Questions tagged [nutrition]

The study of the appropriate provisions required to sustain life in an organism or the provisions themselves.

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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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How to quantify quality of vegetables and fruits?

I am interested in knowing if there have been studies in quantifying the quality of vegetables and fruits. By simple examination, it is possible for us to identify if a particular vegetable is 'spoilt'...
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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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Glycogen replenishment after exercise

In the body, the liver holds between 90-110 grams of glycogen in storage, while skeletal muscle storage makes up another 400 grams. If a person exercises and depletes both stores, when a carbohydrate ...
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Is biotin a hapten? If so, how does it work as a hapten in the human body?

https://en.wikipedia.org/wiki/Hapten Hapten's aren't synonymous with allergens. It is defined as a foreign molecule that can bind to an antibody but does not evoke an immune response unless combined ...
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171 views

Why do plants produce and store both amylose and amylopectin?

Since both forms of starch has its primary purpose of storing glucose and hence releasing energy, why are there 2 variations of this sugar? Is it possible for an organism to contain/depend only on 1 ...
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43 views

What nutrition do flies find in feces?

How are flies able to extract nutrition in feces when the originating animal wasn't able to? What makes flies more capable?
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99 views

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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Would canines that consume the stomach of ruminant prey animals benefit from any of the bacteria and enzymes present in the rumen?

This question is inspired by the growth in popularity of raw diets for pet dogs. Green tripe is a common addition to these diets, with many claims of probiotic benefits. Here's an example from a ...
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39 views

On vs. off-plant ripening: which one yields a more nutritious fruit?

Many fruits may ripen either when attached to the plant, or once it is detached from the plant. Which option yields a more nutritious fruit? In other words, if one picks a fruit when it is still ...
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Could felines live without meat?

Algae are a source of taurine and mushrooms are a source of vitamin D3. Both also contain high protein. So, it seems possible to feed a cat or other felines without any meat. Are there any concerns to ...
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200 views

Zinc and brewer's yeast

I'm hoping for some information relating to yeast nutrition (specifically Saccharomyces cerevisea) in beer fermentation. Zinc is well-known to be necessary for yeast cultures to perform successful ...
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87 views

What kinds of fish tend to have a rapid death after being caught?

I am asking this question because I am trying to make my diet less cruelty-oriented, for this reason this question can be related to trolley problem since I am coping with an ethical problem trying to ...
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46 views

Which lipoprotein has the highest protein content?

I know that HDLs have the highest protein/lipid ratio but know that the HDLs are very small molecules too and I couldn’t find the exact answer for this question. I mean, by amounts which of these ...
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Which white beans have phosphatidylserine?

Many articles online say that plant foods are poor sources of phosphatidylserine, except for white beans, which have 107 mg per 100 g.¹ ² ⁴ Honestly though, I think they might just be repeating a ...
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37 views

sweet receptor's affect on insulin release

So I understand the basics of how the body releases insulin to keep blood glucose levels in check and (loosely) that higher insulin levels can lead to more (or at a faster rate) glucose being stored ...
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46 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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72 views

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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219 views

fast metabolism and law of conservation of energy

Usually if person take more calories with food than he spends, he is gaining weight. But if he has fast metabolism, his weight stays the same. Where these calories go? Maybe food is not completely ...
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435 views

How can plants be grown in hydroponics, and yet not handle too much water in soil?

It's pretty much common knowledge that plants planted in pots or soil that doesn't have good drainage can't be watered too much, or they'll "drown". Regardless of what actually happens, experience ...
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64 views

Hormones and body mass

I was wondering how some animals (bulls, elephants etc.) become so large by only eating grass or plant based material and why some humans can build large amounts of muscle and mass without a proper ...
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How much myrosinase do mustard sprouts contain?

It is known that ground mustard seeds contain active myrosinase, but what about soaked or sprouted mustard seeds?
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22 views

Why is it (allegedly) dangerous to feed ducks with breadcrumbs and pieces of bread?

I used to go down to the local lake all the time with leftover bread and throw little pieces of it to the hungry duckies, who very eagerly fetched it and ate it while happily quacking away. I thought ...
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64 views

Can microbes become “overweight”?

Just out of some weird thoughts, can a microbe (any single-celled organisms, accepting answers for both prokaryotes and eukaryotes) ingest too much food (e.g. via absorbing too much involuntarily ...
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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)
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How many types of bacteria?

Bacteria are classifed on the base of food. Two types of bacteria, autotrophic and heterotrophic bacteria. Autotrophic bacteria that prepare own food or energy. Heterotrophic which cannot prepare own ...
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What is the percentage of food that goes to a lamb fetus?

Does any one know the percentage of food eaten by a pregnant ewe that goes to the lamb fetus? Specifically how much does the mother take for her body from every one kilo of food and how much does ...
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Why doesn't the soil get depleted after repeated clearing of vegetation?

In my neighborhood, there is a hillside owned and maintained by the local municipality. The hillside is generally overgrown with vegetation. Work crews clear out the vegetation multiple times ...
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39 views

Why do we need to diversify our food sources to live healthy, where other animals live happy on one source?

We read about eating different food to get all vitamins and minerals our body need, and often you find people fail to get the daily amount of a certain thing. I wonder why we humans need to do this ...
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What is the consensus, if it exists, on the (absence of) biological effects of artificial sweeteners?

I tried to Google (and PubMed) the question, but it seems to be fairly polarized debate and there does not seem to be a consensus as to whether sweeteners like asparatme, acesulfame etc. have ...
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Carbohydrate diet and dental health

I read that human started carbohydrates rich diet after adopting agriculture before that meat was main energy source which has comparatively less carbohydrate. High carbohydrate started destroying ...
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73 views

What is the most readily usable form of nutrients/energy source for heterotrophic microorganism in general?

Consider a nutritious mixture containing abundant soluble sugars, soluble lipids and soluble protein etc. Would heterotrophic microbes preferentially use sugars first > lipids > proteins > insoluble ...
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39 views

To what extent does the cooking time impact the nutritional content when boiling potatoes?

I wonder to what extent the cooking time impacts the nutritional content when boiling unpeeled potatoes with unsalted water. http://www.livestrong.com/article/340060-does-boiling-potatoes-reduce-...
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80 views

Cell energy consumption and food intake

I am wondering if each cell in human body starts consuming ten percent more energy, how much food one has to consume compared to normal intake?
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60 views

How do people measure how many calories or proteins/fats/сarbohydrates are in some food?

How is the composition (in fats, proteins or carbohydrates) of a certain food estimated and how is the amount of calories provided by the food calculated?