[youtube http://www.youtube.com/watch?v=OM6rB_585u4]   When we first met 4-year-old Sarah Landrigan on Sept. 17, we were introduced to a very special little girl with a very perplexing disease. (See related story) Sarah has Mitochondrial Disease, an illness that prevents her body from converting food and oxygen into energy efficiently. The disease also causes seizures, ketotic hypoglycemia, …read more.