The phrase "fat clogs" refers to the accumulation of excess fat in someone's body. It implies that the fat is blocking or obstructing certain functions or processes. Full definition
To reverse a disease, you have to understand it's cause and unfortunately the standard view of fat clogging an artery is sorely out of date. (drcate.com)
Coronary artery disease, the leading cause of death in the United States, results when fats clog the arteries that supply blood to the heart. (sciencemag.org)
I believe his theory that it is the visceral fat clogging up the beta cells. (idmprogram.com)