Keeping a food diary is a powerful tool in helping dieters lose weight, scientists said yesterday. Those who compiled a detailed account of what they ate and drank and the calories it contained lost about twice as much weight as those who did not, they found. The six-month study involved 1,685 middle-aged men and women from four U.S. cities – Portland, Oregon; Baltimore, Maryland; Durham, North Carolina and Baton Rouge, Louisiana. Model behavour: Renee Zellweger's character famously recorded her meals Their average weight loss was about 13lb. But those who kept food diaries six or seven days a week lost about 18lb compared with 9lb for those who did not. Those taking part in the study, whose average age was 55, were asked to eat less fat and more vegetables, fruit and whole grains. They were also told to exercise for three...
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