It's called eating well, exercising and losing a significant amount of weight.
I know, I came very very close to having it. Break the sugar addiction, quadruple your vegetable intake, vastly reduce your sugar / heavy foods intake and do a little, tiny bit of basic light exercise.
In a couple of years, guess what,...?
This is absolutely terrible medical advice. Decades of research shows it has a terrible success rate, and, of those who it works for, 95% it eventually fails long-term.
If this advice were a pill, the FDA would never approve it, and people like me and probably you would call it a scam.