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Weight Watchers International is an international company based in the United States that offers various products and services to assist weight loss and maintenance. Founded in 1963 by Queens, New York, homemaker Jean Nidetch, it operates in about 30 countries around the world, generally under names that are local translations of “Weight Watchers”. The core philosophy behind Weight Watchers programs is to use a science-driven approach to help participants lose weight by forming helpful habits, eating smarter, getting more exercise and providing support.〔(【引用サイトリンク】title=Helping People Lose Weight for 45 Years )〕 At 12 months Weight Watchers is associated with 2.6% more weight loss than those who were in a control group.〔 The term ''weight-watcher'', in the same sense, had circulated publicly for several years before the company was formed.〔(【引用サイトリンク】title=Menu from Stouffer's restaurant, probably Chicago, dated November 7, 1959: "Weight-Watcher's Luncheon ... $1.20." )〕 ==Effectiveness== A 2015 systematic review found that at 12 months Weight Watchers was associated with 2.6% more weight loss than those who were in a control group.〔 There is a lack of evidence beyond this period of time. Weight Watchers claims that members who both use Weight Watchers’ Web-based eTools and attend meetings lose half again as much weight as those who only attend meetings, citing an unspecified “12 week study comparing people who were instructed to attend Weight Watchers meetings and use eTools to people who were instructed to attend Weight Watchers meetings alone”.〔 〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Weight Watchers」の詳細全文を読む スポンサード リンク
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