About 7 months ago I gained 20 lbs in 2 months.. I went to the doctor and he gave me some diet pills which helped. I had just turned 31 and believe it or not your body changes dailey. You may be retaining alot of water. Go to health store and buy some antioxidants (to flush out toxin) and water pills(to help bloating). You may not have changed what you eat but pay attention as to "how" much your eating.