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

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4
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2answers
172 views

Can humans transdermally absorb minerals from ocean water, and if so how much?

According to several studies quoted here, chemicals can be absorbed by the skin transdermally, at least under certain conditions. When it comes to elements in seawater like sodium, magnesium, ...
-1
votes
0answers
22 views

What nutritions do a human need? (survival storage of food for crises) [on hold]

I wonder how feasible it would be for a government to store food/nutritions to feed the population for two years (long enough to deal with most imaginable disaster scenarios such as "doomsday clouds" ...
0
votes
0answers
17 views

What chemical form of vitamin A is in chicken's egg yolk?

After doing some existing background research I am confused as to exactly what, in an unfertilised chicken egg's yolk, offers what we intake as 'Vitamin A' upon eating it. Plants typically produce ...
2
votes
1answer
63 views

What's the difference between diuretic veggies and alcohol that make the latter bad?

So I'm reading this article to Treat Fluid Retention and it suggests Eat foods with diuretic properties. But also Avoid drinks that will dehydrate the body such as tea, coffee and alcohol. ...
2
votes
2answers
78 views

Is there a biological reason for spreading food intake into breakfast-lunch-dinner?

I keep hearing over an over how humans can satisfy their entire daily caloric need in one sitting at a fast food restaurant. At the same time I'm looking at the kitchen plates, cups, etc, and they ...
1
vote
1answer
26 views

Is the sense for salt depending on the electrolyte level in our body?

I often noticed, after (heavy) physical activity like cycling, running, swimming or working an isotonic drink (to recover the electrolyte level) tastes less "salty" compared to when drinking it before ...
3
votes
1answer
93 views

Tap vs. mineral water for drinking

I was told a human should drink a small glass (0,3 liter) of mineral water per day to get the minerals. What is the rationale behind this? What is the difference between tap water and mineral water in ...
1
vote
1answer
100 views

What is the difference between vegetable and animal fats?

I often hear from many people saying to waiters - "Please, don't put oil to salad". They probably believe the fat from vegetables has the same impact on the weight as an "animal" fat (meat, eggs, ...
2
votes
4answers
139 views

Why do the humans become sleepy after meals?

I don't know about all the mankind, but I know enough people, who becomes sleepy after their meals. Also, I'm not sure, what kind of food do they consume, but I personally get sleepy almost from any ...
2
votes
1answer
67 views

How do nutrients get to the cells they need to get to?

I understand the basics of digestion. I know that nutrients get absorbed by the microvilli, enter the bloodstream and travel to the liver but after all that, what is the biological mechanism that ...
1
vote
1answer
54 views

Do chickens always lay eggs?

http://de.wikipedia.org/wiki/Hühnerei says it takes up to 24 h for a chicken to produce an egg. Is that dependent on the chickens nutrition, i.e., if it does not get enough food or the wrong kind, ...
1
vote
0answers
39 views

Banana-only diet for humans [closed]

This YouTube channel appears to advocate a diet consisting almost entirely of bananas. From a biological point of view, does such a diet have any benefits? Or is this, as I suspect, dangerous ...
1
vote
1answer
40 views

Is it easier to burn a calorie of fat or a calorie of a carbohydrate?

Say someone eats 100 calories of chocolate vs. 100 calories of carrots. Something tells me that eating the chocolate will lead to you generating more fat. Will it? Is it harder to burn the calories ...
6
votes
3answers
91 views

laboratory mice, nutrition, and humans

It seems that many nutrition experiments [directed at human diet] are carried on laboratory mice. Is there any justification that nutrition that is good or bad for laboratory mice will also be same ...
2
votes
1answer
100 views

From a purely biological perspective, how does an optimal human diet look? [closed]

There is hardly any subject as contested in the media as what humans should eat. Usually, such discussions are devoid of actual scientific reasoning, though they all claim to be backed by scientific ...
11
votes
4answers
627 views

Has there ever been an attempt to create nutritionally tailored food for adult human consumption?

