I’ve done quite some diets in my life ranging from a couple of weeks to half a year and beyond. Here is a list of which works best for me while working out 2h+ a day (bodyweight, strength endurance):

1.) Caloric restricted supplemented intermittent juice fast, basically no recovery needed

2.) Same as 1.) but cooked vegan

3.) Raw Vegan, 80/10/10, skin becomes as smooth as it gets

4.) Warriors Diet, non-vegan but after a while the desire to eat meat vanishes naturally, you can eat till you burst on cheat days and still lose weight.

5.) No diet at all, energy levels are ok

6.) Slow carb diet, constant sucking in stomach and hunger

7.) Ketogenic diet, joint pain

8.) Carnivore diet, exhaustion just by taking the stairs.