I think so, when I am ill. My sweat might smell different, or my breath. But I am not that superhuman. But there are some bad people smell that kind of repeat themselves. But I did not investigate these things. I know animals can detect some illnesses, maybe through smell.

The sense of smell also affects the taste. I can taste a lot of ingredients in an unknown dish. I also cook very well, maybe because of that. When I got Covid and the sense of smell went for a while, food tasted like nothing. It was kind of horrible to have to eat. I would focus on textures and spiciness.