There is a genetic component to disinterest in sweet food. It quite evidently runs in some families. These are people who never eat any sugary food or often even fruit regardless of availability because they actively dislike things that taste sweet. It isn't a matter of environment or self-control. To them, a donut is about as enticing as a bowl of plain oatmeal.

Anecdotally, people that don't eat any sweet food always seem to gravitate toward salty/bitter flavors instead.