A billion Hindu adherents in India say it's wrong to eat beef. A billion Muslim adherents world wide say it's wrong to eat pork.
When does majority vote constitute scientific proof of anything?
There's enough anecdotal evidence to stir doubt among the medical community that eating "low fat" is actually having the opposite effect.
I know enough people who have dropped carbs and eat "the caveman diet" that it convinced me that sugar is dangerous and fat is not.
Why do you think farmers feed grain and potatoes to animals?
(Hint: it ain't to make 'em skinny)