Earlier quoted context omitted.
Its not about eating healthy food, obesity is about the over consumption of food. You can maintain a healthy weight eating hamburgers and fries every day. The problem is portion size.
You might be able to maintain the correct weight, but you sure as hell won't be healthy. Vegetables are indispenable for good health.
On mouse models, these high fat high protein diets have improved brain functionality. http://www.cell.com/cell-metabolism/fulltext/S1550-4131(17)3...
Biggest issue effecting health is obesity which puts strains on your internal organs.