A doctor and a consumer group have sued KFC in an effort to stop the chicken chain from cooking with high-fat oil.

"KFC ... recklessly puts its customers at risk of a Kentucky Fried Coronary," Jacobsen said.

Hoyte and the consumer group are seeking class-action status for the lawsuit and asking a judge to let Hoyte represent anyone who ate at a Washington, D.C.-area KFC in 2004 and 2005.

"If I had known that KFC uses an unnatural frying oil, and that their food was so high in trans fat, I would have reconsidered my choices," Hoyte said.

Dr. Hoyte said he is suing to force KFC to change its cooking practices "for my son and others' kids, so they may have a healthier, happier, trans-fat-free future."