For all domestic animals, and for all animals kept in laboratory, complete and precise composition of perfect food is figured out (cat food, dog food, cattle, rats, laboratory monkeys and apes) -- ...
1
vote
1answer
104 views

What are the pros and cons of eating earth (soil)?

I wonder if there are any benefits to eat earth. What I mean by earth is the topsoil that is sometimes on vegetable (I eat organic vegetables and some of them like spinach are full of topsoil). I ...
-2
votes
2answers
92 views

Are the 8 principal sugars in glycoproteins “essential sugars”? [closed]

Are there "essential sugars"? Some have suggested that the 8 principal sugars found in glycoproteins are "essential sugars": Galactose Glucose Mannose N-Acetylneuraminic acid Fucose ...
-2
votes
1answer
44 views

Which people/race have more Vitamin C? [closed]

Which people/race have more Vitamin C? Black/White/Brown/Wheat color people?
2
votes
1answer
44 views

Mites on ginger root

I was just looking at some mouldy ginger found in the fridge under the microscope and was horrified/delighted to find (what looked to be) mites growing in it. I have searched the web and can only find ...
3
votes
1answer
31 views

Which part of oranges contain fiber?

I think it's pith, but here (non-english country) many chef suggest orange's vascular veins which look "fibrous" and have similar translated word with "fiber" itself. Please enlighten me which?
1
vote
2answers
139 views

Histidine - why essential for children?

Why is histidine an essential amino acid for children but not for adults ? What changes in the body occur which lead to the formation of histidine in adults but not in children ? What causes these ...
3
votes
1answer
63 views

Chemoautotrophy in large organisms?

The major nutritional mechanisms include chemoautotrophy, heterotrophy (including parasitism and saprotrophy) and photoautotrophy. All of these modes of nutrition developed first in prokaryotic ...
1
vote
1answer
68 views

Is fat distributed proportionally around the body?

One guide I have been using to tell me if I really am gaining a lot of weight is a ring around my 2nd last finger on my right hand, if I can slip it on and off without any resistance then I'm fine, ...
0
votes
1answer
22 views

To what extent is eating and nutrition important in recovery from minor illness like viral fever?

I'm guessing it is important, but just to be a little more precise, What would be the maximum amount of calories above which it is just a waste (or even harmful) How much does the metabolism raise ...
0
votes
0answers
53 views

Biological/molecular basis of nutritional need differences between blood types?

There are many nutrition books and websites (like http://www.aqua4balance.com/Healthy-Diet/blood-type-nutrition-educational-workshop.html) that assign very different nutritional needs to individuals ...
1
vote
1answer
143 views

Raphide toxicity in Pothos plant

Recently I found out that the common houseplant Pothos (Epipremnum aureum) is toxic to cats and dogs due to the presence of "insoluble raphides." I have a lot of these plants around my house and my ...
3
votes
1answer
84 views

In theory, would it be possible to create an injection of Vitamins, Minerals, sugars etc so that eating was no longer necessary?

I am wondering, out of pure curiosity, whether with current medical & biological science, (or indeed with accepted probable future developments in those areas), in theory, would it be possible to ...
0
votes
1answer
33 views

Distribution of nutrients throuought a drink made of plants?

In an attempts to eat my veggies for the day in one shot, I blended together a bag of salad with some water. The mixture separated by density, a thick top layer containing the bits of leaves, and a ...
1
vote
1answer
45 views

What are the biological and nutritional benefits of having numerous smaller meals a day?

I have heard here and there that instead of consuming 3 largish meals (the traditional 3 meals a day), that consuming several smaller meals throughout the day is beneficial for health (and weight ...
0
votes
2answers
69 views

What nutritious insects exist to farm that require the least attention?

What nutritious insects exist to farm that require the least attention? I'm looking to automate simply, in a self regulating way. Edit: To add detail, I imagine the insects would live densely in a ...
1
vote
0answers
21 views

Looking for detailed nutrient/energy flow at the bottom of the freshwater food chain

I am trying to model the production and consumption of nutrients and waste at the bottom of the food chain in freshwater ecosystems. I can only find broad information on the Internet and don't know ...
5
votes
1answer
111 views

functional hypocholesterolemia due to very high HDL or low LDL?

