The benefits of eating more because of an increase in physical activity are not widely appreciated．Many people in this country, by actual measurement, have remarkably low calorie intake．Often the amount is so low （1200 to 1800 calories a day） that nutritionists worry about the adequacy of their vitamin and mineral intake．And too little food, with inadequate fiber content, leads in the old population to chronic constipation（长期便秘）．

　　To sum up, most Americans still get too little regular exercise, and it is within this group that almost all obesity is found．Severe dieting should not be used as it is unpleasant and tends to be self-defeating．Moderate dieting combined with regular exercise is much more effective and enjoyable．The choice is yours: life on the sofa, nibbling celery or the active, robust-eating, healthful way．Title Eat more,Play more---Weight less

　　Causes of weight problems ●It’s commonly believed that adults’ weight problems are due to (71)______ too much,but little scientific evidence (72)_______ this idea.

　　●Studies show that fat people eat less and are (73)_______active than slim people.

　　(74)_________ of eating enough ●Energy used for essential bodily functions,BMR,and (75)_________ activity should be balanced by food intake for weight to remain stable.

　　●Food intake offers (76)_______ vitamin and mineral intake and prevents the old from chronic constipation.

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