That seems like wishful thinking, IMO. Seems more likely we will find it’s due a complex constellation of genetics, diet, lifestyle factors like exercise, environmental exposure, etc associated eith a modern sedentary lifestyle with no clear smoking gun or single preventative intervention.

It sort of reminds me of when Lesswrong was fixated on a hypothesis that lithium levels in the water supply was the cause of the obesity epidemic. There was a lot of enthusiasm for the idea at the time, and somewhat understandably as it would have been a single variable that could be tweaked for massive societal benefits.

But there wasn’t really any credible evidence to support it. Trying to reduce the complexity of human biology and lifestyle to single cause/effect relationship is an easy and tempting trap to fall into to explain unknowns in medicine.