Earlier quoted context omitted.
There is a standard of reasonableness - i.e. if the diet and exercise program results are reasonably good. Good health doesn't have to be an exact science. Forgoing processed foods, forgoing too many calories, and taking a daily walk is sufficient for the average person. The questions you are asking here only matter at the extremes (professional athletes, et. al.), not to the average person.
No, that's my point. You're projecting your definitions of "sane", when there are thousands of choices to make. Avoiding processed foods isn't "simple", and who has decided a daily walk is sufficient?
But have it your way in the mire of pedantry you've carved out for yourself.