I'm late fifties, male, Orthodox Christian, medium-slim, build, not particularly into anything physically strenuous, so I don't need many calories. My food is basically the standard Orthodox "wine and oil allowed" rank of Church fast, which cuts out dairy, eggs, fish and meat. (We're supposed to usually fast this way on Wednesays and Fridays, but I do it all the time.) I also don't eat molluscs, crusteceans and sea-fruit, honey, sugar, chemicals and food additives, processed foods generally, spices, coffee, alcohol, goat/sheep milk, crappy oils that aren't cold-pressed, crappy table salt that includes aluminium or cyanide, fluoride toothpaste, anything with soy, and I don't eat any fresh or dried fruit or drink fruit juices or make smoothies, etc., corn is a bit hard on my biome, so I avoid it.
Been this way for 5-6 years. I feel fine. I feel light on my feet, energetic for general purposes, and have a lot of slow-burn stamina. I feel awake, lucid, mentally aware. My skin is clear and I don't stink too much. I hardly ever get sick, not even colds and flu.
Well, what do I eat?
Rice, flour, potatoes, oats, bread, grains, seeds, cereals, pulses, peas, beans, tomatoes, cucumbers, olives, (Black Olives Matter) not many veges at all, lots of olive oil, good salt, vitamin C pills, black, green and herb tea, and that's about it.
(I can hear everyone screaming now! Don't worry, I know! I know!)
Anyway, I just want to support @JokerBear
. Even though my calorific intake is probably less than half of his, the principle is the same: one's biome matches one's activities. I'm eating like this not for reasons of health, but because it keeps me in a good frame of mind for non-stop prayer throughout the day. It's all I need.
Meat is fine, eggs, and dairy are fine. Fish is fine. Enjoy your coffee and alcohol. It's fine!