Are lentils and peas really so bad if you didn't eat then excessively? I wouldn't think so. nostr.fmt.wiz.biz 

 Of course they aren't. Hundreds of thousands of years of evolution made humans the omnivores they clearly are, with a long intestinal tract and omnivore teeth to show for it. Humans have an entire metabolic pathway for carbs. Stuff like that doesn't evolve just for fun, it evolves because it improves fitness (in the evolutionary sense). 

Even if you only eat meat, the excess proteins are converted into carbs *by your own body* before being metabolized.

In nature, even true carnivore species have double digit percentages of non-meat in their diet. 

 Its more nuanced and simple than that.  Legumes are just fine to eat when you dont have access to meat.   We’re adaptable organisms. 
Where we get into trouble is when we start replacing meat, eggs & dairy with legumes for long periods of time.  They are not very good for you.