Questions tagged [diet]

The amount and variety of food consumed by an organism, usually for nutrition.

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49
votes
11answers
24k views

Can humans survive without consuming life? [closed]

Some people say that it's awful that humans eat animals. They feel that it's barbaric, because you're killing life and then on top of that, you're eating it, and that you should eat vegetation ...
13
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3answers
3k views

50:50 sugar/fat mixture

A couple of years ago I saw a BBC Horizon television documentary about sugar and fat. One section mentioned three experiments in which rats were given their ordinary rat food plus and unlimited supply ...
12
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4answers
314 views

How do antibiotics combined with a non-Western diet affect weight loss?

Wikipedia describes a Western diet as: ... higher intakes of red and processed meat, butter, high-fat dairy products, eggs, refined grains, white potatoes, french fries, and high-sugar drinks. In ...
11
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3answers
14k views

Can a carnivorous animal consume plants with no adverse effects?

While I know that in nature, carnivorous animals are poorly suited to eat plants (largely due to having sharp teeth, not grinding teeth, as far as I know), I was wondering if, in an emergency ...
9
votes
1answer
918 views

How harmful is aluminium?

I have been taught in school that aluminium is harmful for brain. Thus sour meals should not be cooked in aluminium pots and it is unhealthy to add lemon juice to tea while there is teabag in the cup, ...
8
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3answers
290 views

Is Einstein's mass energy equivalence ($E=mc^2$) relevant to biological systems?

I'm more than 100% sure that the kilograms I eat don't get directly converted to feces and urine. I'm sure some of it goes to regenerating tissue that is constantly being disposed as well, and maybe ...
7
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2answers
17k views

How do large herbivores get enough protein?

The food they eat seem extremely low on protein. Do they need less protein per mass unit than carnivores? Most of them grow quite a lot in the first year, is most of that from the mothers milk?
7
votes
1answer
59 views

Is there any conclusive study relating the food consumed and the occurrence of acne?

The internet says a million things about what to eat and what not to eat in regards to impacts on acne. For instance: Refrain from dairy products. Refrain from food heavy in unsaturated fat. Refrain ...
6
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4answers
36k views

What makes humans omnivores, and not herbivores?

Some vegans claim that humans are herbivores, not omnivores, and that we are not physiologically designed to eat meat (see here: http://www.peta.org/living/food/natural-human-diet/). "According to ...
6
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1answer
603 views

Are the brains of any herbivorous animals capable of utilising ketone bodies as an energy source?

I ask this question because earlier today I heard from a lecturer at my university that a sheep's brain cannot utilise ketone bodies as an energy source and hence with insufficient glucose supply for ...
5
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1answer
827 views

Are carbohydrates an essential component of human diet?

Are people able to satisfy all the needs of a healthy diet without consuming carbohydrates? My question includes the assumption that a person has no health condition that would prevent them from ...
5
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1answer
2k views

Why do blue jays eat my cat food?

We buy some run of the mill big-box store cat food. Over the last several weeks, I've observed a blue jay landing on the cat food dish, taking a piece or two, and flying off with it. I assumed it was ...
5
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1answer
1k views

Can reptiles digest grains?

As a caretaker of a turtle, I sometimes struggle understanding the logic behind the inclusion of corn, soybean, and wheat meals in reptile food, such ingredients seem truly aberrant from what a ...
5
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1answer
1k views

What are the most important factors influencing a person’s gut microbes?

You are your bacteria! The probiotics and the antibiotics... There has been on going discussions about how our gut bacteria is important for a healthy lifestyle. Figure 1: Schematic diagram ...
5
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1answer
66 views

Ultra Pasteurization and Pasteurization

What is the effect of pasteurization and ultra-pasteurization on proteins, enzymes, and nutrients found in milk and other dairy products?
5
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1answer
237 views

What effect do oligosaccharides, like those found in legumes, have on the composition of intestinal flora in humans and if so how so?

