Questions tagged [digestion]

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

Filter by
Sorted by
Tagged with
0
votes
1answer
32 views

What do spider digestive fluids look like?

What is the general appearance of the fluids that spiders use to digest their prey before they ingest it into the body?
10
votes
1answer
113 views

Why aren't the antibodies in the mother's milk digested by the infant's digestive system?

Why aren't the antibodies in the mother's milk digested by the infant's digestive system? Enzymes like pepsin have been found to be present in infant's digestive system(1). Though the pH in the ...
2
votes
0answers
33 views

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....
0
votes
1answer
79 views

Do humans emit more carbon through respiration or defecation?

Where does most of the carbon we ingest go? I understand that a large amount is exhaled as carbon dioxide, but what percent is defecated (and theoretically deposited in the ground)?
1
vote
0answers
60 views

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, ...
2
votes
0answers
31 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?
0
votes
0answers
44 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 ...
0
votes
0answers
44 views

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.
5
votes
1answer
113 views

Relationship between immunologic response to specific gluten epitopes and clinical antibody testing

Celiac disease is understood to be an immune response to certain proteins which occur in a group of cereals; most commonly they are glutens (wheat), secalins (rye) and hordeins (barley). A clinical ...
2
votes
1answer
87 views

How are proteins reused in the body? [duplicate]

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 ...
0
votes
1answer
59 views

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 ...
0
votes
0answers
37 views

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)
-1
votes
1answer
70 views

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 ...
1
vote
0answers
27 views

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 ...
1
vote
0answers
18 views

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 ...
1
vote
0answers
344 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 ...
5
votes
1answer
146 views

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 ...
0
votes
0answers
47 views

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 ...
7
votes
1answer
629 views

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 (...
1
vote
1answer
126 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 ...
1
vote
1answer
212 views

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 ...
21
votes
3answers
6k views

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 ...
8
votes
2answers
136 views

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 ...
2
votes
2answers
106 views

What allows grass eaters to digest cellulose?

Scientists are saying that it was a small step for the Panda to move from a meat diet to a grass diet. The article only refers to differences in the Panda's skull, presumably for better chewing. I've ...
37
votes
1answer
5k views

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-...
0
votes
2answers
1k views

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?
2
votes
1answer
70 views

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 ...
2
votes
1answer
238 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 ...
0
votes
1answer
72 views

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 ...
5
votes
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 ...
0
votes
1answer
124 views

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 ...
19
votes
2answers
5k views

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?
2
votes
0answers
87 views

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):...
0
votes
3answers
84 views

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 ...
0
votes
1answer
23 views

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 ...
7
votes
1answer
117 views

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 ...
1
vote
1answer
96 views

Apolipoprotein B48 and fat storage

Can chylomicrons formed in the intestine, with apolipoprotein B48, transport lipids to adipose cells for storage?
-2
votes
1answer
109 views

What is the difference between pseudorumination and coprophily? [closed]

Can someone please explain me difference between these two terms. any help is appreciated.
3
votes
0answers
41 views

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 ...
0
votes
0answers
24 views

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. ...
2
votes
1answer
101 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 ...
1
vote
1answer
3k views

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 ...
10
votes
1answer
447 views

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 ...
4
votes
1answer
86 views

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 ...
1
vote
1answer
61 views

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 ...
3
votes
0answers
270 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 ...
0
votes
1answer
907 views

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 ...
0
votes
1answer
809 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 ...
1
vote
0answers
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 ...
4
votes
1answer
1k views

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 ...