The standard weight for a boy of 178 is around 68.6 kg, calculated according to the WHO standard weight of (height – 80 cm) * 70%. In this range up and down 10% of the weight difference fluctuation, are within the normal range, too fat or too thin on the health of the body may have a negative impact. 1. Too high weight: Excessive weight can cause metabolic diseases such as high blood pressure and high blood cholesterol. 2. Too low a weight: Too thin a weight can lead to insufficient protein storage in the body, resulting in hair loss, dull skin, etc., and may also be due to malnutrition symptoms such as anemia. Maintaining a standard body weight requires a reasonable diet plus long-term exercise, not dieting as a means of losing weight. If your weight is too different from the standard weight, you may consider going to the hospital for a full checkup to find out why you are overweight or underweight, and then manage your weight healthily under the guidance of your doctor.