http://en.allexperts.com/q/Wild-Animals-705/Primate-strength.htm
The first thing to bear in mind is that there a vegetarian diet contains all the basic components of a meat diet, apart from a few nutrients, such as vitamin B12 and folate. This means that an ape can build up the same muscles and strength from a vegetarian diet as from a meat one. I have not read anywhere that chimpanzees, or humans, with a mainly vegetarian diet are any weaker than those with a meat diet.
This is a good one. Maybe with people that don't use weight, I suppose the differences may not be much. Never really though about it, but now it makes me wonder.
With people who train, though, there must be a difference. Say with twins or whatever, all other things equal, wouldn't the meat eater be far more progressed? Fuck, for all I know it's been a myth. Funny how something so basic could remain unclear.
http://en.allexperts.com/q/Wild-Animals-705/Primate-strength.htm
The other thing to consider is that it can take less time for a vegetarian to find food. For example a leaf eater in a tree doesn't have to go far to find food, assuming that it is able to digest the leaves of the tree it is in (and it would be a poorly adapted leaf eater to inhabit trees when it couldn't process the leaves).
This is another thing that gets me. With gorillas, it's all about vegetation etc. and not even bean protein. How in the hell does a gorilla or any other "leaf eater" get the amino acids needed for muscle?
http://en.allexperts.com/q/Wild-Animals-705/Primate-strength.htm
A meat eater may use up a lot of energy obtaining food. It seems that most of the hunts of a big cat are unsuccessful, so that means a lot of energy being used before it can be replaced from food. Cheetahs, for example, may use up a lot of energy in unsucessful hunts and, when they are successful, may have their fiood stolen from them. In order to build up muscles and strength, the energy obtained from food must exceed the energy expended on obtaining that food.
This is going to play a big part in it. No doubt about it.