If you really think about it, life is very deep and rich and yet at the same time tragic and comical. Not only have humans gone through generation after generation, slowly accruing empirical knowledge, but so have the animal kingdom and plant kingdom too. The fish we eat today are multitudinous descendents of fish our ancestors ate thousands of years ago. And the same thing for the potatoes and wheat grains and vegetables and whatever else.
It shows you our genetics is a secret link to the past, and that man is heaven and earth in miniature.
Another thing one must realize is that to eat meat, eggs, and fish, you have to kill animals. Cute, fuzzy warm animals. And being vegan is just avoiding the problem, since you can’t live without killing. Even taking a shower or using pesticides (natural or synthetic) is killing. We are at once one with creation and yet since we have fallen from grace, we must kill or be killed.
Thankfully, man is the apex predator, but that doesn’t mean we are all safe all of the time.
What I am trying to say is, any subject of human endeavor can give you deep insights into the human condition, even the most basic subject, nutrition.