I will contribute only one thing to this thread:
TheLion’s Diet (1.5 years):
I eat filet mignon, 1 or 2 small steaks, every day. With homeade peach salsa. I alternate with chilean sea bass to mix things up, also with peach salsa.
I eat cucumber or carrot or seaweed salad.
I eat lots of rice, with miso soup: I have top rice cooker–go buy one. Japan should replace current flag with flag of rice cooker! Just best thing ever for quick eating.
I eat soba noodles topped with omelet, sunny side up, every other day.
I eat sushi of seaweed, cucumber, vinegar rice: eal + capelin roe, or salmon roe, or bluefin, or sea urchin roe. I make myself, or buy if lazy and same ingredients are available, or if crab fried is availabe. This, every other day, or every two days, according to whether I feel like it.
I like osetrina fish, but its not always available where I live, so I eat it much less often than above. I highly recommend visting Russian stores to get it, and eat it every other day, if possible.
(Then again, I’ve also eaten spam + rice + cucumber + seaweed roll, but only 5 times in whole life. That because spam, delicious and cheaper, however feels like I swallowed a cement brick.)
I drink hot green tea (matcha), and sometime nice black tea (chefir): This, or plain cold water held in fridge. Nothing else: no coke or pepsi or sweet drinks!
If I want sugar, no deal. No snacks, nor anything sweet, unless its small piece of dark chocolate.
I found this gives best results in terms of work productivity. I’ve eaten nothing else, except if I visit restaurents, which usually feels disappointing in comparison to what I usually eat.
It is quick to produce diet, but marginally more expensive for one person. It also takes cooking skills, and requires 1 hour daily to produce, plus 1 hour daily all three meals to consume.
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Not too much fat, not too little fat. Too little fat or meat means calories must come from more bulky or less calorie dense source, grains, so that digestion problems occur, because too much energy is required to digest (what we learn from controvery about George Stigler’s “optimal cheap diet” of bulk grain + spinach + condensed milk).
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Never eat food which is not tasty. Tasty food is more easily digested, because of nervous and reflex connections. (Go figure! Pavlov won his nobel prize for this point, that tasty food is better digested than less tasty food, all other things equal, in his late-1800’s book.) Pay more, but eat tasty food which is not made of sand plus glue when it enters your stomach.
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Don’t eat anything else. As far as ice cream: Blue Bell if available, just about nothing else if no available, unless you want to pay for fedex plus dry ice. I don’t, but local restaurent offers it.