Nutrition: Cherry tomatoes pack a lot of nutrients without many calories and no fat. One cup of cherry tomatoes contains about 27 calories. They’re also an excellent source of dietary fiber, vitamins A, C and K, potassium and manganese. In addition, cherry tomatoes are rich in vitamin E (particularly alpha-tocopherol), thiamin, niacin, vitamin B6, folate, magnesium, phosphorus and copper. Their abundant antioxidants contribute more benefits. Lycopene, for example, helps promote prostate health.