Natural foods are much safer for blood sugar,  less worrying than artificial sweeteners. Most of these are usable in smoothie and congee.

• monk fruit 罗汉果 juice .. no fructose at all. (Reminder! excessive fructose might be harmful, but whole fruits are a much safer source of fructose)
• honey .. yes better than sugar, but please limit honey intake
• Stevia leaf .. you can find IT on packaging
• Persian dates .. proven for my congee