In the UK there's been a bit of a focus recently to avoid "ultra-processed" foods. The rule of thub being "if you yourself wouldn't put those ingredients in it, don't eat it".

There's definitely good evidence that plenty of fruit & veg is good ... the more variety the better.

Most of the studies suggesting that fats are bad go back many years to a study that was sponsored by a sugar-producer. Most fats in moderation are fine. Too much sugar, especiually refined sugar, is a bad idea. There's increasing evidence that artificial sweeteners cause the body to get confused and overcompensate. We drink soft drinks, usually with those artificial sweeteners, but we dilute them with water and we have been gradually increasing the amount by which we dilute.

My gran's advice still seems to hold well: "Moderation in all things, a little of what you fancy does you good". Mind, both my grans died young, so maybe that advice isn't so great after all.

Jazz relative beginner, starting at a much older age than was helpful.
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