This article is from the Diet FAQ, by Claudia McCreary cookignnewsletter@chef.net with numerous contributions by others.
It's possible; many dieters (especially women) avoid exercise at first and
rely on low-calorie diets for weight loss. However, these same dieters often
find that exercise can be the key to restarting weight loss that has
suddenly stopped (see the section on plateaus), and most people who
successfully maintain their new weights find that exercise is a necessary
component of a maintenance plan. Another benefit of exercise (especially
anaerobic exercises such as weight lifting--see section on "What is
anaerobic exercise?") is that it can increase the amount of muscle tissue in
your body--the more muscle you have, the more calories you burn.
 
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