When trying to start a good diet, you want to do a good job controlling our diet. Three characteristics of a good diet can include balancing the amount of calories you take in my the foods you eat. This can help manage his weight better if he really focuses on it. Another way could be consuming healthier foods such as fruits, vegetables, and whole grain, fat free foods, etc. Finally, he should try consuming less foods that contain lots of salt, saturated fats, trans fats, etc.
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