Lifestyle intervention includes diet instruction and exercise intervention:

1. Diet instruction: The children were asked to increase fruit/vegetables consumption, reduce high fat food, etc.
2. Exercise intervention: The children participated sports 60 min/day,5d/week for 8 months.

No intervention in the group with "control".

Diet instruction for 3-4 times/semester,exercise 60min/day for 5d/week for 8 months.

Body weight will be measured with light clothes using a scale to the nearest 0.1 kg.

Body mass index is defined as the individual's body weight divided by the square of his or her height (height is measured using a non- stretchable tape suspended from the wall is recorded to the nearest 0.1 cm).

Waist circumference will be measured using a tape around his or her bare abdomen to the nearest 0.1 cm.

Blood pressure will be measured three times by auscultation method with appropriate cuff size after 20 minutes of rest.The average of the blood pressure measurements is defined as hypertension if it was >95th percentile according to their age, gender and height percentile.

Blood samples will be obtained in the morning by venipuncture after an overnight fast. Serum lipid profiles (total cholesterol ,triglycerides, low-density lipoprotein, high-density lipoprotein) will be measured using routine enzymatic methods.

Blood samples is obtained in the morning by venipuncture after an overnight fast. The glucose oxidase method was used in the determination of blood glucose levels.

Well-being will be measured by The WHO 5-item Well-Being Index (WHO-5), which is a short screening instrument for the detection of depression in the general population,