Regarding the Nov. 27 Health and Science article “Humans aren’t naturally inclined to be vegetarians”:

It doesn’t take a genius to figure out that it’s time to give up meat if the human race wants to keep evolving. Meaty diets are detrimental to the health of the modern human brain. Red and processed meats increase the risk of stroke, according to the American Heart Association. And researchers from the Harvard Nurses’ Health Study found that fatty foods eaten during midlife may accelerate cognitive decline. Other studies have shown that the risk for Alzheimer’s disease is greater in people who have diets high in cholesterol and saturated fats.

The smart choice: Put down the Big Macs and pick up plant-based brain foods.

Ulka Agarwal, Washington

The writer is chief medical officer and director of clinical research at the Physicians Committee for Responsible Medicine.