Questions tagged [nutrition]

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

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tools and techniques for determining nutrient status in plants

I am interested in tools and techniques, both commercial and academic, developed for determining nutrient status and identifying limiting nutrients in growing plants. My specific interest is in ...
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Why is the retention of ability to synthesize non essential amino acids of negative survival value?

In my textbook "Harper's illustrated biochemistry" chapter 27 it is written that The existence of nutritional requirements suggests that dependence on an external source of a specific ...
Lakshya Kumar Singh's user avatar
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If protein is mostly used by the body for purposes other than extraction of energy, why are calories from protein relevant?

Non-biologist speaking here. As you can probably see from the title, I'm having trouble wrapping my head around concepts related to the body's energy balance amd the role of macronutrients. Let me ...
ilovemaths's user avatar
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How is it known that there are only three macronutrients: proteins carbohydrates and lipids?

It is stated here that in human nutrition, micronutrients are nutrients required generally in less than 100 mg daily quantities whereas macronutrients are required in gram quantities. It is widely ...
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Is it possible to live without iodine? (sea plants, seaweed or fish?)

I’ve come across a few other people asking this question on different forums such as on Quora, and Reddit… With my current understanding, we evolved from sea creatures which is why we still need ...
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If split peas are good for health, why didn't evolution favour humans liking split peas?

Split peas, being legumes, are a source of food unanimously considered as healthy. My question is why didn't evolution favour humans that liked the taste of split peas? And/or maybe that could eat ...
FluidMechanics Potential Flows's user avatar
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Searching for reference regarding the impact of famine on a woman's grandchildren

I was once told that if a woman experiences a famine, her grandchildren will show epigenetic changes because the egg that the intervening mother came from also experienced the famine. In other words, ...
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What percentage of Lithium compounds pass the blood brain boundary?

I've been doing some research on lithium. Lithium is used in psychiatry as a medicine for mania and bipolar. This is generally a high dosage of lithium carbonate, with around 300mg of elemental ...
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Is it viable to make liquid potassium ferilizer through dissolving very small amounts of potassium chloride in water

I wasn't able to find fertiliser online that was simply potassium chloride and I didnt want to source my potassium chloride solution from potassium sulphate or other general NPK fertilisers for my ...
Malhar Kookada's user avatar
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Iron absorption and oxidative stress

Fe2+ is more bioavailable than Fe3+, so it's absorbed more quickly. I read that, for this reason, Fe2+ doesn't give enough time to the organism to bind it to a protein then it stays longer in a ...
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Human Fat Adipose Tissue: Maximum Energy Transferred out per Day?

The article "A limit on the energy transfer rate from the human fat store in hypophagia" states that subjects with moderate activity levels are found to have a limit on maximum energy ...
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Estimating Weight of Human Skeletal Muscle?

Is there a way to measure the weight of skeletal muscle? I understand body fat and lean body mass can be measured by: skin fold calipers, electrical impedance, table lookup based on formula of weight,...
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Through what mechanism does ingesting Saturated Fat (but not Mono unsaturated Fat/PUFA) increase Serum Cholesterol.?

I know that the saturated fats you ingest is broken down in the intestines by the bile acids from liver and then re synthesized as triglycerides after crossing the enterocytes. Then these ...
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Converting microequivalents per liter to mg for sodium?

I read that a normal blood sodium level is between 135 and 145 milliequivalents per liter (mEq/L). Hyponatremia occurs when the sodium in your blood falls below 135 mEq/L. How do I convert mEq/L to a ...
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Glycemic Index and AUC Curve: why do two different foods have differing numbers?

The AUC Glucose/Blood Level curve Integral (area under curve) is used to calculate the Glycemic Index of certain foods. I have a question on why two sample foods with the same mass of carbohydrates ...
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Human Body's rate of conversion of carbs, protein and fat into energy?

I understanding there are some complicated processes, but I'm interested in generally how fast the body converts certain chemicals into energy and the period of time this conversion occurs. I'm ...
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Calculating the Glycemic Index using an AUC Glucose/Blood curve?

Does anyone know the mathematics to calculate the Glycemic Index using a AUC Glucose/Blood curve? Is there an article documenting the process? I understand that algebra and integral calculus is ...
Nick's user avatar
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Glycemic Index and two-hour blood glucose response curve (AUC)? Where are the AUC charts?

I understand the "Glycemic Index" (GI) of foods is calculated using the area under a 2-hour glucose/blood response curve (AUC) after a 24 hour fast and consuming carbohydrates. Therefore a ...
Nick's user avatar
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Special food for big cat cubs?

For house cat kittens there is special 'kitten food', containing more nutrients than normal cat food in order to compensate for the fact that at pretty much any time of the day kittens spend a ...
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Do the neurogenic chemicals in mushrooms get transmitted to milk?

In a recent video by SciShow they discussed several studies showing that several compounds in lion's mane mushrooms encourage neuron growth. Do we know if these chemicals get passed into milk if a ...
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Does the human body need fat for other uses than to cover essential acid requirements?

Linoleic acid and alpha linoleic acid are the two essential fatty acids, from which other fatty acids can be synthesized internally. See for example here: Essential fatty acids. Given that the ...
CuriousIndeed's user avatar
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Do cochineals ("scale bugs") form aluminium complexes themselves? Where do they get such large quantities so quickly and how do they handle it safely?

