Improving your diet can seem like a lofty goal, one that people often think requires rigid self-discipline and sacrifice. Cupcakes out, pizza out, treats out, sigh. But it doesn’t really have to be that way. Sometimes making better decisions for your body can be about adding — not taking away. This may create a more palatable option for those looking for a health boost that feels like a bonus, not a burden. But what to add? I asked Teresa Fung, adjunct professor in the department of nutrition at the Harvard T.H. Chan School of Public Health for her advice on what foods pack the biggest nutritional punch to a daily diet. Below is her list of five well-balanced options that she says you should eat every day — or at least as often as possible.