(Tom: Here is another survey highlighting the unsustainability of a vegan diet.)
Identical twins Hugo and Ross Turner spent 12 weeks on opposite diets—one vegan, one omnivorous—under scientific supervision to compare real health impacts.
Hugo on the vegan diet lost 4 pounds of fat, gained mental clarity, but experienced a notable libido drop.
Ross eating meat gained muscle while also gaining some fat, with unchanged cholesterol levels and stable gut health.
The vegan diet reduced gut microbiome diversity while the omnivorous diet maintained it, highlighting the importance of dietary variety.
Both twins concluded that the best diet blends plant-based and animal foods rather than choosing one extreme over the other.