On the premise of ensuring nutrition, simplifying diet should start with the efficacy of food. Apples, grapes, oranges and bananas are also called the four major fruits in the world, among which apples are the most consumed fruits in the world. In addition to promoting fluid production and quenching thirst, apples can moisten the lungs and relieve annoyance, invigorate the spleen and stomach, nourish the heart and replenish qi, lower blood pressure and help digestion.