Yacon is very low on the glycemic index scale. The glycemic index is a measurement of how quickly blood sugar levels (glucose in the blood) rise after eating a particular food. Both options will bring similar benefits, as they both contain FOS, which is the most essential element. Yacon powder acts as a prebiotic, which helps control organisms that live in our intestinal systems, such as Bifidus and Lactobacillus. The bacteria help process FOS into short-chain fatty acids.