The point being that humans are generalists: diet, activity, everything. There is no one perfect diet that works for everyone. The mess of evolution has left us

The point being that humans are generalists: diet, activity, everything. There is no one perfect diet that works for everyone. The mess of evolution has left us with intestines and behaviours that will generally keep us alive for as long as possible under most circumstances. "Eat food. Mainly plants. Not too much." "Specialisation is for insects." Both those quotes are trite and not without problems, but these are the Occam's razors I'd take to most discussions of diet and lifestyle choices.