Nutritional and medical recommendations about cholesterol seem to focus exclusively on hypercholesterolemia, and as such, they provide only a maximum desirable level for LDL and a minimum for HDL. ...
2
votes
1answer
275 views

Can animals use the nitrogen in chitin to build proteins?

Fungi and insects contain chitin, which is about 6% nitrogen. Can an animal - like me - make use of this as a nitrogen source to build proteins? Are there any animals that can do this? Are there ...
1
vote
0answers
135 views

Are there nutritional benefits to drinking diluted urine?

I know that urine drinking is a widespread practice (with a long history). The main reason that people give today involves there being nutrients in urine. If there are nutrients to be gained, why is ...
2
votes
0answers
37 views

Vitamin and mineral contents of common fruits

I'm looking for nutritional data, mostly vitamin and mineral contents of common fruits, such as apples, bananas, oranges, kiwis etc. Are there scientific (published and peer-reviewed) sources that ...
1
vote
1answer
55 views

Do repeated freeze-thaw strip nutrition from vegetables/food?

For some inexplicable reason from the ladies in my extended family (even friends!) seem to believe that vegetables/food should be subjected to as few freeze/thaw cycles as possible. The rationale put ...
1
vote
0answers
73 views

Why does trans fat decrease hdl's?

I understand that cis fats increases hdl's, and unsaturated fat increases ldl's, but trans fat increases hdl's and it decreases ldl's. Why does trans fat do this?
8
votes
1answer
7k views

What is the composition of human feces?

Are there any studies or general information on the composition of human feces? I'd specifically like to know the percentage of carbohydrates and amino acids relative to the amount that was ingested ...
4
votes
1answer
145 views

Possible to Gain More Weight than the Food You Eat

I was wondering if it's possible gain more weight than the mass of the food you eat. At a first look, this is impossible because of conversation of matter, but are there other things to take into ...
4
votes
1answer
182 views

Is the amount of phosphoric acid added to colas enough to disrupt the function of the kidney over the long term?

Both Coca-Cola and Pepsi add phosphoric acid $H_3PO_4$ to their colas to give them a signature "bite". The kidneys use a phosphoric acid/dihydrogen phosphate/hydrogen phosphate homeostasis as one ...
6
votes
2answers
142 views

Do omnivore mammals vary food preferences based on dietary needs?

I'm wandering if mammals that can eat many different kinds of food (omnivores) vary their preference for food not only based on the availability, but also based on dietary needs? I'm looking at this ...
3
votes
3answers
147 views

What Defines a Food as Edible?

With many foods today containing chemicals, agents and preservatives etc... What biological criteria must a new food and its constituent components satisfy biologically, to be defined as edible? ...
7
votes
2answers
141 views

How was the guided daily amount (GDA) calculated?

We are constantly shown nutritional information on food packaging stating this food contains "x" amount of your guided daily amount. A linked to the values is here. How were these values calculated? ...
4
votes
1answer
147 views

What are minerals (other than zinc) that the human body cannot store

It is known that zinc is an essential mineral that the body cannot store. What are other minerals, especially metals, that the body cannot store? (other than water-soluble vitamins such as vitamin B ...
3
votes
1answer
3k views

What does the term 'bioavailability' mean?

From what I've read, Bioavailability is the degree to which food nutrients are available for absorption and utilization in the body. How would you explain this with an example?
1
vote
1answer
166 views

Human Body “Fat” Equilibrium

Here's my theory: If you consume x calories each day with y amount of caloric expenditure each day you gain zero weight, regardless of x and y being out of balance. If you then mechanically ...
13
votes
2answers
144 views

Relationship between our microbiome and personalized nutrition

Recently, it has been asked whether there are 'metabolic types' between humans that can benefit from a sort of personalized nutrition. One answer suggested that one discerning factor could be the ...