About a month later , I shot up 20 lbs over a two week period . I was dieting and exercising at the time , so I checked my weight weekly . Nothing was wrong with the scale , I ' ve checked it elsewhere and everyone else in my house has used it and seen no changes .

Question: What may have caused you to gain 20 lbs ?
Answer: I stopped exercising at the time .I ca n't determine the reason .I messed up my diet .Something was wrong wit the scale .