"Longevity and health were optimized when protein was replaced with carbohydrate to limit compensatory feeding for protein and suppress protein intake."
http://www.cell.com/cell-metabolism/abstract/S1550-4...(14)00065-5

Low Protein Intake Is Associated with a Major Reduction in IGF-1, Cancer, and Overall Mortality in the 65 and Younger but Not Older Population.
http://www.ncbi.nlm.nih.gov/pubmed/24606898

Fat generally — and saturated fat specifically — came to be blamed for causing heart disease, obesity and cancer. Eventually this unfounded belief became ingrained as our national dogma.

Saturated fat is really not bad for health. The most rigorous diet trials clearly show that a high-fat, low-carb diet is better for fighting obesity, diabetes and heart disease

Fat generally — and saturated fat specifically — came to be blamed for causing heart disease, obesity and cancer. Eventually this unfounded belief became ingrained as our national dogma.

Saturated fat is really not bad for health. The most rigorous diet trials clearly show that a high-fat, low-carb diet is better for fighting obesity, diabetes and heart disease."

"there is no significant evidence for concluding that dietary saturated fat is associated with an increased risk of CHD or CVD."
____________________

CONCLUSIONS
Among persons at high cardiovascular risk, a Mediterranean diet supplemented with extra-virgin olive oil or nuts reduced the incidence of major cardiovascular events.

We can’t tell people to stop eating all meat and all dairy products. Well, we could tell people to become vegetarians. If we were truly basing this only on science, we wouls, but it is a bit extreme.