Take your present eating habits into account, says Maxine Smith, a registered dietitian with Cleveland Clinic's Center for Human Nutrition. Which positive habits do you already have and wish to continue? Which dietary changes are realistic to make with your available resources and lifestyle? "The right diet for you will include a wide variety of foods, with an emphasis on whole or minimally processed foods, and fit into your schedule and lifestyle," says Carrie Dennett, a Pacific Northwest-based registered dietitian nutritionist and owner of Nutrition by Carrie.