You may have to expand it to non WLS big losers or even to any people looking to get control of their diets and bodies and health such as those fighting diabetes with diet, fitness. Although it would be nice to have enough bariatric patients the number of woman vs men is so high on the female side. Anyone who has lost a lot of weight or struggling with diet and exercise has the same issues with choosing the right foods, exercising etc even if no surgery. They just shouldn't join if they dont want to meet anyone who had WLS! It would sort of be a myfitnesspal for dating.
Just a thought that you may need to think about in future...