My understanding is that sugar alcohols, to varying degrees, pass through the intestinal tract without being absorbed.

Glycemic Index of Sweeteners

Stevia Glycerite = 0
Swerve = 0
Erythritol = 0
Allulose = 1
Yacon = 1
Xylitol = 7
Maple Syrup = 54
Honey = 62
Table Sugar = 68
Splenda = 80
HFCS = 87

http://mariamindbodyhealth.com/guid...ral-sweeteners/

(Wow, Maria is looking thin these days. In that one pic you can see her ribcage in the v-neck of her tank top, which is hanging on her.)