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Questions tagged [digestion]

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

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Why are prions in animal diets not destroyed by the digestive system?

According to CBC: Mad cow disease is the common name for a condition known technically as bovine spongiform encephalopathy, or BSE. [...] The only known source of mad cow disease is from animal-...
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Why is wombat excreta shaped like cubes?

I've heard that wombat excreta is cube shaped, but I don't understand how that can happen. Has anyone studied the phenomenon? What would the evolutionary pressure have been to cause this?
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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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Does freezing microorganisms such as probiotics kill them?

Does freezing microorganisms such as probiotics kill them? If not, what is the process that allows them to "come back to life" after the temperatures are increased? As an example, lets say you ...
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Do mosquitos excrete blood?

Since insects like mosquitos ingest only blood, and insects generally excrete their solid and liquid waste at the same time as frass, I was wondering: is mosquito defecation more like iron pellets or ...
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Does a walk after a meal help with digestion?

I am a bit confused with the notion that "walking after meals helps you in digestion ", Some say that it helps, whereas others oppose it. Can someone come up with a valid explanation for this?
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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 are triacylglycerols broken down before being absorbed?

So when dietary fats are in the small intestine, they are emulsified by bile salts in order for action by lipases to occur. Lipases degrade the triacylglycerols into monoacylglycerols, ...
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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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687 views

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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1answer
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Why does flatulence vary in temperature and smell?

Quite simply, why do some farts feel warmer than others? Some feel regular, while others feel like lava. What causes this? If there is no real temperature difference, why do I perceive some to be ...
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372 views

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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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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638 views

Where does all the food go?

Food goes in, excrement come out. This seems obvious. But it seems like the mass of the excrement is less than the one of the food. Most people I asked answered: "There's a difference because it's ...
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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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What happens to lactic acid I eat?

Let's say I drink some Kefir Milk, what happens to the lactic acid in the Kefir Milk that has entered my digestive system?
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564 views

Influence of eating at late night on sleep

I have often heard the saying that one shouldn't eat a mountain of food because blood will go to the stomach and it'll be difficult to sleep well because the stomach can't rest at night. I see that ...
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562 views

How do people digest fat after gall bladder removal surgery?

How do people digest fat after gallbladder removal surgery? How can they tolerate a high fat diet?
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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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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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Can reptiles digest grains?

As a caretaker of a turtle, I sometimes struggle understanding the logic behind the inclusion of corn, soybean, and wheat meals in reptile food, such ingredients seem truly aberrant from what a ...
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1answer
507 views

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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1answer
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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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1answer
123 views

Do sharks fart?

My son is 5 and I'm encouraging him to be curious and ask questions of the world around him. He asked if sharks fart and how does it smell? He feels that it would smell of fish and be disgusting. He ...
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Why do feces vary so little in color?

Why do feces vary in color so much less than the food they are results of? E.g. you may eat food of all kinds of different colors but the resulting feces will almost always be some shade of brown.
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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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796 views

Does eating bananas help digestion? [closed]

I don't know what I am asking is silly or not, but I have always heard that eating a banana after a meal helps in digestion. Some people says before food while others say after. Is it a fact or some ...
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1answer
801 views

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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102 views

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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408 views

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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1answer
477 views

Does adding milk to cereal make it harder for our body to absorb the vitamins and minerals from the cereal?

I add about 3/4 cups of Blue Diamond almond milk (unsweetened) every morning to a single serving of Cheerios. The milk contains filtered water, and I read that drinking water with food at the same ...
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1answer
256 views

Are the byproducts of mammalian digestion simply depleted versions of the food or liquid consumed?

When mammals consume food and digest it or drink fluids that are then filtered by their kidneys, are the waste products generated simply depleted versions of what they consumed? Are there other ...
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1answer
820 views

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 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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1answer
503 views

How does regurgitated food go to the 3rd stomach chamber instead of going to the 1st?

Ruminants are known for their regurgitation of food; the food goes through the 1st and 2nd stomach chambers, then returns to the oral cavity in cuds. The cuds then come back into the stomach, but this ...
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1answer
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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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1answer
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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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1answer
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How is bad garlic breath eliminated by swalllowing a bit of raw garlic?

Please bear with me, as I am just a poor physicist. I have learned how to make traditional pastourma from a recipe given by my late aunt Dora, which is like pastrami except with a very strong garlic ...
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118 views

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 the human gut work with other type of gut bacteria?

I was wondering if the human body would be capable of functioning with, say, cellulolytic bacteria in their gut (instead of or in addition of their current bacteria), like that of ruminants and if ...
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0answers
238 views

Plant vs animal protein digestibility?

The protein scoring methodologies ( https://en.wikipedia.org/wiki/Protein_Digestibility_Corrected_Amino_Acid_Score) rate plant proteins of a lower quality than animal proteins. Now I can understand ...
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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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1answer
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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 ...
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1answer
622 views

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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1answer
302 views

Is plastic just as good for you as corn?

To specify, I mean plain corn-on-the-cob, not anything processed like corn flakes. Since one of the main important functions of corn is that it's not digestible, and therefore helps with digestion by ...
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2answers
457 views

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 carbs and fats leave the stomach (...
2
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1answer
94 views

Why does drinking milk lead to increased fractures?

Milk has always been associated with strong bones due to the high amount of protein and calcium in it. Yet reading it up on wikipedia, A study published in The BMJ that followed more than 45,000 ...
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1answer
144 views

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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1answer
37 views

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 ...