Type 2 Diabetes: Early Signs, Diagnosis and First-Line Treatment
India has one of the largest populations living with diabetes in the world, and a still larger group with prediabetes who do not know it. Type 2 diabetes is not a condition that appears overnight. Insulin resistance builds quietly for years while blood glucose stays in a range that causes no symptoms at all.
What is actually going wrong
Insulin moves glucose from the bloodstream into muscle and fat cells. In type 2 diabetes, those cells respond poorly to insulin, so the pancreas compensates by producing more. For a while this works and glucose stays normal. Over time the pancreas cannot keep up, and glucose starts to rise – first after meals, then in the fasting state.
This is why the condition is progressive, and why treatment often needs adjusting over the years even when someone is doing everything right.
Early signs worth noticing
Classic symptoms appear late, usually when glucose is already well above target.
- Passing urine more often, especially waking at night to do so
- Persistent thirst
- Unexplained weight loss despite a normal or increased appetite
- Fatigue that does not improve with rest
- Blurred vision that fluctuates
- Cuts, boils or skin infections that heal slowly
- Repeated fungal infections, including genital itching
- Tingling or numbness in the feet
Many people are diagnosed with none of these, on a routine test. Some are diagnosed only when a complication – a foot ulcer, a retinal change, a heart attack – brings them to hospital.
The three diagnostic tests
- Fasting plasma glucose: 126 mg/dL or above on two occasions
- HbA1c: 6.5% or above; this reflects average glucose over roughly three months
- Oral glucose tolerance test: 200 mg/dL or above two hours after a 75 g glucose load
Prediabetes sits just below these thresholds – fasting glucose 100-125 mg/dL or HbA1c 5.7-6.4% – and identifies people at high risk who can often prevent progression.
HbA1c is convenient because it needs no fasting, but it can be misleading in anaemia, recent blood loss, pregnancy and some haemoglobin variants, all of which are common in India. A doctor may prefer glucose-based testing in those situations.
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Who should be screened
- Everyone from about age 30 in Indian populations, given the earlier onset compared with European populations
- Anyone with a BMI above 23 plus one other risk factor
- Anyone with a first-degree relative with diabetes
- Women with a history of gestational diabetes or PCOS
- People with high blood pressure, abnormal lipids or fatty liver
What treatment looks like in the first months
Food
There is no single diabetic diet. What consistently helps is reducing refined carbohydrate load – white rice, maida, sugary drinks, sweets – and building meals around vegetables, dal and pulses, whole grains, and adequate protein. Portion size of the staple carbohydrate matters more than eliminating it. Distributing carbohydrate across the day rather than in one large evening meal tends to flatten glucose peaks.
Movement
Both aerobic exercise and resistance training improve insulin sensitivity, and the effect is partly independent of weight loss. A 10-15 minute walk after meals has a measurable effect on post-meal glucose.
Weight
In people diagnosed within the last few years, substantial weight loss can push type 2 diabetes into remission – normal glucose without medication. Remission is not a cure and needs the weight change to be sustained, but it is a real and documented outcome.
Medication
Metformin remains the usual first drug: long track record, low cost, weight-neutral, and no risk of hypoglycaemia on its own. Newer classes – SGLT2 inhibitors and GLP-1 receptor agonists – are now added early in people with heart disease, heart failure or kidney disease because they reduce those specific risks beyond glucose control. Sulfonylureas are cheaper and effective but carry a risk of low glucose and weight gain.
The checks that matter every year
Diabetes care is not only about glucose. The annual review should include:
- HbA1c, usually every three to six months
- Blood pressure at every visit
- Lipid profile
- Kidney function with urine albumin-to-creatinine ratio
- A dilated eye examination
- A foot examination for sensation and circulation
Most of the serious harm from diabetes comes from blood vessels, and blood pressure and lipid control contribute at least as much as glucose control to preventing heart attacks and strokes.
When to seek care urgently
- Vomiting, deep rapid breathing, abdominal pain or drowsiness with high glucose
- Glucose readings persistently above 300 mg/dL
- Symptoms of low glucose – sweating, tremor, confusion – in someone on insulin or sulfonylureas
- Any foot wound, blister or colour change, which should be seen the same week
This article is general health information and does not replace individual medical advice. Do not start, stop or change diabetes medication without consulting your doctor.