Kale contains an antioxidant

Kale contains an antioxidant known as alpha lipoic acid, which has been shown to lower glucose levels, increase insulin sensitivity and prevent oxidative stress induced changes in patients with diabetes. Studies on alpha lipoic acid have also shown decreases in peripheral neuropathy and/or autonomic neuropathy in diabetics. Of note, most studies have used intravenous alpha lipoic acid and it is unsure whether oral supplementation would elicit the same benefits.