But for most people that is also harder to digest. The "sleepy hour" after eating a huge burrito isn't a mystery, it's because you've eaten something that made your body focus only on digestion.
That said, I also know someone with a sensitivity to meat, so there's no one-size-fits-all rule.
I was a vegetarian for a couple of years in my teens, and then I ate a hamburger. I was very, very tired mmediately afterwards and for the whole next day... I actually think your body works harder digesting meat vs. vegetables and grains.
That said, I also know someone with a sensitivity to meat, so there's no one-size-fits-all rule.