This article is from the Diet FAQ, by Claudia McCreary cookignnewsletter@chef.net with numerous contributions by others.
Continue whatever you did to lose it. Phrasing it another way, don't do
anything to lose it that you aren't willing to continue as long as you want
to keep the weight off (e.g., forever). For the overwhelming majority of
people, weight lost on fad or crash diets is regained within a matter of
months or years, leading to yet another fad diet, weight loss, weight
regain, etc. (a pattern commonly known as "yo-yo dieting"). There is
anecdotal evidence that repeated weight loss/regain make it more difficult
to lose weight each time--presumably because your body comes to believe that
it is encountering famine situations and becomes more and more adept at
hanging on to whatever calories are present--and that the stress of repeated
dieting may have other adverse affects. A 1988 study of over 11,000 Harvard
alumni found markedly higher death rates from cardiovascular disease among
male alumni whose weights had changed significantly (up or down) between the
early 60's and 1977.
 
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