Sugar substitutes are essentially identical to normal sugar when it comes to blood sugar impact. 

Agave Nectar (also known as agave syrup) isn't a healthy food. It’s basically high-fructose corn syrup masquerading as healthy food.

It's extracted from various species of the agave plant, which grow mainly in Mexico and South Africa.

It may have a lower glycemic index, but it’s still up to 90 percent liquid fructose.

Honey is sugar in liquid form: 82% of honey is sugar and the rest is water with small amounts of pollen.

A study in the Journal of Nutrition found that when subjects were given honey, cane sugar, or high-fructose corn syrup, they saw no notable difference in blood sugar increase.

In the end, sugar is sugar. Honey or agave nectar may be slightly better for you than pure white sugar from an overall nutrition perspective. But they aren't alternatives for blood sugar reduction.

Sweeteners, which are often used in diet foods are sugar alcohols.

Sugar alcohols are slightly lower in calories than sugar and do not promote tooth decay or cause a sudden increase in blood glucose.

The most common sugar alcohols are Maltitol, Sorbitol, Xylitol, Erythritol, and Isomalt.

They do indeed affect your blood sugar less than regular sugar, but their main problem is that they also work as laxatives. This means that they most likely will give you gas or cause bloating.

Sugar alcohols give you about 2.5 calories/gram versus 4 calories/gram for regular sugar. If you can stomach them, you can reduce the blood sugar impact by 50%. This is not really worth the potential health issues and side effects.

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