Well, nutritional science doesn’t have a great track record. While a lot of bullshit is justified using the word “holistic”, it is also true that nutrition and in general our metabolism are affected by so many factors that a reductionist approach to nutrition more often than not fails to give actionable insights, especially if you move away from very broad statements. It doesn’t help that every few years, some core concept of nutritional science is discovered to be the result of lobbying.