Erythritol is a natural sugar alcohol that can't be metabolized by the body. It's listed as carbohydrate on the nutrition label because that's what it is, but basically it has zero caloric value, no impact on insulin, and is basically just absorbed in the gut, then excreted in the urine completely unchanged. The entire family of sugar alcohols taste kind of sweet, but erythritol is used in Truvia because larger molecule sugar alcohols like xylitol or maltitol can't be absorbed by the intestine and end up causing diarrhea.
1) eat real food - more vegetables, moderate meat, moderate fruits, less grains, less sugar, less vegetable oils.
2) exercise - moderate intensity cardio, sprinting, heavy lifting, dedicated stretching and mobility.
3) live - relax, de-stress, meditate.
Disclaimer: I'm not professionally qualified to make any formal recommendations. I've just done my homework and I'm my own guinea pig. All of my data, unless otherwise cited, comes from a sample size of n=1 (me).