The problem is generally that good sugar substitutes are laxatives. There is even an enantiomer of glucose. Which chemically behaves almost like normal sugar. I

The problem is generally that good sugar substitutes are laxatives. There is even an enantiomer of glucose. Which chemically behaves almost like normal sugar. It tastes exactly the same. But since your body can't break it down like normal sugar it's a laxative. I think this is the reason why all sugar substitutes we actually use are MUCH stronger then normal sugar.