Kale is often described as a "superfood" for good reasons. It's packed with compounds that may help decrease blood sugar levels, including fiber and flavonoid antioxidants.

A study that included 42 Japanese adults demonstrated that consuming either 7 or 14 grams of kale-containing foods with a high carb meal significantly decreased post-meal blood sugar levels, compared with a placebo.

Research has shown that the flavonoid antioxidants found in kale, including quercetin and kaempferol, have potent blood-sugar-lowering and insulin-sensitizing effects.