Apples are significantly better for blood sugar stability than bananas. With a GI of 36 versus a ripe banana at 62, apples cause a much gentler blood sugar response. The high fiber content in apples, particularly pectin, is responsible for this advantage.
Apples contain pectin, a soluble fiber that slows glucose absorption in the intestines. Bananas, especially ripe ones, have higher sugar content and faster absorption, making apples the clear winner for blood sugar control.