Prediabetes
Elevated glucose below the diabetes threshold
What it is
Prediabetes is blood glucose that is higher than normal but below the diabetes threshold — an HbA1c of 5.7–6.4%, a fasting glucose of 100–125 mg/dL, or an impaired glucose tolerance test. It reflects developing insulin resistance and is a warning window, not a fixed destiny.
Why it matters
Prediabetes identifies people at high risk of progressing to type 2 diabetes and its complications — but it is one of the most modifiable states in medicine. Intensive lifestyle change can cut progression substantially, often more than medication.
What BioSignal knows about treating this
What works for Prediabetes
BioSignal’s clinical summary, most important first.
- Intensive lifestyle change (the strongest evidence — diet, activity, and ~5–7% weight loss)
- Physical activity for insulin sensitivity
- Dietary carbohydrate quality
- Metformin in selected higher-risk people (clinician-directed)
- Sleep and weight management
Signal Records relevant to this condition
Interventions and contributing factors — some of these records describe a cause rather than a cure. The rating shown is BioSignal’s confidence in that Signal Record, not a claim about how well it treats this condition. Open any of them for the full evidence.
- Intermittent FastingModerate confidence
It works for weight loss — by helping you eat less, not by metabolic magic. Not superior to calorie restriction. Protect your muscle. Unsafe on insulin.
- MagnesiumModerate confidence
Genuinely effective for a few specific things — eclampsia (in hospital), constipation, migraine prevention, and a modest blood-pressure effect. The reasons most people actually buy it — sleep, cramps, anxiety — are the weakest part of the evidence.
- MetforminHigh confidence
Safe, cheap, effective first-line glucose lowering and diabetes prevention; modest cardiovascular story; longevity claims unproven.
New to this? Read these first
How this usually unfolds
- Recognize risk factors
- Get diagnosed
- Track key biomarkers
- Lifestyle first
- Evidence-based treatment
- Long-term monitoring
Who is at risk
- Overweight and central obesity
- Physical inactivity
- Family history of type 2 diabetes
- Older age
- History of gestational diabetes or PCOS
- Higher-risk ethnic background
How it's diagnosed
Diagnosed by HbA1c 5.7–6.4%, fasting glucose 100–125 mg/dL, or a 2-hour glucose tolerance test of 140–199 mg/dL. Fasting insulin and HOMA-IR can add context on the underlying insulin resistance.
Key biomarkers
Lifestyle
Explore this condition across BioSignal
Related Foundations
Related Signal Records
Related peptide families
Related body systems
Related conditions
Frequently asked questions
Does prediabetes always become diabetes?
No. It signals high risk, but progression is far from inevitable — intensive lifestyle change (diet, activity, modest weight loss) substantially reduces the chance of developing diabetes, and many people return to normal glucose.
Should I take metformin for prediabetes?
Lifestyle change is first-line and, in trials, more effective. Metformin is considered for selected higher-risk people (for example, younger individuals with obesity or a history of gestational diabetes) — a clinician decision.
Evidence summary
The Diabetes Prevention Program and similar trials firmly establish that lifestyle change reduces progression from prediabetes to diabetes, outperforming metformin; the risk-marker value of prediabetes is well documented.
References & sources
- ADA Standards of Care in Diabetes
- Diabetes Prevention Program (DPP)
Educational information — not medical advice
Is this condition page clear, accurate, and useful? Your feedback shapes what we review next.
Give feedback