Type 2 diabetes

Type 2 diabetes means that blood glucose stays above the normal range because insulin is no longer working well enough, no longer being produced in sufficient quantity, or — most commonly — both.

It develops slowly. For years, muscle, liver and fat cells respond less readily to insulin, and the pancreas compensates by making more of it. Glucose stays acceptable during that period, which is why people can be some way along the path with entirely normal reports. The diagnosis is made at the point where compensation falls behind: an HbA1c of 6.5% or above, a fasting glucose of 126 mg/dL or above, or a two-hour value of 200 mg/dL or above, each confirmed rather than acted on from a single reading.

India carries an enormous share of this condition — national survey work puts the figure at more than a hundred million adults, with a similar number in the prediabetic range. What matters clinically is the character of the Indian picture as much as its scale. Diabetes tends to appear roughly a decade earlier here than in European populations, at a lower body weight, with a stronger family tendency and a marked leaning toward high glucose after meals rather than while fasting. The South Asian pancreas appears to have less reserve to draw on, and the body stores fat around the organs and inside the liver rather than under the skin.

That earlier onset is the reason the condition deserves respect rather than alarm. Someone diagnosed at 38 has four decades of blood-vessel exposure ahead, which is a different proposition from a diagnosis at 68. It is also, encouragingly, four decades in which good control does its work — the long trials show that what happens in the first years of treatment continues to pay off long afterward.

The complications everyone worries about come from sustained exposure of small and large blood vessels to high glucose, usually alongside blood pressure and lipid abnormalities. The eye, the kidney, the nerves and the arteries are the usual sites. None of this is automatic. The great majority of it is preventable with glucose, blood pressure and lipids kept in a reasonable range and with the screening tests done on schedule.

It is worth naming what type 2 diabetes is not. It is not type 1, an autoimmune loss of insulin-producing cells that needs insulin from the outset. Occasionally an adult has a slower autoimmune form, or a genetic form running strongly through a family from a young age. When the picture does not fit — a lean person, rapid weight loss, a poor response to tablets — that is worth revisiting rather than pushing through.

ⓘThis information is educational and not a diagnosis.

A large proportion of type 2 diabetes in India is found on a routine health check, an insurance screening or a pre-operative test, in someone who felt entirely well. There is often nothing to feel until glucose is quite high.

When symptoms do appear, the classical ones are passing urine more often — particularly getting up at night — thirst that returns soon after drinking, and a tiredness that sleep does not repair. Weight loss without trying, hunger returning within an hour or two of a full meal, and blurred vision that comes on over weeks belong to the same group.

The quieter signs are the ones more often missed: recurrent skin or urinary infections, itching in the genital area, gum problems, cuts on the feet that take longer to settle, and tingling, burning or numbness in the toes at night. Erectile difficulty in men frequently precedes the diagnosis and is rarely mentioned.

Risk profile does more work than symptoms here. A parent or sibling with type 2 diabetes, a previous pregnancy affected by gestational diabetes, PCOS, fatty liver, raised triglycerides, high blood pressure, or a waist above 90 cm in men and 80 cm in women — any of these is reason to check the number rather than wait to feel something.

If you already have the diagnosis, the things worth recognising shift. Repeated low-glucose episodes, particularly at night or during a fast, mean the treatment needs review. New numbness or a foot that has lost sensation changes how carefully feet need checking, because an injury on a numb foot is not felt.

The signs listed below are different in kind. They are not part of living with diabetes; they are reasons to be seen today.

Diagnosis is the smallest part of testing in type 2 diabetes. The larger part is the annual review that decides whether the next twenty years go well.

Establishing the diagnosis. HbA1c is the usual starting point because it needs no fasting. It has real limitations in India: anaemia, thalassaemia trait, recent blood loss, pregnancy and chronic kidney disease all distort it, and anaemia is common enough here to matter. Where the result and the clinical picture disagree, fasting glucose or a glucose tolerance test is added. A diagnosis is confirmed on two abnormal results, or one abnormal result with clear symptoms.

Tracking control. HbA1c every three to six months is standard. It is an average, which is its strength and its weakness — it can look acceptable while hiding both high post-meal peaks and low readings. Home monitoring is most informative when paired to a question: a reading before and two hours after your usual dinner tells you more than a random fasting value each morning.

Screening for complications. This is where Indian practice most often falls short, and where the return is clearest. A urine albumin-to-creatinine ratio with creatinine and eGFR, once a year, detects kidney involvement while it still responds to treatment. A dilated retinal examination, once a year, finds changes long before vision alters. A foot examination for sensation, pulses and skin, once a year. Lipids and blood pressure at every review, because cardiovascular disease rather than glucose determines most of the long-term outcome.

Looking at the company it keeps. Liver enzymes with an ultrasound, thyroid function, and vitamin B12 after several years of metformin. The B12 point is practical: the deficiency produces tingling in the feet that is easily attributed to diabetic nerve damage and treated as permanent when it is not.

Costs and access. A full annual review costs more than an HbA1c alone, which is why it is skipped. Many Indian hospitals bundle these tests into a diabetes review package for less than the sum of the parts, and retinal photography is now available at many optometry chains. It is worth asking for.

What follows describes how type 2 diabetes is managed in general. Decisions about which medicine, which dose and which target belong to you and your own doctor, who knows your kidneys, your heart and your history. Nothing here is a reason to start, stop or change anything you have been prescribed.

The plate. The most useful change in most Indian homes is composition rather than elimination: a measured portion of rice or roti instead of an open-ended one, a substantially larger share of the meal given to dal, vegetables and protein, and attention to what arrives between meals. Sugary drinks, packaged juices, biscuits with chai and evening fried snacks contribute more than most people estimate. Jaggery and honey behave like sugar. Eating vegetables and protein before the staple blunts the post-meal rise for many people, which suits an Indian thali well.

Muscle and movement. Skeletal muscle takes up most of the glucose in the body, so resistance training two or three times a week has a direct effect on control, independent of weight. Around 150 minutes a week of moderate aerobic activity adds cardiovascular benefit. A short walk after dinner is one of the highest-yield habits available, and it fits Indian meal timing, where the largest meal is often the last.

Weight, where it applies. Sustained loss of 5–10% improves glucose, blood pressure and liver fat. Larger sustained loss achieved early after diagnosis is what underlies the remission seen in trials.

Medicines. Metformin remains the usual first step and has decades of safety behind it. Beyond that, the choice is increasingly guided by what else is present rather than by glucose alone — certain classes have shown benefit for the heart and the kidney, others are chosen for their effect on weight, and some older agents carry a meaningful risk of low glucose. Insulin is used when it is needed, sometimes briefly, sometimes long term. One specifically Indian caution: with so many brand names and fixed-dose combinations in circulation, taking the same molecule twice under two names is a common and avoidable error. Bringing every strip to every appointment prevents it.

The rest of the risk. Blood pressure, lipids, stopping tobacco in any form including gutka and khaini, and treating sleep apnoea all sit alongside glucose rather than behind it. Vaccination and dental care matter more than people expect.

Follow-up. HbA1c every three to six months, an annual review covering eyes, kidneys, feet, lipids and blood pressure, and a plan revisited as life changes. Small steps held for years outperform severe efforts held for months.

Living well with type 2 diabetes is largely a matter of understanding your own numbers well enough to have a real conversation about them — what HbA1c is averaging, what your kidney and lipid results are saying, and which of them is the one to move next.

The Learning Session below works through reading your own blood reports in a small group, with time for the questions that rarely fit into a consultation.

If you would like your reports, medicines and daily food reviewed together and turned into a plan you can hold, that is a conversation for a consultation.