I got into a discussion with a vegetarian friend of mine and was a little throw off by his arguments. Mostly when he said that humans weren't evolved to eat meat because we don't have sharp canines, we have teeth like a cow. I really didn't know how to respond to that. I did some digging around and came across this laundry list of reasons why humans weren't designed to eat meat. What would be your counter argument to these so I'm more prepared the next time this topic comes up? I'd prefer a straight-forward response that isn't too difficult to explain. (Sorry if this is a repeat question.)
When you look at the comparison between herbivores and humans, we compare much more closely to herbivores than meat eating animals. Humans are clearly not designed to digest and ingest meat.
Meat-eaters: have claws
Herbivores: no claws
Humans: no claws
Meat-eaters: have no skin pores and perspire through the tongue
Herbivores: perspire through skin pores
Humans: perspire through skin pores
Meat-eaters: have sharp front teeth for tearing, with no flat molar teeth for grinding
Herbivores: no sharp front teeth, but flat rear molars for grinding
Humans: no sharp front teeth, but flat rear molars for grinding
Meat-eaters: have intestinal tract that is only 3 times their body length so that rapidly decaying meat can pass through quickly
Herbivores: have intestinal tract 10-12 times their body length.
Humans: have intestinal tract 10-12 times their body length.
Meat-eaters: have strong hydrochloric acid in stomach to digest meat
Herbivores: have stomach acid that is 20 times weaker than that of a meat-eater
Humans: have stomach acid that is 20 times weaker than that of a meat-eater
Meat-eaters: salivary glands in mouth not needed to pre-digest grains and fruits.
Herbivores: well-developed salivary glands which are necessary to pre-digest grains and fruits
Humans: well-developed salivary glands, which are necessary to pre-digest, grains and fruits
Meat-eaters: have acid saliva with no enzyme ptyalin to pre-digest grains
Herbivores: have alkaline saliva with ptyalin to pre-digest grains
Humans: have alkaline saliva with ptyalin to pre-digest grains
Clearly if humans were meant to eat meat we wouldn't have so many crucial ingestive/digestive similarities with animals that are herbivores.