11 Store-Bought Staples Nutritionists Swear By By: Toby Amidor, M.S., R.D., C.D.N. Save Collection Share It doesn't have to be homemade to be healthy. 1 / 12 Photo: Getty Images Store-Bought Staples Everyone has a go-to store-bought item in their kitchen — even dietitians! Here’s a list of 11 items registered dietitian nutritionists (RDNs) from around the country always have on hand.