Questions tagged [digestion]

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

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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
2k 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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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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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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47 views

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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Why do nattokinase and serratiopeptidase remain effective when given orally, but not insulin?

Why do nattokinase and serratiopeptidase not break down in the stomach and intestines? Article says that serratiopeptidase is absorbed in rats intestines after oral intake - https://iubmb....
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32 views

How do Apes get their Omega 3s in the wild given so few plant sources? Are they able to convert it to DHA?

Given so few plant sources(around 6-7) of ALA, how do Apes get ALA in the wild? Are they able to convert it into DHA in satisfactory amounts?
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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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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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Parasympathetic effects on digestive tract - motility versus absorption

The parasympathetic nervous system's purpose is often referred to as "rest and digest." As part of this purpose, parasympathetic innervation increases motility in the digestive tract to move ...
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Why do vertebrates have an oesophagus?

As far as I know, the oesophagus in vertebrates has no digestive or absorptive function. It is simply a conduit from the mouth to more distal parts of the gastrointestinal tract. Why have it at all, ...
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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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453 views

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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47 views

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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59 views

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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40 views

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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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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Which metazoans host anaerobes to aid in digestion? Do any host oxic digestive tracts?

Many metazoans (e.g., mammals, insects, earthworms) have anoxic digestive tracts that are colonized by anaerobic microbes that perform portions of digestion of food for the host. Some other metazoans ...
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45 views

Does animal based food contain molecules that behave like dietary fiber for humans?

I have read that dietary fiber is beneficial to human health in many ways, for example that it can help to reduce risk of colorectal cancer. However, when I look at nutrition labels on food it seems ...
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Is the “first pass effect” diminished more by some foods than others?

This effect and its considerations are fairly well known but it's never been clear to me whether it's a greater consideration with some types of food than others.
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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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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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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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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 ...