Interesting.
2019 covered and exceeded my expectations. Went from 114 to 88 kg bodyweight in 7 months, without loosing strength (relatively to the bodyweight, i.e. x2 bw DLs, etc.) Goal was 99kg.
I tried most of the existing diets, with ongoing feedback from my friend nutritionist. To name a few - keto, intermittent fasting, paleo, mediterranean.
I arrived to a personal conclusion, which claims that Diets (as they're suggested nowadays by the modern media) are for the sick people. Healthy people build habits, not following any hardcoded recipe blindly, adapt everything to themselves rather than following carved-in-stone suggestions, like 16 hours fast or whatever. Everything, when checking back my yearly food and training log, came down to physical activity, calorie deficit and quality food. I eat carbs, I don't eat when I don't want to, and otherwise. I can keep 14-16 hours fasting period, or I can eat each 4 hours - everything depends on my physical state - rest, load, sleep, energy levels, etc.
I surprisingly found that the 11 Habits list from the book of the Josh Hillis / Dan John "Fat loss happens on Monday" are actually the same conclusions I arrived to during my 2019 crusade.
I'm now happy whatever eater without fear becoming fat again.
I hope I didn't insult anyone by my statement about diets (surely I didn't mean to).