The current standardized value for weight for height is a BMI of between 18.5 and 23.9 for that individual. In medicine, a healthy weight is referred to as standard weight or ideal weight, which is the weight that maintains normal vital body functions at a certain height and age. This weight is a range rather than a fixed value. Internationally, the Body Mass Index, or BMI, is often used to measure whether an individual’s weight and height is a healthy weight, which can vaguely reflect the percentage of body fat in an individual’s body weight. BMI is calculated by dividing weight (kg) by the square of height (m), and the result of BMI is divided into four classes: underweight, normal, overweight and obese. According to the actual situation in China, a BMI of less than 18.5 is considered underweight, between 18.5 and 23.9 is a healthy weight, between 24 and 27.9 is overweight, and greater than or equal to 28 is obese. Therefore, the standard value of weight and height is BMI between 18.5 and 23.9. Standard height and weight is an important symbol reflecting a person’s health, too thin or too fat are not conducive to the health of the individual. Therefore, it is important to eat reasonably in daily life to keep the weight within a reasonable range.