填空题 Being obese is more than being{{U}} (1) {{/U}}. To determine if someone is obese, doctors and other{{U}} (2) {{/U}}professionals need to measure a person's{{U}} (3) {{/U}}and weight. People gain weight when the body takes in more{{U}} (4) {{/U}}than it burns off. Some of your{{U}} (5) {{/U}}tell your body how to metabolize food. Sometimes{{U}} (6) {{/U}}can fuel obesity as well. One important factor in weight gain is a{{U}} (7) {{/U}}lifestyle, as people are much less active today than they used to be in their spare time. According to the World Health Organization, about{{U}} (8) {{/U}}billion people in the world are overweight and at least 300 million of them are{{U}} (9) {{/U}}, even though obesity is one of the 10 most{{U}} (10) {{/U}}health risks. In the United States, women are slightly more at risk for becoming obese than men. Race and{{U}} (11) {{/U}}also can be factors. Obesity makes a person feel tired and{{U}} (12) {{/U}}, and is also associated with{{U}} (13) {{/U}}problems such as{{U}} (14) {{/U}}and sleep apnea. People who ate obese are more likely to be{{U}} (15) {{/U}}, which can start a vicious cycle. The keys to healthy weight are regular{{U}} (16) {{/U}}and good{{U}} (17) {{/U}}habits. You may also want to keep a food and activity{{U}} (18) {{/U}}. You might also want to consider attending a{{U}} (19) {{/U}}group. Above all, surround yourself with{{U}} (20) {{/U}}and family who can help you tackle these important changes in your life.