Benefits of Citrus Fruits They say an apple a day keeps the doctor away, but what about citrus fruits? Citrus fruits include lemons, limes, oranges, and grapefruit and other hybrids and varieties. And just like any kind of fruit, citrus fruits are an excellent source of vitamin C that strengthens the immune system, as well as fiber. Additionally, they also have helpful anti-inflammatory and antioxidant effects. Early …