“If you’ve ever stepped on the scale and wondered, ‘Why am I gaining weight so fast?”, know that you’re not alone,” assures Sean Bourke, MD, Founder and Chief Medical Officer of JumpstartMD.

When you start exercising, the hormone that controls appetite—ghrelin—goes down, which means you don’t feel very hungry. At ...

Weight fluctuation happens daily, week to week, or month to month. Learn about causes and when to see a healthcare provider about weight changes.