That's scientifically incorrect on so many levels

Omnivorous adaptations seen in humans include our teeth structure, dexterous hands, and historical ability to adapt to nearly any environment.

Herbivores usually have adaptations like cellulase, ruminating, and coprophagia to cope with digesting plant matter. They also consume meat in many cases.

Biological meat eaters don't get heart disease and diabetes from eating meat, for example.

You should go and tell vets so they're aware too.

We are omnivores.

The only reason why we experience those diseases is because we eat too much meat as an omnivore.

If you don't have to harm vulnerable individuals to be happy and healthy, then why do it

almost no one does that

Biological meat eaters don't get heart disease and diabetes from eating meat, for example.

Humans do not get diabetes (type 2 the most common) from eating meat, it's a direct result of pernicious carbohydrate consumption

The same for heart disease

That would be a logical fallacy, anyway

it depends on how it's used