Structured yoga and breathing practice, added on top of standard medication, has been shown in Indian trials to improve blood sugar control, heart rate variability (HRV), and cardiometabolic risk in people with type 2 diabetes. India has one of the world's largest diabetic populations, which is partly why Indian researchers have studied this so thoroughly. In one randomized controlled trial, men with newly treated type 2 diabetes who added a structured yoga module (postures plus pranayama) to their oral medication for 12 weeks improved their HRV, sympathovagal balance, and metabolic markers, and lowered cardiovascular risk — more than medication alone. This positions yoga and breathing not as a cure, but as a genuine complement to diabetes care, working partly through the autonomic nervous system that diabetes tends to disrupt.
Why the autonomic nervous system matters in diabetes
Type 2 diabetes doesn't only raise blood sugar — over time it can damage the autonomic nervous system, lowering HRV and tilting the balance toward sympathetic ("fight or flight") dominance. This autonomic dysfunction is part of why diabetes raises cardiovascular risk. That's the opening for breathing and yoga: practices that raise HRV and restore parasympathetic ("rest and digest") activity address one of the mechanisms behind diabetic complications, alongside the blood-sugar problem itself.
What the trials found
HRV and cardiometabolic risk. In a 12-week randomized trial, men with type 2 diabetes received standard oral antidiabetic drugs alone, or the same drugs plus a structured yoga module (asana and pranayama). The yoga group improved total HRV power and sympathovagal balance, improved metabolic function, and reduced cardiovascular risk markers — significantly more than medication alone.
Blood glucose and insulin. In another trial, adding yoga and pranayama to conventional medicine improved fasting and post-meal blood glucose, serum insulin, and lipid profile compared with medicine alone.
Prevention in high-risk people. A randomized trial within India's large Niyantrita Madhumeha Bharat program found a diabetes-specific yoga protocol improved glycemic and lipid profiles, waist circumference and blood pressure in people at high risk of developing diabetes.
Comprehensive breathing programs. An observational study of a short residential yogic breathing program that included Sudarshan Kriya reported a larger drop in blood sugar in people with diabetes than in those without.
Most of these studies are modest in size and several are single-center, so the fair reading is consistent, encouraging evidence for yoga as an add-on — not proof that it can manage diabetes on its own.
How it likely works
Several mechanisms overlap. Slow breathing and relaxation lower stress hormones like cortisol, which raise blood sugar — so calming the stress response can help glycemic control (see how breathing lowers stress hormones). Improved HRV and baroreflex function restore autonomic balance, easing the cardiovascular strain diabetes causes — the same loop behind slow breathing and blood pressure. Yoga postures add physical activity, which improves insulin sensitivity. It's a whole-system effect, which is why structured programs combining postures, breathing, and relaxation tend to outperform any single element.
How to use it safely
- •Add it to your treatment, don't replace anything. These benefits appeared on top of medication.
- •Favor structured, gentle practice — slow pranayama, relaxation, and appropriate postures. Avoid intense forceful breathing if you have cardiovascular complications.
- •Practice consistently — the trials used weeks to months of regular practice, not one-off sessions.
- •Monitor your blood sugar — as your practice and fitness improve, your glucose (and medication needs) may change. Work with your doctor; never adjust medication on your own, especially if you use insulin or drugs that can cause lows.
- •Learn from a qualified teacher if you can, especially for a structured module.
See your autonomic balance improve
One of the clearest benefits in the research — improved HRV and sympathovagal balance — is something ONDA measures. It reads your resting heart rate and HRV from your Apple Watch, so you can track whether your autonomic balance shifts as you build a regular breathing practice (see how to raise HRV naturally). ONDA does not measure blood sugar; HRV reflects the autonomic side of the picture only.
ONDA is a breathing and HRV biofeedback app, not a medical device. This article draws on Indian randomized trials of yoga and pranayama in type 2 diabetes. It is not a substitute for diabetes care; consult your doctor.