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no ,not even starving yourself will make you lose 20 lbs in 3 weeks.a normal goal for weight loss is 2 -3 lbs a week .the best way to lose weight is to eat healthy and exercise.count your calories and write down everything you eat and what you did for exercise.not counting calories can be a prob and you tend to underestimate exactly how many calories you have consumed.

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15y ago

What else can I help you with?