Amen to this.
The problems with nutrition science begin with how most of its research is conducted. The vast majority of nutrition studies are observational in nature -- scientists look at people who eat certain foods and examine how their health compares with the health of people who don't eat those foods or eat them at different frequencies. But as I reported earlier this year, these sorts of studies have a high chance of being wrong. Very wrong.
What we need, pronto: "Precision weight loss based on genetics may be future of dieting". (See also "The ‘DNA diet’ could be a game-changer for losing weight".)