After turning down several new drugs and restricting use of another, Dr. Vinay Prasad drew the ire of the right-wing influencer Laura Loomer and others.
The conglomerate was viewed as one of the most successful companies in America, but patients are enraged and investors have lost faith in its business model.
The study found that a combination of exercise, healthy diet and other behaviors led to cognitive benefits. How much intense guidance is required was unclear, experts said.
The restaurant mistakenly used oil infused with THC, a psychoactive ingredient found in many cannabis products, in food preparation last year, the C.D.C. said.
