A member asked:

What to do if i started exercising and lost 5 pounds in a week, is it bad?

A doctor has provided 1 answer

Fluid losses: It is very difficult to truly lose 5 lbs. In a week. To do so, you would require a 17, 500 calorie deficit (3, 500/pound). Most likely you were retaining fluid and now have lost that excess, or are now in somewhat of a dehydrated state. Losing one pound each week is realistic and safe.

Answered 2/27/2014

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