Questions tagged [digestion]

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

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14 views

How are proteins reused in the body?

Part of what we eat are proteins, and our body is in part build of proteins. Are the proteins of the body build based on proteins in food at all? Are proteins in food directly reused in the body, or ...
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What happens when a human ingests a large meal, and after a short time follows it up with a large amount of indigestible carbs?

A human eats a large meal and indigestible carbs (IC) with such a timing that the IC arrive to the small intestine when it is already full and busy breaking down and absorbing the meal. What would ...
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Is brewer's yeast a good source of protein for humans?

I read that brewer's yeast protein is not a "real protein" and is not usable by non-ruminants. Is that true? If yes, how can I know what kind of protein is good for humans (especially athletes)
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Do we excrete waste in same order of food intake?

Obviously I do not expect we poop out molecule by molecule in exact order. All I am asking is, is it possible for us to pass stool's of today's food before we poop yesterday's food. Does our GI tract ...
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Why are nutrients from food absorbed more efficiently? [duplicate]

It seems to be common knowledge that micronutrients such as vitamins are more easily absorbed by your body when in your diet versus supplements such as pills. I am wondering what the reasons for this ...
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Cellulase Sample Digestion Protocol?

Is there an effective way to use cellulase(s) and/or lignase(s) to remove unwanted plant debris from a sample? I'm working with a series of fresh water grab samples for environmental assessment. The ...
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How can we digest lactose even though it has Beta glycosidic linkages?

I have Read that we cannot digest cellulose because we do not have enzymes to digest Beta glycosidic linkages in Cellulose Then how is it that we have an enzyme called Lactase to digest the Beta ...
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Human evolutionary innovation for rapidly restoring glycogen, and link to cardiovascular disease?

I'm a physicist, not a biologist, but I'm interested in human evolution and its link to the physiology of endurance sports. Circa August 2019, I read an article in the newspaper whose contents I'll ...
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Cormorant vs eel possible feeding?

I recently saw a cormorant at our local park. It dove pretty quickly, soon after it came up struggling with a large green eel. The thick 2' eel seemed quite determined to escape by thrashing and even ...
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Why is sugar absorbed very fast into the blood stream?

Recently, I heard from a pregnant person I know that immediately after she eats something sugary/sweet, the baby starts kicking and moving around, as if reacting to the sugar. She told me (...
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77 views

What are the differences between mammal and insect digestion of cellulose?

I know that digestion of cellulose is difficult in mammals and requires a lot of steps. But I am fascinated by the idea of one day achieving human digestion of cellulose. Which got me thinking about ...
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Are casein proteins in UHT milk digestable for infants or toddlers?

As a novice cheesemaker, I have read that Ultra High Temperature prosessed milk is unsuitable for cheesemaking, as casein proteins are denatured and cannot be curdled with rennet. I have verified that ...
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Why are sugars in whole fruits not digested the same way sugars in juice are?

In this paper of the WHO, it is claimed that we should limit our consumption of free sugars: WHO recommends a reduced intake of free sugars throughout the lifecourse. [...] Free sugars include ...
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How does the stomach handle continuous eating?

In biology class, we learned this familiar story: Food enters the stomach, the stomach churns it with acid and enzymes, and then, somehow, the stomach senses when the stew is ready and releases it ...
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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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Is sugar absorbed into the bloodstream through the walls of the mouth?

If you let a piece of candy melt in your mouth, but did not swallow it, would the sugar be absorbed through the walls of your mouth?
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How is fructose absorbed into the body

I’m finding contradicting methods of Fructose transfer to blood page no 264(10)One of which saYs fructose is absorbed by simple diffusion And another sources like this say that fructose is ...
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221 views

How much does calcium reduce iron absorption?

Generally calcium inhibits the absorption of iron, but to what extent? One atom of calcium will not block 100% of iron absorption, that clearly isn't feasible. On the other hand, if someone ate 10 ...
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Why are Chloride Anions necessary for gastric acid functioning?

Why do parietal cells of the gastric mucosa release Chloride anions along the H+-ions, which are pumped into the lumen by the proton-pump. Wouldn't the presence of protons alone be enough to denature ...
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Which major salivary gland secretes maximum amount of salivary amylase and which one secretes maximum amount of Saliva

Actually I was studying about digestion and got this confusion about which gland(Parotid or Sub-mandibulary) secretes maximum amount of saliva and which one maximum amount of Salivary Amylase. Also,...
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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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How does the digestive system determine what to absorb [as nutrients] into the bloodstream?

If you put an egg into a sausage machine it will try to make sausages out of it because that's its job. Does the digestive system attempt to digest everything it receives? Furthermore, does it attempt ...
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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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Is gut bacteria Succinivibrionaceae's low methanogenesis understood well enough for GM of cattle gut bacteria to be considered?

After watching the Periodic Table of Videos episode linked in this question I watched the episode Wallabies and Methane where Sir Poliakoff says (a bit after 02:00):...
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Could a mammal convert ingested dissolved CO2 to usable energy?

I'm trying to find out if it's possible that a mammal could orally ingest dissolved CO2 and convert it to energy for body heat, organ function, etc. Unfortunately, most of the scientific sources I've ...
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Micelles Sticking Together

I have a quick question regarding micelles. I have tried googling the answer but can't seem to find the answer. The question is, during digestion lipids are emulsified into micelles in order to ...
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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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How cells determine how many enzymes are needed for digestion

How do pancreatic cells, epithelial cells of the stomach and intestinal epithelium cells determine the right amount of enzymes for digesting carbohydrates, proteins, fats? How does the pancreas ...
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Apolipoprotein B48 and fat storage

Can chylomicrons formed in the intestine, with apolipoprotein B48, transport lipids to adipose cells for storage?
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What is the difference between pseudorumination and coprophily? [closed]

Can someone please explain me difference between these two terms. any help is appreciated.
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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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Can humans derive any nutrition from eating the bones of animals?

Bones contain many nutrients like Calcium and phosphorus. And I'd take a guess that some kind of bones like bones of a chicken(hollow) aren't dense enough to be much of a problem during digestion. ...
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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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How exactly is casein digested?

I mean it seems first step is rennin or pepsin digestion in stomach - then what happens with remaining peptides? I am interested in the whole process from casein to amino acids. Is there brush border ...
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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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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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Microbiome Context for Amino Acid Essentials and Non-Essentials

Given what we are now learning about the diverse mix and variance of microbiomes (aka bacterias via human gut project), is it possible that synthesis of aminos can be done by specific bacteria and ...
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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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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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720 views

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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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 carbs and fats leave the stomach (...
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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?