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Sam was very overweight before. He weighed about 110 kilograms. He used to eat a lot of fast food, drink sugary drinks, and never exercise. He often felt tired and had problems walking long distances. At school, he didn’t like sports, and he sometimes felt sad about his body. One day, Sam went to the doctor. The doctor told him, “You should change your lifestyle. You should eat healthy food and exercise regularly.” At first, it was difficult for Sam, but he decided to try. He started eating mo