I know that intestinal flora metabolising oligosaccharides, like those found in legumes, is the cause for the well known fact that legumes cause flatulence, but does an oligosaccharide-rich intestine ...
5
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1answer
98 views

Is “aggregate percentage” still a valid term in ecology?

Martin et al. 1946 define "aggregate percentage" as a metric that describes the mean percentage contribution of a group to the total mass/abundance of all samples. The metric is useful in datasets ...
4
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2answers
162 views

Does eating beans of a mother cause flatulence on babies?

Is it true that if you eat beans it could cause flatulence on babies (when breastfeeding them)? I can't find any research or scientific facts about that topic. I thought the body of the mother would ...
4
votes
1answer
4k views

What is the brain's preferred energy source? Glucose or ketones?

As with all cells in our body, I know that the brain can get fed from both glucose and ketones, so my question is, given both of them, which one would the brain prefer to utilize first?
4
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2answers
2k views

Are Pond Algae Edible for Humans?

I've been farming freshwater fishes. After some time, i found some green algae grows there. When the algae dried, it looks like nori (which commonly used for sushi wrapping). So, i wonder if those ...
4
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2answers
86 views

Do birds change their diet before migration?

Migration takes up a lot of energy, so I am wondering if birds (in my case mallards) change their diet / food preferences in the weeks before migrating. Do they select for more energetic foods to fuel ...
4
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0answers
731 views

Does variation in human gut length vary predictably with diet of ancestors?

Background: Numerous online searches, textbooks and other sources seem to pin the average length of the human gut from mouth to anus (oroanal) between about 5-10m in length. To pick a reputable ...
4
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0answers
99 views

Does anxiety about weight or eating cause people to become overweight?

A while ago I saw this TED talk about the futility of dieting. The speaker suggests that a body maintains a homeostatic weight point and returns to that weight after dieting has stopped: Turns out ...
4
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0answers
104 views

How is nutrient uptake in humans measured? [closed]

There are many claims made about nutrient absorption, eg "Juicing helps you absorb all the nutrients from the vegetables". I'm curious to know how nutrient uptake is measured. Eg is it a pure ...
3
votes
2answers
319 views

Bodyweight loss vs calorie shortfall

I have read that 1g of pure fat has 9 Calories. If I dieted successfully in a way that did not cause me to loose muscle, and I had a cumulative calorie shortfall of 90,000 calories. Would that ...
3
votes
1answer
2k views

Is Sugar a stimulatant or a weak sedative?

Quite often, I have heard the remark that children become hyperactive when high amounts of sugar are consumed. But common websites suggest that sugar is a sedative, and the hyperactivity in children ...
3
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0answers
503 views

Can a lion be fed cat food? [closed]

Is there a correlation between eating raw meat and aggressiveness in felines and canines? Growing up, I was always told to cook the meat I gave to my dogs and cats so as not to give them the "taste ...
2
votes
1answer
23k views

Can white eggs be considered as non-vegetarian? [closed]

I am basically a vegetarian and I find it very difficult to get an actual biological answer for this question on search engine. There are couple of links which discuss these argument but can not be ...
2
votes
4answers
422 views

Why do people eat meat?

My main question is why do people eat meat? Can we not survive without meat? I recently became a vegetarian and I have not yet felt any impact on my health. Can any one explain this phenomenon from ...
2
votes
1answer
397 views

Why is coconut oil healthier when it has so much saturated fat?

I noticed that coconut oil has ~96% saturated fat, and I was under the assumption that saturated fats = bad for health. Why is it that coconut oil is healthier to alternatives with much less ...
2
votes
1answer
182 views

Essential fatty acids function [closed]

Why are essential fatty acids so essential? I know that if taken less then it would cause diseases, but what metabolic role do they play? Are their importance is just because of their structural role?
2
votes
1answer
80 views

Can a chicken's lard become liquid depending on its diet?

On Cooking.se, somebody asked a question about the fat in chicken stock sometimes being liquid and sometimes solid once the stock has cooled. The only answer until now suggests that the difference is ...
2
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1answer
426 views

Why are Taurine and Arginine essential components of the feline diet?

