I can only offer personal anecdotes. I was on many different diets since I was very little. I've been a strict vegan and a carnivore and gluten-free and diary-f

I can only offer personal anecdotes. I was on many different diets since I was very little. I've been a strict vegan and a carnivore and gluten-free and diary-free, bla, bla ... way before any of these were fashionable. Everyone of these diets had their drawbacks. For example, veganism left me frail and weak whereas all-meat carnivorism did make me rail-thin, strong and agile, yet gave me terrible breath and complexion, not to mention digestive issues. Now I eat everything (fried stuff in moderation, though) and do intermittent fasting. So far it works for me. My body took very well to time restrictions as opposed to food restrictions. YMMV.