And yes, food research is very problematic. Some reasons are valid, for example we will probably never have randomized double blind placebo control study on various food intake patterns which lasts years or decades because it would cost too much and is very hard to do. But we can draw at least some conclusions based on the weight of evidence that we have. My only "problem", setting anecdotes aside, is that people jump on latest trends and make a cult out of it, when there are not even low quality observational studies to support what they claim. For example lately carnivore diet pops up too often with magical claims.
There are differences between people, and some will thrive on some diets where others would be miserable. But that is why we need to find the biggest common ground for all of us first then optimise on differences. Cut all the fluff and pointless optimisations in the beginning, first stick to the most basic things : eat real food, move moderately, sleep well, don't drink alcohol or at least not too often or daily, try to be less reactive (less stressful), do it for a few months and then try to optimise for your ticket in the gene lottery.
