is digestion a chemical change?
930639
Well it's definitely not a physical change. Not by definition anyway.\nWhat was once food is very chemically altered after going through the digestion process...so YES.
651462
This would not be possilbe.  In the process of digesting and assimilating these essential elements, our bodies create some waste or by-products.  We have to get rid of it somehow.\n\nOur bodies are not Carnot engines - we cannot attain 100% efficiency.  The second law of thermodynamics tells us this (entropy is increasing).\n\nPlus, there are very few pleasures as great as sitting down and passing a nice well-formed turd.
323999
Physical changes only change the appearance of the substance eg - water turns to ice or turns to water vapor is a physical change. The atoms are not rearranged. This kind of reaction is easy to reverse.\nChemical changes actually changes the chemical substance, and its characteristics and require much energy to occur. eg - hydrogen and oxygen combine to form water (H2O). these reactions are very hard to reverse. The atoms are rearranged. \nMarina.
208346
Strictly speaking, a chemical change occurs when the bonds between atoms are either made or broken (often both).  Bonds can be either covalent (electrons are shared), ionic (one or more electrons are given up by one or more atoms and given to another atom or atoms), or metallic.  Burning something is a chemical reaction.
51900
The human body comprises chemical compounds such as water, amino acids (proteins), fatty acids (lipids), nucleic acids (DNA/RNA), and carbohydrates (e.g. sugars). These compounds in turn consist of elements such as carbon, hydrogen, oxygen, nitrogen, and phosphorus, and may or may not contain minerals such as calcium, iron, and zinc. Minerals also ubiquitously occur in the form of salts and electrolytes. All of these chemical compounds and elements occur in various forms and combinations (e.g. hormones/vitamins, phospholipids, hydroxyapatite), both in the human body and in organisms (e.g. plants, animals) that humans eat.\n\nThe human body must necessarily comprise those elements that humans eat and absorb into the bloodstream. The digestive system, except in the unborn fetus, is the first step in helping to make the different chemical compounds and elements in food available for the trillions of cells of the body. In the digestive process of an average adult, about seven litres of liquid, known as digestive juices, exit the internal body and enter the lumen of the digestive tract. The digestive juices help break chemical bonds between ingested compounds as well as modulate the conformation and/or energetic state of the compounds/elements. Yet many compounds/elements are absorbed into the bloodstream unchanged, though the digestive process helps to release them from the matrix of the foods where they occur. Any unabsorbed matter is eliminated in the feces. Only a minimal amount of digestive juice is eliminated this way; the intestines reabsorb most of it otherwise the body would rapidly dehydrate (hence the devastating effects of persistent diarrhea).\n\nStudy in this field must take into careful account the state of the body before ingestion and after digestion as well as the chemical content of both the food and the waste. The specific types of compounds and elements that are absorbed by the body can be determined by comparing the waste to the food. The effect that the absorbed matter has on the body can be determined by finding the difference between the pre-ingestion state and the post-digestion state. The effect may only be discernible after an extended period of time in which all food and ingestion must be exactly regulated and all waste must be analyzed. The number of variables (e.g. 'confounding factors') involved in this type of experimentation is very high. This makes scientifically valid nutritional study very time-consuming and expensive, which accounts for why a proper science of human nutrition is rather new.\n\nIn general, eating a variety of fresh, whole (unprocessed) foods has proven hormonally and metabolically favourable compared to eating a monotonous diet based on processed foods. In particular, fresh, whole foods provide higher amounts and a more favourable balance of essential and vital nutrients per unit of energy, resulting in better management of cell growth, maintenance, and mitosis (cell division) as well as of appetite and energy balance. A generally more regular eating pattern (e.g. eating medium-sized meals every 3 to 4 hours) has also proven more hormonally and metabolically favourable than infrequent, haphazard food intake.\n\nVitamins give you a complement among all the nutrients your body requires. It is not advisable at all to substitute entirely your meals with vitamins and dietary or food supplements.  I recommend you to look for a nutritional advisor and discuss in which way you can adjust your meals, having all the necessary elements your body needs, plus, eating only what you like.
557822
Looks like it's more of a cleaning outthan anything. I'd assume once you cleaned out your system your digestion would be a lot smoother. Prolly helps with metabolism too. looks worth trying if you're able to. Wouldn't stay on it longr than the week though.
975987
The small intestine is where the most chemical digestion takes place; peptides are degraded into amino acids; lipids (fats) are degraded into fatty acids and glycerol; and carbohydrates are degraded into simple sugars (e.g., glucose).
527144
Might be the hydrochloric acid the stomach produces.
855869
primary,secondary, tertiary,quaternary.\n\na change in ph results in a change in the concentration of OH and HYDROGEN ions.the high content of hydrogen ions make proteins to coagulate
609384
the food you eat has a large variety of chemical features, so you need a lot of different enzymes to break down all the different types of chemical structures that your food contains so your body can effectively process it.
89534
Salivary amylase catalyses the breakdown of starch (and glycogen) into maltose.\nThe process of digestion in the mouth is only brief because the masticated food is soon swallowed into the stomach.\nThe hydrochloric acid in the stomach stops any further digestion of starch.\nOnce the stomach contents enter the small intestine, pancreatic juices both neutralise the stomach acid and supply more enzyme - pancreatic amylase.\nSo the digestion of starch (and glycogen) is completed in the small intestine.
