16 votes
Accepted

Why does biomagnification of mercury occur more in large fish?

Bioaccumulation occurs when organisms aren't able to excrete/eliminate/metabolize something as fast as they take it in. The specific circumstance of predators higher on the food chain accumulating ...
Bryan Krause's user avatar
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12 votes

What makes humans omnivores, and not herbivores?

As the answers given already point out, humans are generally considered omnivores that are able to use food sources available to them opportunistically. Apart from that, there actually is not much to ...
AlexDeLarge's user avatar
  • 2,868
10 votes

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

First of all, for those readers with less knowledge of the general principles of biology, I want to state an important, even if obvious, point: The brain doesn't "prefer" anything. Despite ...
Don_S's user avatar
  • 474
9 votes
Accepted

How harmful is aluminium?

Here is a link to the Public Health Statement for Aluminum produced by the Centers for Disease Control and Prevention (CDC) in the United States. There is much more information on the web page but ...
wanderweeer's user avatar
  • 2,733
7 votes

Why do people eat meat?

There are many reasons for why people eat meat. Some of them are to be discussed here and some of them have nothing to do with biology. Reasons that have nothing to do with biology There are many ...
Remi.b's user avatar
  • 68.1k
7 votes

What makes humans omnivores, and not herbivores?

The simple answer is humans are omnivores – physiologically – because we have the capability to digest both plant and animal matter. Many humans are behavioural omnivores as well, consuming both as ...
James Hiew's user avatar
7 votes
Accepted

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

Short answer Any law of physics will of course be applicable to living beings. However, in the absence of mass gain and mass loss, the input = output equation for ...
Remi.b's user avatar
  • 68.1k
6 votes
Accepted

50:50 sugar/fat mixture

1. What was the original research paper? This one appears close: Hyperphagia in rats produced by a mixture of fat and sugar (PubMed, 1990) Experimental groups were fed sugar (sucrose), fat (corn ...
Jan's user avatar
  • 8,079
6 votes

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

No, the mass-energy convertibility has no practical relevance to biology. The amount of mass produced or lost in the chemical reactions in biological systems is so small as to be immeasurable and is ...
mgkrebbs's user avatar
  • 9,054
6 votes
Accepted

Does eating beans of a mother cause flatulence on babies?

When the mother eat beans, the fiber (oligosaccharides) from them is not digested in the small intestine, so it travels to the large intestine, where normal intestinal bacteria break it down to some ...
Jan's user avatar
  • 8,079
6 votes
Accepted

Why do wild animals not eat in captivity?

Many wild animals will not eat in captivity because they are under stress, few mammals react well to captivity. weird smells and sounds, restricted movement, inability to hide, there are dozens of ...
John's user avatar
  • 14.7k
5 votes

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

No, it is not. There are no nuclear fission or fusion reactions being performed in a biological context, for reasons that should be immediately obvious. Mass is not being converted to energy, or vice ...
MattDMo's user avatar
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5 votes
Accepted

Why do blue jays eat my cat food?

Like other Corvids (Jays, Crows, and Ravens), Blue Jays are omnivorous and can eat and digest both animal and plant matter. Animal matter can include insects, carrion, small birds and mammals, and the ...
GForce's user avatar
  • 230
4 votes

What makes humans omnivores, and not herbivores?

There are several lines of evidence. Behavior, we regularly eat meat. This is the one that matters most, omnivore is a behavioral classification. All humans societies eat meat, a few eat little else ...
John's user avatar
  • 14.7k
4 votes

What makes red meat less healthy than seafood, after millennia of evolving to eat meat?

Interesting question that reveals a very common misconception about evolution. Evolution is not the same as optimization or advancement. It is about selection. Cancer and heart disease mostly kill ...
Karl Kjer's user avatar
  • 7,663
3 votes

Why do people eat meat?

Tribal peoples throughout the world have revered meat since the times of cave paintings, over 30,000 years ago and the oldest stone arrowheads are 66,000 years old. Chimpanzees also eat meat. They ...
bandybabboon's user avatar
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3 votes
Accepted

Do birds change their diet before migration?

Apparently, yes. This article underlines the changes in diet in semipalmated sandpiper before its 3000 km-long migration: Near the beginning of their journey, sandpipers stop at the Bay of Fundy on ...
LinuxBlanket's user avatar
  • 1,313
3 votes

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

Of course there is no evidence for the superiority of the vegan diet claim to begin with, so there is that, and there are plenty of vegan foods fortified with B12, even some from non-animal sources. ...
John's user avatar
  • 14.7k
3 votes
Accepted

Protein diet composition

Link from VonBeche is good. Proteins vary in amino acid content. Humans can make some but we need 9 of them in our diets. from https://www.ncbi.nlm.nih.gov/books/NBK234922/ Nine amino acids—...
Willk's user avatar
  • 2,964
3 votes

Are Pond Algae Edible for Humans?

First off: Don't risk it I'm not an ecologist but I believe the type of algae you are holding tends to be cyanobacteria. Cyanobacteria make all kinds of toxins, check the first table in this article....
mimat's user avatar
  • 1,425
3 votes

Are Pond Algae Edible for Humans?

I came across a this Wikipedia page which said blue green algae from ponds can be used as dietary supplement (in tablet form). Many other articles on the internet like here suggest it is included in ...
Chimango Chisuwo's user avatar
3 votes

Can the dietary fibres as chemical compounds be regarded as polymers?

Dietary fibers are the indigestible portion of food derived from plants. Most of these are indeed polymers of sugars (that is, a chain of repeated basic unit of carbohydrate), for example cellulose, ...
Eliane B.'s user avatar
  • 1,145
3 votes
Accepted

Does baking soda interfere with digestion when cooked into food?

The relationship between acid and bicarbonate is that 1 H+ neutralizes 1 bicarbonate (HCO3) molecule as represented in the following equation: HCl + NaHCO3 --> NaCl + H2CO3 So assuming that the ...
bob1's user avatar
  • 12k
3 votes
Accepted

Do cheetahs compete with lions?

Yes, cheetahs do compete with lions. Cheetahs can share the same habitat with lions; however, they actively avoid lions (and also hyenas and leopards). They are smaller carnivores/predators than their ...
ermanen's user avatar
  • 1,117
3 votes
Accepted

What do Wild Silverfish Eat?

Silverfish are shredders. Shredders are... ...responsible for processing coarse particulate organic matter (CPOM). CPOM is greater than 1 mm in size and typically derived from allochthonous sources, ...
AliceD's user avatar
  • 52.4k
2 votes

50:50 sugar/fat mixture

I have to apologize at first, we had that phenomena in a lecture but I am not a native speaker and some of the processes are maybe wrong translated. Despite the other answers, I have learned that ...
LurioTabasco's user avatar
2 votes

50:50 sugar/fat mixture

It is easier for the body to use carbohydrates as energy source rather than lipids. When the food is full of fat, the mouse will use fat as a source of energy and only a little part of it is stored. ...
Nemexia's user avatar
  • 322
2 votes

How do large herbivores get enough protein?

The protein RDA of another mammal, the human, is 70g every day, that's about 700g of hay if he can get 100% of the protein from it, that's 4 kilos of grass. So a 700 kilo cow would need about 40 kilos ...
bandybabboon's user avatar
  • 10.4k
2 votes

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

Firstly, it should be noted that a stable, healthy microbiome is generally thought to be a marker of health; actively disrupting it through diet in an attempt to fight with it over nutrients is ...
Maximilian Press's user avatar

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