Iron Deficiency & Anemia in Children

August 5, 2026

Prediabetes: Your Early Warning Sign

A Guide to Understanding Your Risk, Getting Diagnosed, and Taking Action

👨‍⚕️ Muthukumar Vellaichamy, MD
CEO & Founder, KSP Health

Source: Nature Reviews Disease Primers (2025)

💛 What is Prediabetes?

Think of prediabetes as a metabolic yellow light. It means your blood sugar levels are higher than normal, but not yet high enough to be diagnosed as type 2 diabetes. Doctors may also call this “intermediate hyperglycemia.”

Having prediabetes doesn’t guarantee you will get diabetes. It’s a critical window of opportunity—a chance to change course, protect your health, and prevent serious problems down the road.

⚠️ Why Should You Care?

Beyond the risk of developing type 2 diabetes, prediabetes increases your chances of heart disease, stroke, kidney disease, and even some cancers. It’s a whole-body health signal, not just a number on a blood test.

🧬 The Two Main Types of Prediabetes

Not all prediabetes is the same. There are two main conditions, and knowing which one you have can help guide the best treatment:

Impaired Fasting Glucose (IFG): Your blood sugar is too high before eating (after a night of fasting).
Impaired Glucose Tolerance (IGT): Your blood sugar is too high after eating or drinking a sugary drink during a test.

These types have different causes and may respond differently to lifestyle changes. For example, weight loss and exercise are proven to work very well for IGT, but their effect on isolated IFG is less clear.

🌍 How Common Is It?

Prediabetes is a global health challenge. In 2024, over 1.1 billion adults worldwide were estimated to have either IFG or IGT. Rates have been steadily rising, and most people don’t even know they have it because there are often no symptoms.

🩸 How Is Prediabetes Diagnosed? (Getting the Full Picture)

Since prediabetes rarely causes symptoms, diagnosis depends entirely on blood tests. Doctors typically use one of three methods. The table below shows the common ranges used by the American Diabetes Association.

Test	What it Measures	Prediabetes Range
Fasting Plasma Glucose	Blood sugar after an 8-hour fast	100–125 mg/dL (5.6–6.9 mmol/L)
Oral Glucose Tolerance Test (OGTT)	Blood sugar 2 hours after drinking a sugary solution	140–199 mg/dL (7.8–11.0 mmol/L)
HbA1c	Average blood sugar over the past 2–3 months	5.7%–6.4% (39–47 mmol/mol)

💡 The Problem with Only One Test

Relying on just a fasting glucose or HbA1c test can miss many people with IGT. The OGTT is often the best way to catch IGT, which is the type most responsive to lifestyle changes. However, the OGTT is less convenient, requiring a blood draw before and 2 hours after a sugary drink.

📋 Who Should Be Screened?

Your doctor should screen you for prediabetes if you have any of these risk factors:

✅ Overweight or obesity (especially excess belly fat)

✅ Age over 45 (risk increases with age)

✅ Family history of type 2 diabetes

✅ Inactive lifestyle

✅ History of gestational diabetes (diabetes during pregnancy) or polycystic ovary syndrome (PCOS)

✅ High blood pressure or abnormal cholesterol

✅ Certain ethnic backgrounds (including Asian, Hispanic, African, and Native American descent)

📝 A Step-by-Step Approach to Diagnosis

Because testing everyone is impractical, a “stepped care” approach is best:

Step 1: Find your risk. Use a simple, non-invasive risk score (like FINDRISC or IDRS) online or at your doctor’s office.

Step 2: Initial blood test. For most people, start with fasting glucose or HbA1c. It’s simple and inexpensive.

Step 3: Confirm with OGTT. If you are at high risk (based on ethnicity, family history, or other factors) and your initial test is normal—or if you are considering an intensive prevention program—an OGTT is crucial to avoid missing IGT.

💪 Managing Prediabetes: How to Turn the Yellow Light Green

The primary goal is to prevent or delay type 2 diabetes. The good news: it works.

🥗 1. Lifestyle Intervention (The Gold Standard)

This is the most effective, safe, and affordable strategy. Major studies from China, Finland, India, and the USA have proven it.

✅ What it is: A structured program focused on weight loss (typically 5–7% of body weight), dietary changes (reducing fat and calories), and increased physical activity (e.g., 150 minutes of walking per week).

✅ The Results: Lifestyle intervention reduces the risk of developing diabetes by 40–60% in people with IGT. These benefits last for decades, reducing heart disease, death, and eye complications.

✅ Who it works for: Proven effective for IGT. The benefit for isolated IFG is unclear and may not be cost-effective.

💊 2. Medications (New Options, New Costs)

Several drugs can help, but most are not officially approved for prediabetes.

✅ Metformin: The oldest and cheapest option. It’s effective, especially for people under 60, those with a high BMI (>35), or women with a history of gestational diabetes. The US Diabetes Prevention Program found it reduced diabetes risk by 31%.

✅ Newer Weight-Loss Drugs (GLP-1 RAs, e.g., liraglutide, semaglutide; and dual GLP-1/GIP RAs, e.g., tirzepatide): These are highly effective at promoting weight loss and reversing prediabetes. In trials, tirzepatide reduced progression to diabetes by over 90% compared to placebo.

⚠️ The Catch: These newer drugs are expensive, and benefits fade once you stop taking them. They are best used as part of a broader strategy, not as a stand-alone “cure.”

⚕️ 3. Metabolic (Bariatric) Surgery

This is the most effective treatment for severe obesity. In people with prediabetes who undergo surgery, up to 82% return to normal blood sugar in the first year, with a very low risk of progressing to diabetes. However, it is invasive and reserved for specific cases.

☀️ 4. Vitamin D

A simple, low-cost option. