Prediabetes is usually delivered as good news. The sugar is only slightly high, come back next year. That framing wastes the most valuable opportunity in the whole course of the disease.
This is the stage at which structured intervention prevents or substantially delays diabetes in a large proportion of people, and the effect persists for years.
What Prediabetes Means
Prediabetes is defined by blood sugar above normal but below the diabetic threshold.
- HbA1c: 5.7 to 6.4 percent
- Fasting glucose: 100 to 125 mg/dL
- Two hour glucose after a glucose load: 140 to 199 mg/dL
Underlying it is insulin resistance. The pancreas produces insulin normally but tissues respond poorly, so the pancreas compensates by producing more. Prediabetes is the point at which that compensation is beginning to fail.
Importantly, damage to blood vessels and nerves begins during the prediabetic stage, not on the day the diabetic threshold is crossed.
Who Should Be Tested
Prediabetes causes no symptoms, so it is found only by testing.
- Anyone over thirty five, or over thirty with additional risk factors
- Waist above 90 cm in men or 80 cm in women, regardless of BMI
- A parent or sibling with type 2 diabetes
- Previous gestational diabetes, which carries a high subsequent risk
- PCOS
- High blood pressure or abnormal lipids
- Fatty liver on any scan
- Sedentary lifestyle
- Darkened velvety skin at the neck or armpits, a visible sign of insulin resistance
Waist circumference matters more than weight in Indians. A person with a normal BMI and a protruding abdomen carries meaningful risk.
The Evidence That Prevention Works
Large trials, including studies conducted in India, have shown that structured lifestyle intervention reduces progression to diabetes substantially, by roughly half over several years.
Notably, lifestyle intervention outperformed metformin in most of these studies, and the benefit persisted long after the intervention period ended.
The components were not dramatic: modest weight reduction of five to seven percent, and around 150 minutes of moderate activity weekly. That is achievable for most people, and it is more effective than any tablet at this stage.
The Dietary Changes That Matter
The aim is to reduce the glucose load and improve insulin sensitivity, not to eliminate whole food groups.
- Reduce the portion of white rice and add more vegetables and dal to the same plate
- Replace some rice with millets such as ragi, kambu and thinai, which have a lower glycaemic impact
- Include protein at every meal, which blunts the glucose rise
- Eliminate sugary drinks, packaged juices and sweets, which is the highest yield single change
- Eat fruit whole rather than as juice
- Increase fibre from vegetables, pulses and whole grains
- Do not skip meals and then eat a large one, which produces bigger spikes
Complete rice avoidance is neither necessary nor sustainable for most South Indian households. Portion size, pairing with protein and fibre, and a walk afterwards achieve more. Our dietetics team works within existing meal patterns.
Activity: What Kind and How Much
Both types of exercise matter and they work differently.
- Aerobic activity: 150 minutes weekly of brisk walking, cycling or swimming, broken into manageable sessions
- Resistance training: two or three sessions weekly. Muscle is the main site of glucose disposal, so building it directly improves insulin sensitivity
- Post meal walks: fifteen minutes after each main meal, which blunts the post meal glucose rise immediately
- Reducing sitting time: standing or moving every thirty to sixty minutes, which has effects independent of formal exercise
Resistance training is consistently neglected in favour of walking alone. Adding two short sessions weekly makes a measurable difference to insulin sensitivity.
Sleep and Stress Are Not Optional Extras
Both affect glucose metabolism directly, through measurable hormonal pathways.
Sleeping less than six hours nightly worsens insulin resistance and increases appetite through effects on leptin and ghrelin. Untreated obstructive sleep apnoea, common in people with abdominal weight, independently worsens glucose control and should be considered in anyone who snores with daytime tiredness.
Chronic stress raises cortisol, which raises blood glucose. This is physiology rather than a soft factor, and addressing it produces measurable change.
Seven to eight hours of sleep is as much a part of the intervention as the diet.
When Medication Is Considered
Lifestyle change is first line. Metformin is considered in specific higher risk situations.
- Age under sixty with a BMI above 35
- Previous gestational diabetes
- HbA1c above 6 percent despite genuine lifestyle effort
- Progressive rise in HbA1c on repeat testing
- PCOS with marked insulin resistance
Metformin reduces progression, though less effectively than sustained lifestyle change in most trials. It works alongside rather than instead of it.
What to Monitor
Prediabetes needs follow up rather than a single conversation.
- HbA1c annually, or six monthly if the value is at the higher end
- Weight and waist circumference every few months, which respond faster than HbA1c
- Blood pressure, since it commonly rises alongside
- Lipid profile annually
- Liver function and a scan if fatty liver is suspected
Track waist rather than only weight. Muscle gained through resistance training can keep weight stable while waist reduces, which represents genuine improvement that the scale hides.
Our diabetology department provides structured prediabetes follow up rather than annual reassurance.
Prediabetes is not a mild condition to be watched, it is a window that closes. Five to seven percent weight reduction, 150 minutes of activity weekly, two resistance sessions, no sugary drinks and a walk after meals genuinely prevents progression for many people.
Our diabetology department at T. Nagar assesses and follows up prediabetes.
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