Type 2 diabetes can rewire your heart and drains its energy slowly, warns study

Diabetes and heart disease patients have very pronounced metabolic disruptions, exhausting the heart from within (Image: Pexels)

• Type 2 diabetes rewires heart energy systems and weakens muscle, study finds
• Diabetes causes stiff, fibrous tissue buildup, raising heart failure risk
• Researchers identified unique molecular changes in diabetic hearts

Did our AI summary help?

Type 2 diabetes can raise the risk of heart disease. However, the exact mechanisms remained unclear until recently. Now, a team of researchers from the University of Sydney has uncovered evidence that diabetes does physically transform the heart.

Their study, recently published in EMBO Molecular Medicine, shows that diabetes rewires the heart’s energy systems, weakens its muscle, and causes stiff, fibrous tissue to accumulate, bringing patients closer to heart failure. Dr Benjamin Hunter, one of the lead researchers, explains, “We’ve always seen a link between heart disease and type 2 diabetes. But this is the first study to reveal a unique molecular fingerprint in patients with both diabetes and ischemic heart disease.”

Using donated human hearts from transplant patients, the team could directly observe how diabetes alters the heart at a cellular and structural level, a level of detail rarely achievable in human studies.

Diabetes drains the heart’s energy

A healthy heart generates energy mostly from fats, with glucose and ketones also playing a part. Diabetes, however, disrupts this delicate balance. The disease reduces heart cells’ sensitivity to insulin, limiting glucose uptake and placing extra stress on mitochondria, the tiny energy powerhouses inside cells. In patients with both diabetes and heart disease, these metabolic disruptions were far more pronounced, essentially exhausting the heart from within.

Also read | Heart attack, heart failure risk: 4 symptoms athletes, bodybuilders should never ignore

Dr Hunter notes, “The metabolic effect of diabetes in the human heart has long been overlooked. Our research shows it’s an active driver of heart failure, not just a co-existing condition.”

Stiff muscles and fibrous buildup

Diabetes also interferes with proteins that control heart muscle contraction and calcium regulation, which are essential for pumping blood effectively. Combined with an accumulation of fibrous tissue, these changes stiffen the heart and reduce its efficiency. Advanced microscopy confirmed that these structural changes were real and significant, particularly in patients with ischemic heart disease, the most common cause of heart failure.

Also read | What your cardiologist wants you to know about surviving, and living with, heart failure

5 ways diabetes changes the heart

Disrupts energy production: Reduces insulin sensitivity and strains mitochondria.

Weakens muscle contraction: Lowers protein levels controlling calcium and contraction.

Triggers fibrosis: Builds up stiff, fibrous tissue in the heart muscle.

Alters gene expression: Changes in energy and structure proteins visible at the genetic level.

Accelerates heart failure risk: Makes the heart less able to cope with stress over time.

Associate Professor Sean Lal, co-lead of the study, says these insights could transform how heart disease is treated in people with diabetes. “By identifying the pathways responsible for mitochondrial dysfunction and fibrosis, we can explore new therapies, refine diagnosis, and improve management strategies,” he explains.

FAQs on Diabetes and Heart Connection

1. How does type 2 diabetes affect heart disease risk?

Type 2 diabetes increases the risk of heart disease by disrupting the heart's energy balance, weakening muscles, and causing fibrous tissue buildup, potentially leading to heart failure.

2. What changes occur in the heart due to diabetes?

Diabetes rewires the heart’s energy systems, lowers muscle contraction efficiency, and increases fibrous tissue, making the heart stiffer and less efficient at pumping blood.

3. How does diabetes impact the heart at a cellular level?

Diabetes reduces heart cells' sensitivity to insulin, strains mitochondria, and alters protein levels responsible for muscle contraction and calcium regulation, leading to significant cellular changes.

4. What is the connection between diabetes and heart failure?

Diabetes actively drives heart failure by disrupting energy production, weakening muscle contraction, triggering fibrosis, altering gene expression, and making the heart less capable of handling stress.

5. Can understanding these changes lead to better treatments for heart disease in diabetic patients?

Yes, identifying pathways responsible for mitochondrial dysfunction and fibrosis can help develop new therapies, refine diagnosis, and improve management strategies for heart disease in people with diabetes.

Disclaimer: This article, including health and fitness advice, only provides generic information. Don’t treat it as a substitute for qualified medical opinion. Always consult a specialist for specific health diagnosis.