Again, under the assumption that health is poor today - of course, save infectious disease - owing to our systems being hacked by poor habits, we would want to search for good habits and remove bad ones.
For those familiar with Taleb, the process applicable here is Via Negativa.
“The principle that we know what is wrong with more clarity than what is right, and that knowledge grows by subtraction. Also, it is easier to know that something is wrong than to find the fix. Actions that remove are more robust than those that add because addition may have unseen, complicated feedback loops.”
In other words, you at least remove the stuff that is harmful rather than trying to find the next superfood. For instance, it will be hard to find someone who would argue against removing(reducing a lot) sugars from one’s diet. Doing that is more reliable than adding kale or quinoa as the magical fat cutting thing in your diet.
The idea is, by repeated culling of poor things, the hunger and satiety feedback look that is hacked by processed and sugary foods, is restored to its regular sensitivity, giving us access to evolution’s 100,000 year old machinery designed to keep us healthy.