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Questions tagged [nutrition]

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

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Recommendation for daily intake of natural sugars

There multiple articles/topics raised on the internet about the free/added sugars in the human diet as for example WHO recommendation on page 16, but at the same time not that much about the naturally ...
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1answer
17 views

Understanding food composition data from USDA for Vitamin A

When researching the nutritional value of carrots the Vitamin A comes in two measurements as RAE and UI: https://ndb.nal.usda.gov/ndb/foods/show/11124?n1=%7BQv%3D1%7D&fgcd=&man=&lfacet=&...
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12 views

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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2answers
289 views

How does zoo and laboratory animal feeding work?

What steps are taken to ensure those animals are fed adequately? When dealing with larger populations of animals, how is it ensured that all of those animals received food during a certain time period,...
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0answers
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Why the dietary requirement of vitamins and minerals increase as children/adolescents age?

Recommended Dietary Allowance for vitamins and minerals, Source : Harper's Illustrated Biochemistry. The above taken data suggests that children require less vitamins and minerals in their diets ...
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1answer
35 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?
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1answer
40 views

Why are plants unable to take up Phosphorus directly in their organic form like Phytic Acid?

I am researching acquisition strategies of phosphorus by decidious trees. I am reading a lot that plants take up nutrients as their inorganic form. In the case of P according to literature this is ...
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1answer
128 views

How does a glucose molecule enter the cell from blood vessel?

The transporters in the plasma membrane of the cells promote the entry of glucose molecules from the extracellular matrix to the cytosol of the cell. Could someone explain how does the nutrient ...
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1answer
60 views

Why do ADULTS need protein in their diet, if they are not growing? [duplicate]

Why do ADULTS need protein in their diet, assuming they are not growing? What happens to the amino acids already present in the body? Why don't our bodies conserve them?
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1answer
43 views

Can supplements affect DNA? (Could 10,000% Methylcobalamin affect MTHFR genotype)

Originally titled "Could B12 supplementation affect dna test results for B12 need?" - B12 just seems like a good example question to frame the more general question of "Can supplements affect DNA?" I ...
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1answer
348 views

Why does protein have 4 calories per gram?

As I understand it, protien that isn't used for building and repairing the body is inefficiently converted into glucose in the liver (at a rate of roughly 3 grams of protein per gram of glucose ...
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30 views

What determines the energy efficiency of our bodies?

Ingested food is broken down into the macronutrient components and then absorbed into the body. They are then used immediately or stored for future use. However, our energy efficiency is very low. So, ...
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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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28 views

Are saturated fats beneficals for the brain's functions?

Are saturated fats beneficals for the brain's functions? if so, which kind of saturated fats? I found this information about medium-chain triglycerides (found in coconut oil), 1)it is smaller than ...
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1answer
67 views

How is the urea cycle regulated with respect to protein deficit?

Proteins cannot be stored in the body. Excess proteins from the diet are deaminated in the urea cycle that takes place in the liver. The liver is the first contact since these amino acids are ...
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1answer
84 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 ...
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1answer
82 views

Is this answer about the limiting factor correct?

The graph shows the result of adding both phosphorus and nitrogen to different algae populations. I have a hard time figuring out why the correct answer is C, I thought that groups 4 and 5 would have ...
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1answer
43 views

Where different types of proteins can be found in food?

According to https://www.youtube.com/watch?v=KSKPgaSGSYA (created by one of the largest supermarket chains in the UK), different proteins have different roles in human body: (Group 1) They’re like ...
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3answers
46 views

How big is a baby's stomach?

There is a lot of contradictory information on baby feeding volumes on the internet. A common claim is that a baby's stomach is the size of a hazelnut or small marble, with a volume of 5-7 ml. But ...
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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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1answer
30 views

Is there a standard way of measuring culture nutrient levels in real time?

I am working on optimizing growth rates for a culture, and one thing I'm trying to monitor is nutrient consumption rates to pinpoint any bottlenecks, i.e. the culture goes through all the calcium in a ...
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0answers
57 views

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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0answers
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Ingestion of cellulose digesting prokaryotes? [duplicate]

If humans digest cellulose digesting prokaryotes, can we start digesting cellulose like cows?
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36 views

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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1answer
145 views

Where do kombucha SCOBYs get nitrogen?

