On a diet? Eat these foods, experts say - and make sure they feel right for life. You should like them. Enjoy them. Wish them. "When food needs decrease, it's easier to stay within a calorie deficit to lose weight," says Melissa Mitri, MS, RDN, owner of Melissa Mitri Nutrition, LLC. Your body also needs to work harder to break down protein than carbohydrates or fats, which burns more calories. The best "diet" is one that you can maintain for life, where you…