Runner's World reports on feeling bloated while running. Since exercise acts as a stressor, it can trigger your adrenal gland to release the stress hormone cortisol.

"We secrete cortisol in times of stress—for example, a hard run or a stressful job will both increase cortisol levels," says Tiffany Chag, MS, RD, CSCS, sports performance specialist and sports dietician at HSS.

Chag explains that the spike in cortisol promotes the production of glucose by the liver for ready-to-use energy, the breakdown of muscle protein into amino acids that are then converted to glucose for energy, and the secretion of glucose into the bloodstream for ready-to-use energy.

Read the full article at RunnersWorld.com.