LauriPatterson via Getty Images Bet you didn't know potatoes are a good source of vitamin C, which doesn't retain its value when reheated. When hunger strikes at home, the average person opens the fridge, pulls out some leftovers and nukes them in the microwave. This’ll do the trick to end your cravings, but if you’re thinking that food has the same nutritional value as it did the first time around, you could be wrong. That’s because certain foods don’t retain their nutritional value when heated a second time. According to board-certified nutritionist Serena Poon, “The more you reheat and refrigerate your food, the more chances you have for bacteria growth and nutrient, flavour and texture loss.” Though many foods many initially lose some of their nutrients upon being cooked the first time, additional reheatings only further weaken the presence of those nutrients.