A dietician friend once told me that a good rule of thumb is: 100 to 110 pounds for the first 5 feet of height, and then 5 pounds for each inch above that. So for a person 5'7'' tall, using this rule, she would say that a good target for you would be 135-145 pounds. Of course, this is a very general rule, not taking into account different body types, body fat percentage, etc.
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