If a whole family adopts healthy lifestyles, teenagers will easily learn to follow. Parents should encourage everyone to eat more healthy foods (such as vegetables, fruits, whole-wheat foods, oatmeal, etc.), and also participate regular physical exercise. Healthy family lifestyles should also include healthy entertainment time. Family entertainment should be in moderation - excessive watching TV or playing digital games should be limited.
When in school, teenagers should avoid any unhealthy foods. Parents can help them choose healthy foods and snacks. If possible, they should avoid high-fat fast foods and sugary drinks.