Because (a) I've always been interested in science, (b) I am obsessed with learning about new developments in medicine, (c) I would love to help a person feel better who was suffering from a chronic disease, (d) I think I have the potential to be a very good doctor because of how interested I am in the field and how much time I'm willing to invest both during and after my formal education, (e) it's enough money to comfortably raise a family with, and (f) it provides tremendous opportunity to conduct research on new treatments, something I would like to be a part of.
Well I wish you good luck. Be sure to weigh the pros/cons of each career path that can get you to similar goals - MD vs PhD vs NP/PA. Is there a particular field of medicine that interests you the most?
I think chronic disease is really interesting, and I have a particular interest in using vitamin D as a potential treatment for certain chronic illnesses. Much of the vitamin D research has been observational research, and while it shows tremendous promise in preventing heart disease, certain cancers, and diabetes, more needs to be done to establish whether these diseases are caused by a deficiency, if so to what extent, and whether correcting this deficiency has a treatment effect.