Around age 40 I put on twenty pounds. I had always had a perfect metabolism. But, my metabolism betrayed me as it does most people, except a very rare few who will always be thin. ↗
My advice is to give up stevia, aspartame, sucralose, sugar alcohols like xylitol and malitol, and all of the other heavily-used and marketed sweeteners unless you want to slow down your metabolism, gain weight, and become an addict. ↗
While weight loss is important, what's more important is the quality of food you put in your body - food is information that quickly changes your metabolism and genes. ↗
A trick I've learned is to eat just a little bit of something that has no carbs and no sugar in it before you go to sleep because it keeps your metabolism going. ↗