I have an ex who is a mesomorph (somatotypes). Which means he looks like an athlete no matter what. One of those people who look healthy and fit naturally. He eats what he wants, works out when he wants, stops working out for months at a time, and still keeps 6-pack abs, toned arms, etc. Having said that, he is not healthy. When we were together, he constantly struggled with his oral health. Which is certainly a symptom of other things afoot in the body. While his smile was dazzling and bright, with naturally straight teeth (whereas I had to go the adult braces route), he was regularly going in to have root canals and other oral surgeries performed. So yeah, having a fit-looking facade does not mean you are healthy.
Thank you for sharing your experience.