673308
sucking on pasta is a chemical change, boiling it in water is a purely physical change though...
154370
cutting\nslicing\ndicing\nmixing\nchopping\nwhipping\ngrating\nshredding\nkneading\ncombining\npureing\nblending\n\nto name a few\n\nanything that changes the food is "processing."
904434
IN A NUTSHELL-THEY REQUIRE DIFFERENT ENZYMES FOR DIGESTION AND DIFFERENT GASTRO-PH REQUIREMENT.\n \nHERE IS A MORE IN-DEPTH EXPLANATION IF YOU ARE UP TO THE LONG READ.\n\nIf protein is eaten with too many carbohydrates (bread, crackers, potato, rice, pasta) or with fruit (sugar), digestion is severely compromised. Consequently, the body becomes a breeding ground for bacteria in the gastro-intestinal tract. Moreover, such a combination contributes to higher levels of cholesterol. Eating Proteins with carbohydrates is a major cause of cholesterol problems. Perhaps one reason why cow's milk causes so many allergies is that it is a protein and carbohydrate (sugar) combination.\n\n\nSeparating these two types of food is one of the first steps to being free of allergies. The digestion of protein and carbohydrates are physiologically separate and conflicting functions. The protein is digested in an acid medium which means that the enzymes function in an acid environment. Combining protein and carbohydrates (digested in an alkaline medium) impairs the proper digestion of one or the other food. Historical and current observations show that the body opts for the digestion of the carbohydrates if both foods are present, perhaps after the principle of a "path of least resistance." Or the body opts for the digestion of the carbohydrates in mixed meals to meet immediate energy and survival needs. In this way, the body will function effectively and will be able to obtain proteins at another time.\n\n\nWhen carbohydrates (starches) are eaten, the digestive system sends forth alkaline or neutral gastric juices, such as amylase which is most efficient at an alkaline pH of 7.1 - 7.2. However, when proteins are eaten, the digestive system sends out acid gastric juices at a pH of 3, for example. If these food groups are eaten simultaneously, the gastric juices (if both are provided) cancel each other out and poor digestion results. Anything that inhibits digestion is an enemy of health. But the body is concerned with conservation of energy and does not send for conflicting digestive enzymes. Protein digestive enzymes are much more costly to the body to manufacture. If both protein and carbohydrate are eaten simultaneously, the body may only respond to the easier carbohydrate digestive process and let the protein pass through. This results in poor absorption of amino acids and poisoning of the body due to putrefying/decaying protein (i.e. rotting meat in the intestines). When a food is chewed, the ptylin or amylase enzymes in the saliva begin processing the carbohydrates.\n\n\nIf carbohydrates are prevalent, a signal is sent via the hypothalamus to the pancreas to produce more alkaline amylase enzymes to further process carbohydrate food. If protein is prevalent, the signal is sent to the pancreas to produce more protease enzymes to process the protein. The pancreas mass-produces one or the other enzyme at a time. if both proteins and carbohydrates are eaten simultaneously. The pancreas opts for pancreatic amylase (the easier enzyme to produce) for the digestion of carbohydrates and neglects the protein digestion. Usually, some carbohydrates will be eaten in any protein meal, because the vegetables so strongly advocated as absolutely essential in a protein meal contain carbohydrates. We can also add a tortilla or a few croutons to the meal and not exceed the body's ability to digest the protein. If the carbohydrates are less than 18% by volume, the body can still recognize the focus of the meal as protein and digest it accordingly. Some protein foods and some vegetables become starches when cooked for an extended period of time or at high temperatures, particularly above 200° F. Those foods include beans, corn and peas. Although dry or sprouted beans and peas are proteins, they become starches when cooked. Always have vegetables with a protein meal. In fact, if you wish to live long and vitally, you will have organic vegetables w
1152421
Yes. It is generally the water-base fruits and veggies, like celery, cucumbers, and watermelon. Also, the colder they are when you eat them, the more calories your body expends while digesting.
653131
see, its very simple...\n\nthe sight/thought/hearing of food causes the excretion of all the digestive enzymes from the walls of stomach and various endocrine and exocrine glands... in the stomach the concentrated acids also becomes to accumulate, but sice u are not providing the enzymes with any kind of substrate to be acted upon (as u say ur starving), they mix up and form a kind of liquid in which u have all the components acids, bases, free ions etc... the reaction between the various chemicals causes a pressure change and u burp, which is most of the times followed by a feeling of nausea and sometimes vomit...
819615
Hydrochloric acid has several functions during digestion.  Gastric acid has a pH of around 2.0, which is highly acidic.  Since proteins have a narrow pH threshhold, gastric acid denatures them and exposes peptide bonds for proteolysis.  \n\nThe real work of breaking the peptide bonds is done by pepsin though.  However, since pepsin targets proteins and there are many proteins in body that we don't want pepsin to break up, pepsin has to be produced and transported around in the form of it's inactive precursor, pepsinogen.  Once the pepsinogen encounters the HCl in the stomach, it is activated into pepsin and proteolysis can occur.  \n\nStomach acid is also useful in killing any bacteria that have entered the stomach through the esophagus and keeping the beneficial bacteria in the colon from migrating into the small intestine and causing problems.