Personally I think the best diet is good old fashioned basic food. Meat and two veg and the odd sweet thing if I fancy it.
I see this diet or that diet come and go. I have seen the UK butter industry practically killed of as people went to spreads (mostly plain margarine) in the 70s. Eggs became taboo at one point. I never ever paid any attention to any of it.
We evolved to eat meat, oats, some veg and tolerate sugars.
Issues come when we turbo charge, and anything processed in any way is off the ideal. Better off buying fresh greens and slicing than even pre sliced, no matter how fresh and even frozen pre sliced is getting farther away from ideal.
Sensible eye to exercise, regular old fashioned meals (sugar and loads of added fats were more luxury items once) should see you fine. Modern controls means no victorian arsenic and saw dust to fluff out bread production (bakers dozen not just smaller loaves). Saying that oily fish once a week is probably enough (polluted oceans / end food chain stuff and measurable heavy metals I understand).
Also without any real science behind me lol, I am a firm believer it's what you do 80% of the time that matters. The other 20% go get chit faced on beer, have a curry, chinese and that full fat boy coke or slim as wish on taste.......Not saying I always stick to my rigid regime (ho ho), but what I the basics great.