Okay, you're right. Heinlein's 'grokking' practice was meant as a representation of affection and respect. And, if we truly are what we eat -- bleahh. I don't want to grow mean and small-minded.
And yes, the weirdness of modern wealth -- the worst drug of all, the most addictive and damaging, with generational effects that routinely end in raving murderous psychopaths -- there's something that a smart culture would probably ban outright. FDR suggested a hundred percent tax rate on all incomes over a million dollars per year. Gosh, we could give them ten million, they'd still be more comfortable and secure than I've ever been in my life, and just think of all the lemurs and lamas and pandas we'd save from their trumpish grills.
I will admit that the spiritual aspects of veganism are not necessarily as important for me as the physical. Man, I feel good. Strong. Smarter. I snap back. I sleep good. I never have to see a doctor. Kale is my drug. Wow. So intense.