PrediabetesEvidence-basedLesson 3 of 20

Prediabetes: an early warning and opportunity

Prediabetes often has no symptoms. Food, activity, sleep and weight changes can lower risk, while regular clinical follow-up shows what is changing.

5 min+25 XP

Based on 2 referenced sourcesADACDC

What the numbers mean

Fasting glucose of 100–125 mg/dL, or an HbA1c of 5.7–6.4%, is called prediabetes. Above that range is type 2 diabetes. HbA1c reflects your average blood sugar over roughly three months, which is why it doesn't move overnight.

What's happening inside

Cells in muscle, liver and fat stop responding well to insulin. The pancreas compensates by making more of it. For years glucose can look almost normal while insulin quietly climbs — this is why insulin resistance usually starts long before a diagnosis.

Why this stage matters most

In the Diabetes Prevention Program, an intensive lifestyle program targeting 5–7% weight loss and about 150 minutes of weekly activity reduced progression to type 2 diabetes by 58% on average. Individual results vary, and follow-up testing still matters.

Key takeaways

HbA1c 5.7–6.4% signals prediabetes.
Insulin resistance precedes high glucose by years.
A structured lifestyle program reduced progression risk by 58% on average in a major trial.

Check your understanding

2 questions · answer to earn XP

1. What HbA1c range indicates prediabetes?

2. In the Diabetes Prevention Program, lifestyle change reduced progression by roughly how much?

Evidence & sources

This lesson reflects guidance from recognised health bodies and peer-reviewed research.

How we grade evidence

Guideline — recommendations from national or global health bodies.
Systematic review — pooled findings across many studies.
Cohort study — long-term observation of large groups of people.
Government data — official statistics and public health programmes.

For education purposes only — not intended to diagnose, treat or replace medical advice.