Questions tagged [digestion]

The physiological process of breaking down food into its constituent parts to provide nutrition for the body.

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Does pepsin digest plant protein?

This may sound trivial, but... Protein is sourced from plants and animals. Pepsin and HCl digest meat (animal protein). Does pepsin also digest plant-based proteins? I took a look at few articles ...
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Would modifying the human microbiome to digest cellulose be worth it? [closed]

I've read that cellulose has a lot of calories that go unused. I was wondering how practical it would be to incorporate a bacteria capable of suggesting cellulose into the human gut. I would say that ...
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Raw food diet digestion

I haven't really paid attention to the raw food diet and the claims of its supporters until now. A passage from this website says: The basic premise behind preparing raw food is not to cook food ...
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If humans had cellulase would they be able to digest grass?

Cellulase is an enzyme capable of breaking cellulose. If humans were able to produce cellulase in our stomach would we be able to digest grass? If not, what more things would we need in order to ...
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Which enzyme curdles milk in human infants? [duplicate]

Following, this question - Do humans produce rennin? Rennin does not exist. And What inactivates pepsin in infants? Rennin exist. What do I know is- Rennin is found in calves and acts on milk to ...
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Can Fluoride be absorbed into the blood from within the mouth without swallowing?

I'm having a discussion with somebody regarding Fluoride usage. I told him that even if he doesn't like the idea of ingesting it, brushing and spitting it out will do you no harm. He then said this: ...
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Does starch need to be cooked?

Does starch need to be cooked for human digestion ? Is the answer different for different starches; potato , wheat, corn, etc ?
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Is starch and glycogen digestion intra or extracellular?

Do humans have the enzyme for starch intracellular digestion? Also, do plants have the ability to digest Glycogen? Intra or extracellular, or both?
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Chewing and weight loss/gain

I have a burning question. I have read many articles which say that chewing food properly, therefore longer, till you have a liquid-like texture, is causing you to eat less calories. However, it ...
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Energy cost of chewing vs production of enzymes

Consider a hypothetical case that you ingest a piece of starch. Which is more costly energetically 1) chewing + reduced amount of enzymes production needed or 2) sole production of all the enzymes for ...
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Carbohydrates in acidic stomach

How does the acidic environment in the stomach affect carbohydrate and fast digestion? Does it aid, impede or remain neutral in their digestive process? Or do the carbohydrates, fats and proteins ...
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Does hunger necessarily mean that we should eat?

People feel hunger sooner after they eat food that consists mostly of carbohydrates. For example, if someone eats a good portion of rice then most likely they will be hungry after a couple of hours. ...
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Is human blood useful as food?

Lacking other resources, could a healthy adult slit his wrist to feed a starving child with his blood? Would it be nutritional and would a starving dehydrated child eat it?
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Human Digestion of Cellulose?

Most animals can digest the cellulose in grass because of the anaerobic bacteria called Fibrobacter succinogenes living in their rumen (gut). The bacteria produces the enzyme cellulase and is ...
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Why is secretin sensitive to acid?

My textbook says, secretin secretion is triggered by the presence of acidic chyme in intestine. But why is secretin sensitive to acidic environment? I checked the wikipedia page of secretin and found ...
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Why do we have bacteria in our alimentary canal? [closed]

Our alimentary canal contains lots of bacteria. Most of these are found in the small intestine and large intestine. Can you a give a few reasons why is it a good thing to have bacteria in our ...
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Why is pollen used as a dietary supplement?

Sporopollenin is the hardest biological substance and can't be degraded by any know enzyme (my school textbook). Then why is pollen used as a dietary supplement if it can't be digested? Also, pollen ...
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Betaine HCl stomach pH

It seems betaine HCL is often recommended for those suffering from "low stomach acid" -- which, as I understand, is having too high stomach pH for proper digestion (especially for proteolysis via ...
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Can I dry digested protein sample over weekend in a vacuum concentrator?

I have digested with trypsin the tissue protein extract for mass spectrometry, and forgot to transfer the sample from the SpeedVac to the -80C freezer. As I did this on Friday, I can transfer the ...
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Digestion of milk in humans

The intial step in the digestion of milk in humans is carried out by which of the following enzymes? A) lipase. B) trypsin. C) rennin. D) pepsin. I'm confused between the C and D option. as it'...
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Is some of the energy of food lost during digestion?

I know that chemical energy of food is converted to heat energy to be used by the body in many metabolic reactions. Specifically, I know that the breaking down of bonds is what releases energy. Does ...
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How do bile salts affect lipase activity?

BACKGROUND: It is well known that bile salts are needed for emulsification of fats. It is then said that this increases the surface area for activity of pancreatic lipase, implying that bile salts ...
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Cholesterol and fatty acids role in bile? [closed]

The composition of gallbladder bile is 97% water, 0.7% bile salts, 0.2% bilirubin, 0.51% fats (cholesterol, fatty acids and lecithin)1. Bile's role is mainly help for digestion of lipids via bile ...
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How is chewing gum processed?

There is the common belief that Chewing gum takes 7 years to digest But is this actually true? Does it really stick to your intestines for 7 years, or is it processed like all foods, except it isn'...
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How Anopheles crop doesn't digest gametocytes of P. vivax?

Background According to my A-level textbook: When Anopheles mosquitoes inject their proboscises and suck up blood from human host of malaria agent, they suck all stages of malaria parasite present in ...
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Can you eat enough to make your stomach explode?

