According to Roth anon, they stay away from carbs, fast once in awhile, and don't drink much alcohol.
Anons, if any of you or loved ones suffer from diabetes type 2, look up water-only fasting. If you can summon a little bit of self discipline, you can be cured and off meds in about 6 months.
"Obesity Code"
Condolences, sorry for your loss anon.