the following articles write that our human body was meant to consume a plant-based diet only. Some points include that our teeth (though some look sharp and pointy, but it's mentioned in the article that it's still not like canine teeth) were meant to chew vegetables, and our intestines are long. Long intestines are made long specially to absorb the many nutrients of the veggies, therefore it's long. Herbivores all have long intestines (like us humans), whereas carnivorous animals have very short intestines. Therefore, we can see that our human body is made to live on a diet free of animal products. more details can be found from the links.

look at this site with all the info about our human body, very detialed:
http://www.nealhendrickson.com/mcdougall/030700pumeatinthehumandiet.htm

other sites:
http://www.rawfoodexplained.com/why-we-should-not-eat-meat/the-best-fuel-for-the-human-body.html

http://herbsupplement.cn/do-not-eat-meat-a-long-time-age-immunodeficiency/

and these were just googled. if you want to find the real truth, why don't just google it first? 'cause many scientists are saying the same thing; meat only harms.

there was this scientists who remarked that he didn't know why humans had to add meat to their diet because it doesn't bring any benefit at all