Breathing helps blood sugars by reducing stress levels and improving the balance of the autonomic nervous system (ANS). When we’re stressed, we activate the sympathetic branch of the ANS and release stress hormones such as cortisol. This can increase blood sugar and reduce insulin sensitivity. Slow, mindful breathing, on the other hand, activates the relaxation response, which lowers stress hormones and lessens sympathetic activation. Together, this can help with blood sugar management.