When he was first starting his physician training, Dr. Adam Perlman had a daily ritual: ordering a very sugary coffee. "I'm from Boston, so I'd go to Dunkin' Donuts and drink my coffee with cream and three sugars," Perlman, 59, told Business Insider. Now an integrative and functional medicine doctor and former chief medical officer for Mayo Clinic's integrative medicine program, his habits changed as he learned more about his health. "I went from cream and two sugars, to cream and one sugar, to