Taurine and arginine play a key role in the feline diet but I am unaware as to where exactly they fit in.
2
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1answer
2k views

How does an excessive amount of beta carotene affect skin colour?

How much is the daily need of beta carotene and how many carrots have to be eaten in order for one's skin to turn "orange". I found 2-4 mg/ day as basic need, 30 mg daily over three weeks turns white ...
2
votes
1answer
96 views

How essential is vitamin B3 to the diet?

I know this might seem contradictory since by definition a vitamin is an essential part of the diet but I have read that nicotinamide, a form of vitamin B3, can be synthesised from L-tryptophan. Is it ...
2
votes
0answers
36 views

Can the human body survive in a zero sugar diet strictly through gluconeogenesis?

I read an article a while back about athletes (I believe cyclists) being exposed to a 0 sugar diet and their blood sugar levels stayed relatively constant, which prompted the question whether people ...
2
votes
0answers
68 views

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 ...
2
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3answers
400 views

Does genetic morbid obesity exist?

With the acceptance of being a little overweight I hear of people saying they were born morbidly obese and it was genetically passed on. I'm aware being so obese leads to countless health issues, yet ...
2
votes
0answers
54 views

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 ...
2
votes
0answers
54 views

Can you change your gut microbiota by changing your diet? Would that affect calorie uptake?

I have seen peer-reviewed papers mentioning the daily changes in gut microbiota composition according to dietary changes. See for example this paper: http://genomebiology.com/2014/15/7/R89 My ...
1
vote
1answer
3k views

Does dairy negatively affect the voice for singing?

Singers and actors are warned not to consume dairy, primarily milk, before a performance. From personal experience, I know that this is a very valid warning. It is commonly assumed that this is due to ...
1
vote
1answer
100 views

Protein diet composition

I have read that non veg food are better for proteins while veg food is deficient in either one or other protein. If it is so are herbivores protein deficient always in case of animals as well as ...
1
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1answer
57 views

Can the dietary fibres as chemical compounds be regarded as polymers? [closed]

At the level of molecular structure, can the dietary fibres be regarded as polymers?
1
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1answer
116 views

Is it possible for a person to eat so many carrots that one turns orange?

I once read that Jerry Rubin (a famous 1960s activist) ate so many carrots that he turned orange. (This was in the East Bay Express, around twenty years ago.) I assumed it could be true, though he ...
1
vote
1answer
222 views

What is the evolutionary reason behind human preference for salty foods?

It's been established that food palatability is related to it's caloric density. This hypothesis is used to explain why humans are partial to sugar and fat. But it is also said that humans are partial ...
1
vote
1answer
112 views

When consuming carbohydrates and fats together, why are the fats caloric?

If I understand things, and I most likely don't: mammals primarily use carbohydrates to produce metabolic energy when there are sufficient carbohydrates to do so. The use of fats for fuel requires ...
1
vote
2answers
2k views

Is there enough vitamin B12 in lakes, rivers and ponds, for humans not to need to take supplements?

Vegans will often say that having an animal-free diet is best for our health and is actually the diet that humans should be eating to function optimally. To which meat eaters will raise the issue of ...
1
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1answer
91 views

Creation of healthy genetically modified crops [closed]

GM crops are huge at the moment, and the noticeable 'counter movement' is for people to continue to purchase organic foods (please note I am specifically talking of GM crops and not meats, etc). The ...
1
vote
0answers
17 views

What happens to lipoprotein lipase after a sugar only diet?

Insulin increases the activity of lipoprotein lipase thay allows cells to take in lipids from chylomicrons in the blood. If a person takes a sugar only meal like drinking coke, insulin is released. ...
1
vote
0answers
130 views

How many calories does an adult male goat need per day? [closed]

If I might be more specific, I'm interested in the calorie intake of a packgoat. But I'm happy with just some calories necessary for a general goat, so long as its estimated body weight is also given. ...