Normal Blood Sugar Levels: Fasting, After Meals and HbA1c Chart (India Guide)

India has more than 10 crore people living with diabetes and over 13 crore with prediabetes, according to the ICMR-INDIAB study published in 2023. Many of them do not know it, because high blood sugar usually causes no symptoms for years. Knowing your numbers is the first step.

Blood sugar chart at a glance

A diagnosis of diabetes is normally confirmed with a second test on a different day, unless you have clear symptoms with a very high reading.

Does normal sugar level change with age?

For adults without diabetes, the normal ranges above are the same at 25, 45 or 70. What changes with age is the target for people who already have diabetes: a doctor may accept slightly higher targets for an older person who is at risk of falls from low sugar. Children and pregnant women have their own targets, so always check with your doctor.

What is a normal sugar level after eating?

In a healthy person, blood sugar rises after a meal and usually comes back below 140 mg/dL within two hours. For people with diabetes, many doctors aim for below 180 mg/dL two hours after meals.

Targets if you already have diabetes

Common targets (your doctor may set different ones):

• Fasting and before meals: 80–130 mg/dL
• Two hours after meals: below 180 mg/dL
• HbA1c: below 7% for most adults

Prediabetes: the warning zone

Prediabetes means your sugar is higher than normal but not yet in the diabetes range. It is not harmless: it raises your risk of type 2 diabetes and heart disease. The good news is that losing 5–7% of body weight and walking briskly for 150 minutes a week can greatly reduce the chance of progressing to diabetes.

Signs your sugar may be high

• Frequent urination, especially at night
• Feeling very thirsty
• Tiredness and blurred vision
• Slow-healing cuts or frequent infections
• Tingling or numbness in the feet

Who should get tested, and how often?

Get a fasting sugar or HbA1c test if you are over 30, or earlier if you are overweight, have a family history of diabetes, had diabetes in pregnancy, or have high blood pressure. If your results are normal, repeat every 1–3 years; if you have prediabetes, test every year.

How diabetes is treated

Treatment starts with diet, activity and weight control. The most common first medicine is metformin (brands include Glycomet and Glyciphage). Others include glimepiride, DPP-4 inhibitors such as sitagliptin, SGLT2 inhibitors such as dapagliflozin, and insulin. Never start, stop or change diabetes medicines without your doctor.

When to see a doctor

See a general physician or endocrinologist if your fasting sugar is 100 or more, your HbA1c is 5.7% or more, or you have symptoms. Seek urgent care for very high sugar with vomiting, drowsiness or confusion.

Fasting vs post-meal vs HbA1c: which test is best?

Each test answers a different question:

• Fasting blood sugar shows how well your body controls sugar overnight. It is cheap and widely available, but one reading can be affected by a late dinner, poor sleep or illness.
• Post-meal (PP) sugar is taken two hours after a normal meal. It often rises earlier than fasting sugar in Indians, whose diets are high in refined carbohydrates.
• HbA1c reflects your average sugar over about three months and does not need fasting. It can be misleading in anaemia, thalassaemia trait, recent blood loss and pregnancy, which are common in India, so doctors sometimes combine it with sugar tests.

Home glucometer readings: what to know

Home meters are useful for people on diabetes treatment, but they can differ from laboratory values by about 10–15%. Wash and dry your hands before pricking, use the side of the fingertip, do not squeeze hard, and keep strips within their expiry date. Record your readings with the time and meal so your doctor can see patterns.

Low blood sugar (hypoglycaemia)

People taking insulin or sulfonylureas such as glimepiride can have low sugar, usually below 70 mg/dL. Signs include shaking, sweating, hunger, a fast heartbeat, confusion and irritability. Take 15 g of fast sugar (3 teaspoons of sugar or glucose in water, or half a glass of fruit juice), recheck after 15 minutes and repeat if still low, then eat a snack. Tell your doctor about any low readings.

Indian diet tips for healthier sugar levels

• Fill half your plate with vegetables, a quarter with protein (dal, paneer, eggs, fish, chicken) and a quarter with whole grains.
• Replace maida and white rice with millets (jowar, bajra, ragi), brown rice or whole wheat in moderate portions.
• Choose whole fruits instead of juices, and avoid sweetened drinks.
• Eat at regular times and avoid long gaps followed by heavy meals.
• Watch hidden sugar in chai, biscuits and packaged snacks.

Myths and facts

• Myth: "Only people who eat sweets get diabetes." Fact: Genes, weight, inactivity and refined carbohydrates matter more.
• Myth: "Insulin means the end stage." Fact: Insulin is simply a very effective treatment and is often used early or temporarily.
• Myth: "Once sugar is normal, I can stop medicines." Fact: Normal readings usually mean the treatment is working. Change medicines only with your doctor.