When you look at the comparison between herbivores and humans, we compare closer to herbivores than meat eating animals.
Take a look at this: (Done by: A.D. Andrews, Fit Food for Men, (Chicago: American Hygiene Society)
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 predigest grains and fruits.
Herbivores: well-developed salivary glands which are necessary to predigest grains and fruits
Humans: well-developed salivary glands, which are necessary to predigest, grains and fruits
Meat-eaters: have acid saliva with no enzyme ptyalin to predigest grains
Herbivores: have alkaline saliva with ptyalin to predigest grains
Humans: have alkaline saliva with ptyalin to predigest grains
A popular statement is; "In the wild, animals kill other animals for food. It's nature." First of all, we are not in the wild. Secondly, we can easily live without eating meat and killing, not to mention we'd be healthier. Meat and seafood putrefies within 4 hours after consumption and the remnants cling to the walls of the stomach and intestines for 3-4 days or longer than if a person is constipated. Furthermore, the reaction of saliva in humans is more alkaline, whereas in the case of flesh-eating or preying animals, it is clearly acidic. The alkaline saliva does not act properly on meat.
Also, all omnivorous and carnivorous animals eat their meat raw. When a lion kills a herbivore for food, it tears right into the stomach area to eat the organs that are filled with blood (nutrients). While eating the stomach, liver, intestine, etc., the lion laps the blood in the process of eating the dead animals flesh. However, eating raw or bloody meat disgust us as humans. Therefore, we must cook it and season it to buffer the taste of flesh.
Also, you have to understand that when our ancestors consumed meat, it was for survival reasons. At this day and age, we no longer need it because all of our foods are easily accessible to us.
Hope I helped.