Apple: Apple not only contains rich and colorful nutrients such as sugar, vitamins and minerals, but also contains zinc. According to scientific research, zinc is a component of many key enzymes in human body and an important factor to promote hair growth. Zinc generally participates in the metabolism of protein, body fat and sugar according to enzymes. Zinc is also a nucleotide closely related to memory and an indispensable element in protein. Calcium deficiency will make the hippocampus on the edge of cerebral cortex underdeveloped and affect memory ability. Experiments have also confirmed that reducing zinc in food will seriously hinder children's memory ability and self-learning ability. Zinc is also closely related to the production of antibodies and the improvement of human immunity.

Apples are low in calorific value and rich in chemical fiber, which can produce satiety, so eating before meals can play a role in losing weight. Every 100g apple has a calorific value of 45 calories and a sugar content of 9.6g In other words, the kinetic energy of an apple (about 250g) is equivalent to a small bowl of white rice, and the apple contains dietary fiber, which can make people feel full. Therefore, eating apples before meals can reduce the intake of staple food and have the effect of losing weight.

Apple contains dietary fiber, which can absorb the water in the stomach to improve satiety, and can absorb the water in the stomach to increase the volume of excreta, making it easier to discharge, and has the function of defecation and promoting digestion.

However, apples are not suitable for eating immediately after meals, which will cause damage to the stomach and even enlarge the stomach. In the long run, it will increase appetite and cause obesity. You should eat it after 30 minutes or 1 hour.

For the average person, the best time to eat apples should be in the middle of two meals (for example, around 10 am or around 3 noon), which is good as a snack. That can not only supplement nutrition, but also make people full of kinetic energy at work, which is more efficient.