Red lentils are a good source of iron and magnesium. Red lentils are perfect for those watching their calorie intake. One bowl of cooked dal contains only 168 calories. Red lentils serve as a good source of vitamins, espeRed lentils are a good source of iron and magnesium. Red lentils are perfect for those watching their calorie intake. One bowl of cooked dal contains only 168 calories. Red lentils serve as a good source of vitamins, especially, folate, which is a type of B vitamincially, folate, which is a type of B vitamin