填空题 People who want to avoid weight gain have to balance the number of calories they eat with the number of 1 . To lose weight, you can reduce the number of calories you 2 , or increase the number you use, or both.
Experts at the National Institutes of Health say 3 , a person should do an hour of moderate to intensive physical activity most days of the week. This could include 4 , sports or strength training. You should also follow a 5 and take in fewer calories than your body uses each day.
A recent study 6 four of the most popular dieting plans in the United States. Researchers at Stanford University in California studied more than 7 women, mostly in their thirties and forties, Each woman 8 one of the four plans: Atkins, The Zone, Ornish or LEARN. The women attended diet classes and received 9 about the food plans. At the end of a year, the women on the Atkins diet 10 the most, more than four and one-half kilograms 11 . They also did better on tests including cholesterol levels and 12 .
Christopher Gardner led the study, reported in the Journal of the American Medical Association. He says the Atkins diet may be 13 because of its simple message to lower intake of sugars. Also, he says 14 increase protein in the diet leads to more 15 meals. He says there was not enough money to also study men, but that men would probably have 16 .
But last week, another report suggested that only 17 people have long-term success with dieting. The report in the journal American Psychologist was based on 18 studies. Researchers at the University of California, Los Angeles, medical school found that most dieters 19 their lost weight within five years. And often they gained back even more, But those who 20 generally were the ones who exercised.