the starch we humans consume, we must chew our food very, very thoroughly so it becomes well-mixed with saliva. The starch that’s converted to maltose by salivary enzymic action is further broken down in the small intestine by the enzyme maltase into the simple sugar, dextrose, for the bloodstream can absorb only simple sugars, never starches or complex sugars. (Dextrose is dextrorotatory glucose.) Only 30 to 40 percent of the starch eaten can be broken down by ptyalin in the mouth. If starches are eaten with (or close in time to ingestion of) acid fruits (citrus fruits or tomatoes) or with protein foods, the ptyalin in the saliva that’s swallowed with the food cannot further break down the starch into simple sugars. This is because ptyalin can only act in an alkaline environment and the stomach environment becomes acid when proteins are consumed. The acids in fruits will also inhibit the secretion of ptyalin. Hence, you should take care to eat starchy foods (if you eat them at all) with vegetables and not with acid or protein foods to insure the best possible digestion. We do secrete a pancreatic amylase in our intestine to digest starches not handled by salivary amylase (ptyalin). But starches, often partially decompose in the stomach before they get to the intestine. In addition, there’s a problem relative to human starch digestion and this is another reason why starches are usually cooked or sprouted (besides for taste):

According to The Textbook of Medical Physiology by Arthur C. Guyton, M.D.:

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Tradition has it that man’s original diet was fruit. While we have no written history of a period when man lived on a fruit diet, there is plenty of evidence to substantiate the view that he once did so. We do know that fruits have historically constituted an important part of man’s diet in most parts of the earth from remote times. Only within recent centuries, and then only in certain parts of the earth, has the notion that fruits have little food value come about.

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Most fruits are abundantly supplied with sugar and it is quite possible to gain weight on a fruit diet. Some fruits, like the avocado and most nuts (nuts are also fruits, technically speaking) contain considerable fat. While few of the pulpy fruits are ~~abundant- ly~~ supplied with protein, some of them do contain a higher percentage of protein than mother’s milk. Practically all nuts are rich in protein of high biological value. One does not have to eat animal foods in order to supply himself with an abundance of all the amino acids required.

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Most fruits are abundantly supplied with sugar and it is quite possible to gain weight on a fruit diet. Some fruits, like the avocado and most nuts (nuts are also fruits, technically speaking) contain considerable fat. While few of the pulpy fruits are abundantly supplied with protein, some of them do contain a higher percentage of protein than mother’s milk. Practically all nuts are rich in protein of high biological value. One does not have to eat animal foods in order to supply himself with an abundance of all the amino acids required.

In the last century a veritable fruitophobia arose both in Europe and America and people refrained from eating fruits because they supposedly caused disease. Fruits were accused of causing various diarrheal diseases, even typhoid and cholera. It is a fact that a large excess of fresh fruit will result in loose stools, but this is not an objection to fruit eating. One has only to cease taking the fruit in excess to have the bowel looseness cease.

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In this connection, sugar means the sweet fruits produced by old mother nature herself, not the processed sugars of commerce. Sugars, whether in the form of sugar (crystals-brown or white) or in the form of syrups that have been separated from their associated nutrients and that have been concentrated and changed, do not constitute ideal foods for man or beast. The maple sugar, cane sugar, beet sugar, milk sugar and fruit sugars of commerce and the syrups and molasses that are freely eaten, whether from cane or maple sap, do not constitute really good foods for man. Honey, even when pure and unchanged, is not a good food for man for much the same reason, and for added reasons. It is a fine food for bees.

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It was believed in Densmore’s day and it is still believed that toasting starch, as in toasting bread, dextrinizes it, thus rendering it more easily digested. Although the ~~toast- ing~~ of bread spoils much of the food value that remains in it after the first baking, and converts part of it into charcoal, precious little dextrinization occurs. Densmore, accepting the dextrinization of bread by toasting, said: “the sweet fruits are removed a step beyond. If there was some method by which a piece of toast could undergo a second transformation and the dextrin be converted into glucose, it would then in all probability be substantially as easy of digestion as the sweet fruits for the simple reason that it would already be glucose; in a word, no digestion would be necessary.”

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It was believed in Densmore’s day and it is still believed that toasting starch, as in toasting bread, dextrinizes it, thus rendering it more easily digested. Although the toasting of bread spoils much of the food value that remains in it after the first baking, and converts part of it into charcoal, precious little dextrinization occurs. Densmore, accepting the dextrinization of bread by toasting, said: “the sweet fruits are removed a step beyond. If there was some method by which a piece of toast could undergo a second transformation and the dextrin be converted into glucose, it would then in all probability be substantially as easy of digestion as the sweet fruits for the simple reason that it would already be glucose; in a word, no digestion would be necessary.”

Certainly, as he contended, sweet foods would be far better for the weakened individual and the invalid, with lowered digestive powers, than would be a diet of starches. If there is one starch food that may be regarded as an exception to this rule, it would be the potato, as its starch is more easily and speedily converted into sugar than the starch of cereals, legumes, etc. But Densmore goes further than a consideration of the interests of the invalid when he says, “it would seem plain that a human being in apparently robust health is much more liable to remain so upon a food that is adapted to his organism and that is of easy digestion, than upon one that is a foreign body and that must undergo a protracted and difficult digestion before being of use to the system.”

'''[[The Immense Wisdom And Providence Of The Body|Back - Lesson 06]] - PDF pages 152-191 - [[Life Science Health System - T.C. Fry|Table of Contents]] - [[Proteins In The Diet|Next - Lesson 08]]'''

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