Background After eating a large meal last night, I noticed that my tummy had significantly enlarged. After that, I started wondering if eating too much could cause a stomach to explode. Could this ...
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Is aquafaba readily digestible?

I have always drained and tossed the water from canned beans. My understanding has been that the water that canned beans are soaked and cooked in contains raffinose, the gas-causing sugars that humans ...
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How does horse extract the energy to needs from a relatively small digestive system?

Recently I saw Inside nature's gaints episode on horse, and was fascinated about its internal organisation. And my question is that they have a very large lungs to accommodate, but a relatively ...
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Secondary/ Acquired lactose intolerance

Acquired lactose intolerance may occur due to a sudden and high intake of milk-based diets. Lactase is an inducible enzyme. So if lactase is an inducible enzyme then why increase intake of lactose is ...
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How does hydration affect digestion?

My textbook( biochemistry by Satyanarayana, 4th edition pg.no:166) says: The polysaccharides get hydrated during heating which is essential for their efficient digestion. (I think there is a typo ,...
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Digestion Enzymes in Carbohydrate Metabolism?

Digestion of carbohydrates is ending in small intestine with mainly disaccharidases. Isomaltose is broken down to 2 molecules of glucose by the enzyme called alpha dextrinase(oligo-1,6 glucosidase or ...
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What are the sites of nutrient digestion and absorption in the human GI tract? [closed]

Where does nutrient digestion and then absorption take place for different nutrients along the alimentary tract?
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Can we digest food as well as herbivores [duplicate]

I heard some guy say that we can't digest plant food as well as herbivores. Which seems weird to me seeing as how humans can survive without any nutrient deficiencies besides b12 on only plants but we ...
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When salivary amylase breaks down starch, are those substances tagged or destined for a particular use in the body [closed]

When salivary amylase breaks down starch, are those substances identified for a particular use in the body?
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Does food really give our bodies the energies that we have determined by burning them in the lab?

You are likely to have come across numbers like sugars 17kJ/g (4kcal/g) as the energy supposedly available to our bodies after eating. Yet these values have been determined using very artificial means,...
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What percentage of human excrement is toxic if ingested?

I have been considering food production, waste management and 3D food printing, particularly during space exploration. This led me to wonder if human excrement could be processed into raw materials ...
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Is there a link between digestion and nightmares?

A common belief is that eating too much before going to sleep can cause to have nightmares. In fact, I often experience it: I systematically have nightmares after eating too much in the evening. ...
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What are the consequences of drinking water with food?

Does drinking water with a meal release lesser energy/glucose into the blood stream due to a diluted digestive mixture ? For simplification : If a person eats 100 grams of cooked jasmine rice with no ...
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How does the human stomach handle a mix of digested and undigested food?

As I understand it, the stomach digests the bolus into chyme and then passes the latter on to the small intestine. This process takes between 40 minutes and a few hours. However, what happens when ...
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Is there a difference in how Gas is produced which determines if it becomes a burp or flatulence?

I know that some gases are heavier than air and in the case of a gas leak it's best to escape to higher ground, while some gases are lighter than air such as Helium. However unlike Helium I haven't ...
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How can birds disperse seeds when they are able to digest them?

I've just read in a book that birds' guts can digest almost all the consumed seeds with the exception of mistletoe and loranthus (which stays stuck on the branches). On the other hand, I know that the ...
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Would it be possible to eat things from another planet [closed]

Although at first glance my question is perhaps better suited for a space exploration or sci-fi forum I looked and felt this forum was more appropriate. What makes plants and animals edible and ...
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How does consumption of vinegar affect food chemistry?

For example: does consumption of vinegar somehow change digestion of flour (bread, cakes, pasta, puffs) ? May be there are some benefits to eat flour meal with vinegar ?
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Where do class 2 preservatives end up after digestion?

Do anybody know what happens to class 2 preservatives in general after they are digested - i.e details like weather they are absorbed into blood as simplest elements or excreted out or assimilated to ...
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Enzymes and Digestion

If biological enzymes (protease,amylase,lipase etc.) just speed up the reaction (in the digestion process), then what actually digests the food?? (I'm a secondary student)
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Is there evidence to suggest that nutrients in vitamin capsules are not as readily absorbed as the same nutrients in whole foods?

I recently fell ill with a cold, and began to take a vitamin C capsule each day to help my immune system. When I noticed no change in my condition, I began to incorporate an abundance of citrus into ...
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Can an emulsion enter a cell?

I've been tempted on cooking.stackexchange to answer a question, and I did, out of my mind. (In retrospect, I shouldn't have done so, based on my lack of citable resources.) I've heard that a water ...
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Does food continue to stay sequential once it is inside my body?

I may be very off on many scientific details here, but I'm always all ears. As far as I understand, any food that is eaten goes to the stomach, gets broken down even further into smaller food ...
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why is cellulase not found in animals? [closed]

As it is really beneficial for all organisms, why are animals, especially mammals (I don't know about other vertebrates) unable to synthesize cellulase enzyme in their body? Is it linked to some DNA ...
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Why do we get sleeply after we eat?

After we have eaten, we feel cold and sleepy. I think it's because the maximum blood supply is transferred towards the digestive system so that digestion is done, and therefore the brain to does not ...