Diabetes timeline: What happens inside the body in the first 10 years after diagnosis

Key internal changes happening in the body

Kanikka Malhotra, Consultant Dietician & Diabetes Educator, tells indianexpress.com, “Most people assume diabetes is simply about managing sugar levels, but what is actually happening inside the body tells a far more complex story. In the first 5 to 10 years after diagnosis, chronically high blood glucose quietly begins damaging the body’s infrastructure from the inside out.”

She adds that one of the earliest changes happens in the blood vessels. Sugar molecules attach themselves to proteins and fats in a process called glycation, gradually making blood vessels stiffer and narrower. This affects both the large vessels supplying the heart and brain and the tiny capillaries serving the eyes, kidneys and nerves. “The nervous system begins taking hits too, particularly in the feet and hands, often without any obvious symptoms for years. The kidneys start showing early signs of stress. The eyes develop fragile, leaky blood vessels. And running beneath all of this is a steady current of systemic inflammation that silently accelerates the damage, while the pancreas continues losing its ability to produce insulin on its own.”

Which organs are most vulnerable to early damage?

What makes diabetes particularly unforgiving is how quietly it works. By the time most people feel something is wrong, significant internal damage may already have taken place over several years. Malhotra stresses, “The kidneys are often among the first to suffer. High blood sugar puts relentless pressure on their delicate filtering units, and without intervention, this progresses from early warning signs in urine tests to serious kidney disease over time.”

She adds that the eyes follow a similar silent path. Retinal blood vessels weaken, bleed or grow abnormally, and vision loss can set in well within the first decade if blood sugar remains uncontrolled. The heart and arteries age faster under diabetic conditions, sharply raising the risk of heart attacks and strokes. “The nerves in the feet deteriorate gradually, sometimes to the point where injuries go completely unnoticed, raising the risk of serious infections and amputations. The liver, too, tends to accumulate fat, which worsens insulin resistance and creates a damaging cycle. The sobering reality is that most of this damage builds up in complete silence.”

Lifestyle changes to slow down or prevent long-term complications

The first ten years after a diabetes diagnosis are not just a period of damage; they are genuinely the most powerful window of opportunity to change the trajectory of the disease. Malhotra notes, “Scientists call this the legacy effect, meaning the habits and choices made early on leave a lasting biological imprint on how the disease unfolds for decades to come. Food and nutrition are the most powerful tools available. A plan built around whole grains, vegetables, lean proteins and healthy fats helps stabilise blood sugar, calm inflammation and protect blood vessels.”

Even a modest weight loss of 5 to 10 percent of body weight can meaningfully improve how the body responds to insulin and reduce pressure on the kidneys, heart and liver. “Regular movement, both walking and strength-based exercise, helps muscles absorb glucose more effectively and brings down HbA1c levels. Managing blood sugar, blood pressure, and cholesterol together is critical, as all three compound the damage when left unchecked. From my perspective, the simplest daily habits, including consistent meal timings, cutting back on ultra-processed foods and staying well hydrated, are far from small. Done consistently, they are genuinely life-changing,” concludes Malhotra.