In my experience the most effective diet of all is vegan, non-GMO, gluten-free. Not that there's anything special about that combination, but good luck scroung

In my experience the most effective diet of all is vegan, non-GMO, gluten-free. Not that there's anything special about that combination, but good luck scrounging together more than a handful of calories in the course of each day about town! EDIT: what I mean is if society had such options plentifully available it would negate the effect. So it is similar to a diet where you can only eat foods beginning with the letter 'A'. If it's harder to meet some arbitrary criterion, it will reduce your caloric intake.