> Red meat and saturated fat is terrible for you!
Red meat is a little bit bad for longevity. The majority of the reported effect is correlative.
> it's actually sugar that's evil.
Sugar is bad but mostly because it's easy to overeat, and obesity is all around terrible for health.
> Vegetables are great for you! Oh wait, most vegetables contain oxalates and other defense, mechanisms and compounds that are actually bad for you
Cooking removes most oxalates (tho vitamins too, to be fair). But the overall effect of oxalates is relatively minor, except in extreme cases.
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Every food source has advantages and disadvantages.
Not being obese is 75% of the health battle.