Kombucha can be brewed even with tiny amounts of inocculate, such as the little bit of sediment at the bottom of store-bought kombuchas. Over 1-2 weeks, this can grow into an inch thick film covering ...
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1answer
110 views

Why does enteral carbohydrate yield higher energy than parenteral?

The following is written in a well-known textbook of surgery: Each gram of enteric carbohydrate provides 4.0 kilocalories (kcal) of energy. Parenterally administered carbohydrates (eg, ...
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0answers
94 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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0answers
31 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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42 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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0answers
175 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 ...
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2answers
79 views

How do we know we have to use the mouth for eating and drinking?

I have a question that I am very curious to: how do we know we have to use the mouth for eating and drinking? Because we have multiple openings where, if we didn't know better, could put food and ...
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3answers
786 views

How is a substance classified as a vitamin?

From wikipedia A vitamin is an organic compound and an essential nutrient that an organism requires in limited amounts. There are many essential nutrients to an organism. Glucose for example. ...
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0answers
33 views

Feeding animals or plants with coffee?

What happens if you feed animals or plants with coffee? Say, just once, or daily? There are some extra coffees in the pot, and I don't know whether it is a good idea feeding animals or plants with ...
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0answers
31 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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0answers
1k views

How much time can a human survive only drinking water and eating sugar? [closed]

If a person only drinks water and eats glucose, how long could they survive before getting any symptoms? When would the damage become irreversible? When would that person die from lack of minerals, ...
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1answer
585 views

Human can't digest cellulose…but the length of small intestine is approximately same in humans and herbivores [duplicate]

My question is why herbivores are able to digest cellulose and why can't we??
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2answers
467 views

How a vegan can consume all the needed varied proteins / amino acids?

I would like to ask if there are some proteins that the human body needs and can being endowed only from meat? According this: Other protein sources, such as fruits, vegetables, grains, nuts and ...
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0answers
147 views

Organ of ingestion in lice [closed]

I want to know that what the name of the organ used by lice for ingestion is? (also please explain if possible). In my research, I got this wiki page that didn't help me out. Then I found this link ...
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1answer
66 views

What does a typical, perfectly healthy vaccinium corymbosum (highbush blueberry) leaf look like?

What does a typical, perfectly healthy vaccinium corymbosum (highbush blueberry) leaf look like? Colour (darkness of green, redness) Waxiness Veins I'm guessing that soil ph, nutrients, and other ...
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24 views

are nutritional RDAs strictly daily or can they be averaged over days?

I am currently on a pure Joylent/Jimmy Joy diet, but working on software to develop normal meals that are nutritionally complete. I'd like to know if nutrition can be balanced by averaging values ...
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1answer
35 views

Watering plants with soaked forest soil [closed]

I am thinking of mixing forest soil with water and water plants with that. I was hoping that nutrients from soil would get released into the water, so in effect, fertilize the soil. I am not sure if ...
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0answers
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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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2answers
54 views

Need / consumption of magnesium

Does doing sports makes a human require more magnesium and – if any – how strong is this effect? Do athletes take magnesium supplements (e.g. pills of magnesium carbonate) because they build muscles ...
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0answers
79 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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0answers
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What would happen if all magnesium was removed from a person's body? [closed]

Magnesium is essential to bodily functions. It enables ATP from which most energy is produced in cells. It regulates over 300 biochemical reactions in the body. It is important to the transfer of ...
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1answer
4k views

Why aren't nucleic acids on Nutrition labels? [closed]

All the other macromolecules are listed on the Nutrition labels and nucleic acids do have some caloric value, why aren't they on the nutrition facts?
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1answer
394 views

Protein content in sprouted beans

I have checked on Wikipedia which says that sprouted mung beans has way less protein than normal one, while on web you will find articles saying sprouted beans are best, which is true, how do I eat ...
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3answers
206 views

Spruce growing high up in a maple trunk: Can a partially rotted trunk completely sustain another tree?

I've come across a spruce tree that is growing 15ft up in the crotch of a sugar maple tree: According to Google StreetView, the spruce has been there since before 2007 (over 10 years ago!). I've ...
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2answers
59 views

Is there any strong factor against human edible plants being widespread and easy to gather?

While many habitats have plants, fruits, nuts and berries available for consumption by humans walking by, most places (if any?) seem to require significantly more effort than simply picking our food ...
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168 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 ...