"I used to eat bran muffins, raisin bran, whole wheat bread, and brown rice and I thought that was healthy, because that’s what I learned," says Dr. Tru Kalijian, a board-certified internal medicine physician, who weighed 350 pounds at the time he delved into nutritional science. Kaligian began analyzing data on diets for weight loss, obesity, diabetes, prediabetes, and high blood pressure, as he would for any other condition, and found that "One after another, low-carb diets got better".