Wikipedia's Carmine begins: Carmine (/ˈkɑːrmən, ˈkɑːrmaɪn/) – also called cochineal (for the insect from which it is extracted), cochineal extract, crimson lake, or carmine lake – is a pigment of a ...
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Is it possible for prion-infected meat to be processed safely (such as in Soylent Green) and still provide some form of nutrition?

I watched Soylent Green again today, and it's clear that our understanding of the health effects from cannibalism have improved since filming. Since then, we have now already experienced first-hand a ...
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Why isn't pure animal fat appetizing to humans? [closed]

When eating beef or lamb, humans almost invariably trim away the gristle. Tastes are a bit more varied with poultry and pork but, there too, most people don't like to eat pure animal fat. (Although ...
David E Speyer's user avatar
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What happens to quality of breast milk when twins of two different sexes are born?

It says here in Scientific American Mother's milk may be the first food, but it is not created equal. In humans and other mammals, researchers have found that milk composition changes depending on ...
Profile name's user avatar
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Vitamin B12 deficiency Megaloblastic anemic

I have two doubts regarding Megaloblastic anemia which shakes my mind (1) first is- I know that vitamin B12 is required for thymidine synthesis which is further required for DNA synthesis and so if ...
Rahul Dhillon's user avatar
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How do obligate carnivores not have nutrient deficiencies?

I know that if a human eats just meat without plants, they develop issues like scurvy. If my understanding of it is correct that there are nutrients not found in meat, then how do obligate carnivores ...
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Is chloride necessary for animals?

Of the twelve well-known atomic constituents of our body eleven elements have specific properties obviously relevant to their rôle, making them indispensable. Oxygen (electronegativity and valence), ...
Incnis Mrsi's user avatar
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Would the amino acid profile of lab-grown human meat perfectly match the dietary nutritional amino acid requirements for humans?

Whey protein is the food which has the most ideal (yet not perfect) amino acid profile for humans, whereas gelatin for example has a very poor and incomplete amino acid profile for humans. Would human ...
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Does alcohol really helps to get substances get faster into the bloodstream? [closed]

I saw the video where Arnold Schwarzenegger cooks some protein cocktail and adds Austrian Schnapps to the mix, saying that it's to make everything get faster to the blood. Is it true or some kind of a ...
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Difference between diffusion and osmosis

Osmosis in plants so called diffusion too. Need to understand the difference between osmosis and diffusion Because this both process transport molecules from region of higher concentration to region ...
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Plants with nutritional requirements similar to Cannabis

What are some short plants that preferably could be grown indoor which have similar nutritional requirements (in terms of N-P-K ratio, doses etc.) as Cannabis? The purpose of this is testing a mineral ...
Schmalhausen's user avatar
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Why is the nutritive value of grass to humans compared to alternatives?

Cows thrive on eating large amounts of grass. That's because they have specialized digestive processes, such as chewing a cud that maximizes the value of grass to her. Humans who don't have these ...
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Does the harvesting time of broccoli sprouts change their glucoraphanin content and sulforaphane formation capacity?

Does anybody know if the harvesting time affects glucoraphanin content and sulforaphane formation of broccoli sprouts? Do they also get affected by light exposure or lack of it?
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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 ...
K. Stonewall's user avatar
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How much fat can the body absorb? Implications for daily fat distribution

This question is named analogous to this research: How much protein can the body use in a single meal for muscle-building? Implications for daily protein distribution http://ncbi.nlm.nih.gov/pmc/...
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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)?
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What is the cause of a protuberant belly in kwashiorkor?

Kwashiorkor is a PEM (Protein–energy malnutrition) usually characterised by a pot belly. Why is there a pot belly in the case of a malnutrition? I have found contradictory reasons. This paper says ...
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What does a hornet nest foundress feed on?

After wintering, hornet queens will build a new nest from scratch. Once the new workers have hatched, they will fly out and collect carbohydrates to feed themselves and the queen and will also hunt ...
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What vitamins exist for other animals but not humans?

As you probably know, humans are among the minority of animals that require Vitamin C and don't produce it ourselves. For whatever reason (multiple theories exist), we lost the ability. Meanwhile, the ...
TheEnvironmentalist's user avatar
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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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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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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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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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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 ...
Jakob Abfalter's user avatar
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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 ...
user103297's user avatar
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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 ...
mic's user avatar
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4 answers
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Is there any organism that is born with all the nutrients and resources needed for their entire lifetime?

I understand that adult mayflies have no mouth, but they do take in oxygen through openings in their exoskeleton. Is there any organism that does not need to ingest any type of nutrition and does not ...
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Is the salt obtained from meat (as the primary diet) nutritionally sufficient?

This post is derived from that one, where someone says if you meant salt as a nutrient such as carbs, protein and all, there is salt in the stuff one eats already. The background is "Naked and ...
fu DL's user avatar
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Does body absorb nutrients less efficiently if we ingest the same amount at the same time, opposed to spreading over a larger period?

I would like to understand if ingesting a certain amount of nutrients will result in different absorption from my body, depending on whether I ingest that amount spread over time or everything at once....
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