When I was young and hadn't been diagnosed with Crohn's I was struggling to eat much and my weight was around 9 stone (I'm 5'11"), I went to one doctor who suggested I needed to eat more butter on my sandwiches and add fat to meals. What a complete idiot.
My definition of a jogger is someone who reluctantly runs because they feel they should to help lose weight, or just so they can say they run, but they don't actually enjoy it at all. Whereas, a runner is someone who will run for the sake of running, regardless of any of the other benefits.
My club captain used to go into the same paper shop each morning after his run and the shopkeeper once said to him "do you enjoy running?" he replied "yes" and the shopkeeper said "why do you always look so effing miserable then?"