How to Prevent Diabetes

Preventing type 2 diabetes is possible — and for Indians, where the disease strikes earlier and harder, it's one of the highest-return things you can do. Most of what works is lifestyle; medicines play a role in higher-risk groups.

Know your risk

• Family history (parent/sibling with diabetes).
• BMI ≥ 23 (Asian cut-off) or waist > 90 cm men / > 80 cm women.
• Age ≥ 30 — screen even if you feel fine.
• PCOS, past gestational diabetes, high BP, fatty liver.
• Sedentary lifestyle, poor sleep, chronic stress.

What to do (in order of impact)

• Lose 7% of body weight if overweight — for an 80 kg person that's ~5–6 kg. Single biggest prevention step.
• 150 min/week of brisk walking or equivalent + strength training 2×/week.
• Shift to whole grains / millets, pulses, vegetables, adequate protein — see Diabetic Diet and Diets.
• Cut sugar-sweetened drinks, sweets, refined flour, deep-fried snacks — the biggest single diet change.
• Sleep 7–8 hours; manage stress.
• Stop tobacco; limit alcohol.

Screening schedule

• All Indian adults from age 30 — fasting glucose or HbA1c.
• Earlier and more often if BMI ≥ 23 + any other risk factor above.
• Women after gestational diabetes — yearly for life.
• Repeat every 2–3 years if normal; yearly if prediabetic.

When medicines help prevention

• A biguanide-class tablet has evidence for prevention — especially in higher-risk prediabetes (BMI ≥ 27, HbA1c close to 6.4%, past GDM).
• GLP-1 class may be considered in high-risk obesity, under a doctor.
• Don't self-start these; they are adjuncts to lifestyle, not replacements.

Myths to drop

• "I don't eat sweets, so I won't get diabetes." — rice/roti/sugar drinks all raise sugar; total carbs and weight matter.
• "I'm slim, I'm safe." — not in South Asia; diabetes often develops at normal BMI with large waist.
• "Karela juice prevents diabetes." — modest effect, no substitute for the above.