Tin foil hat time.
The term diet, as used today, is a complete fabrication of a predatory industry who make money off selling you food, supplements, and other products.
Rather what you should be doing is finding an equilibrium work/exercise, food consumption, and relaxation.
For me, I was at my healthiest eating and drinking practically anything I wanted, in exchange for working long physical hours in a kitchen, and using a bicycle to get to and from work.
Does this lifestyle fit everyone? No. But I have never once followed a diet, never seriously spent time in a gym, nor had someone coaching me on my life's choices. I just did it all in moderation till an injury forced me to change to lighter meals and significantly less outdoor activities.