Balding is often a sign of being unhealthy, though.
Discussion
Yup, that is fair. But in the above example the person seems to be in a good physical condition. That is not to say he cannot be unhealthy. But the chances are lower than in someone who does not at least look weak/fat.
Yes, you're right. The chances are definitely lower. But there are plenty of people that have great physiques and terrible insides.