Are we really “all different”?

Here is a commonly held belief regarding diet: “We are all different (Bio-individuality) and there is no one diet that fits all. I find this conclusion quite puzzling, because,

Find the right eating plan

Virtually everyone in this country is participating in a dietary experiment to see if their food choices are in alignment with their evolutionary heritage. The penalty for guessing wrong might not become apparent for decades.

“Bio-individuality” Are we all different?

Bio-individuality, as applied to diet, is a widely accepted concept, concluding that there is no one diet that fits all. I find this conclusion quite puzzling, because, for every other living species on the planet, there is at least one diet that does fit each and every member.