Type 2 Diabetes: The Silent Warning Before Symptoms Appear

# Adrian Mercer

Many people still understand diabetes simply as a condition in which “blood sugar rises.” But type 2 diabetes is far more complex. It develops when the body cannot use insulin effectively or cannot produce enough insulin, causing glucose levels in the blood to rise gradually. The problem does not end there. Persistently high blood sugar can eventually damage the heart, blood vessels, kidneys, eyes and nervous system.

According to the World Health Organization, the global burden of diabetes is rising rapidly, with type 2 diabetes accounting for the great majority of cases. The International Diabetes Federation’s 2024 estimates for Nepal indicate an adult diabetes prevalence of about 7.7 percent, with approximately 1.26 million adults living with the condition. For a country like Nepal, this is not merely a treatment issue. It is also a major public-health challenge involving early detection and prevention.

One of the most difficult aspects of type 2 diabetes is its “silent” onset. Many people may have no obvious symptoms while the disease is developing. Excessive thirst, frequent urination, unusual fatigue, blurred vision or unexplained weight loss can occur, but blood glucose may already have reached abnormal levels before any of these signs become noticeable. Feeling healthy, therefore, is not proof that diabetes is absent.

The stage before diabetes is commonly known as prediabetes. In this condition, blood glucose levels are higher than normal but have not yet reached the threshold used to diagnose diabetes. Prediabetes is an important warning sign, not an inevitable final outcome. With appropriate lifestyle changes and medical monitoring, progression to type 2 diabetes can often be delayed and, in some cases, prevented. Detecting the condition at this stage provides one of the best opportunities for intervention.

People who have excess abdominal fat, are overweight, have a family history of diabetes, live with high blood pressure, have low levels of physical activity or previously experienced diabetes during pregnancy should consider blood glucose testing as part of routine health assessment. Risk also increases with age, but type 2 diabetes is no longer confined to older adults. Sedentary lifestyles, calorie-dense diets and increasing obesity are contributing to rising risk among younger people as well.

Tests commonly used to assess blood glucose include fasting blood glucose, HbA1c and, when appropriate, an oral glucose tolerance test. The choice of test and interpretation of results should be made in consultation with a healthcare professional. Home glucose meters can be useful for regular monitoring, but a single random reading should not be used to conclude independently that a person does or does not have diabetes.

Prevention is not necessarily complicated. Maintaining a healthy body weight, engaging in at least 150 minutes of moderate-intensity physical activity each week, limiting foods high in added sugar and saturated fat, eating sufficient vegetables and other nutritious foods, and avoiding tobacco can all help reduce the risk of type 2 diabetes. Even regular walking can provide meaningful long-term benefits when it becomes a consistent part of daily life.

However, diabetes prevention should not be reduced to the advice to simply “stop eating sugar.” The condition is influenced by overall lifestyle, body weight, physical activity, genetic susceptibility and the body’s metabolic processes. Avoiding sweets alone does not eliminate risk, and people already living with diabetes should not adopt excessively restrictive diets without appropriate medical guidance.

Early detection of diabetes does more than provide an opportunity to control blood glucose. It also creates time to reduce the risk of future damage to the kidneys, eyes, heart and nerves. Once diabetes is diagnosed, regular blood-pressure monitoring, kidney assessment, eye examinations and, when appropriate, evaluation of foot health become important parts of long-term care.

The most important message is straightforward: type 2 diabetes can remain without obvious symptoms for a long time, but an unseen risk does not remain harmless simply because it is unnoticed. Timely testing for people at risk and the adoption of healthy habits before disease develops are among the most effective forms of protection available.