Dr. Jeremy London sees first-hand what heart disease, the world’s biggest killer, can do to a person’s health. As a board-certified cardiovascular surgeon who operates on diseased hearts, he repairs damaged blood vessels and performs bypass surgery for clogged arteries. “That didn’t happen overnight in most people — it’s an accumulation of a chronic process,” London, who practices in Savannah, Georgia, tells TODAY.com. By adopting certain unhealthy habits, “you’re putting yourself at risk that you’re going to end up on my operating room table,” he cautions others. London keeps that warning in mind for his own heart as well, putting together a popular list he titled, “Things I avoid as a heart surgeon” on his Instagram page. Here are six...