I discovered the sucralose in a protein powder I was using was giving me migraine headaches. It took about a week (and suffering with the headaches for that week) to discover that was the source. I had been eating so clean for quite some time, using no sugar or artificial sweeteners for that time, that it really screwed up my body and took a while to recover.
I had to search for products with Stevia. I have been using Stevia for about six months and really like the product. Some Stevia has a bad aftertaste, but a good Stevia product does not. Trader Joe's makes a good version. I found an all natural protein powder, the Elite all natural Whey Isolate, that is sweetened with stevia, is not too sweet and tastes great. I feel much better after switching over.
Stevia does not raise your glucose level, therefore does not involve your insulin. It's a good sweetener for losing fat. I've lost about 25 pounds of fat in about 4-5 months, eating non-processed good foods and sweetening my coffee, oatmeal, etc. with Stevia.