What is the difference between natural xylitol and 100% natural cane sugar 100%, why a person with diabetes can use xylitol and cannot use sugar?

100% natural xylitol is a kind of nutritional value of sweet substances, and normal metabolism of human body sugar intermediates.Won't rise in blood sugar levels after eating the xylitol.So a person with diabetes can be used.But sugar is different, will rise in blood sugar levels after eating the sugar.