5 Foods to Keep When You Diet! As a dietitian, I’m always hearing about foods that people think they should avoid when they diet. But dieting means deprivation. And deprivation, in most cases, does not lead to weight loss success. At AppforHealth.com we encourage balance and variety — and sanity! Many foods get put on the ‘diet don’t’ list for no good reason. Here are some foods that you can put back on your plate — in moderation of course — even if you are aiming to slim down this new year.