1. weight control: high-fat foods usually contain high calories, and excessive intake can easily lead to weight gain. In the process of fitness, controlling calorie intake is helpful to maintain or lose weight.

2. Reduce fat accumulation: High-fat foods can easily lead to fat accumulation in the body, especially under the skin and internal organs. Reducing the intake of high-fat foods will help reduce fat accumulation and improve health.

3. Reduce the risk of cardiovascular disease: Eating too much high-fat food may lead to an increase in blood lipids and increase the risk of cardiovascular disease. Reducing the intake of high-fat foods helps to reduce the risk of cardiovascular disease.

4. Improve sports performance: High-fat foods may lead to a decline in sports performance, because the body needs to consume more energy to digest and absorb these foods. Reducing the intake of high-fat food can improve sports performance and help the body to exercise better.

5. Promote muscle growth: Proper intake of protein is very important for muscle growth, and high-fat foods may affect the absorption of protein. Reducing the intake of high-fat foods can increase the intake of protein, which is beneficial to the growth and recovery of muscles.

In short, fitness needs to reduce the intake of high-fat food, mainly to control weight, reduce the risk of cardiovascular disease, improve sports performance and promote muscle growth. Low-fat and high-protein foods should be selected in diet to ensure fitness effect and health.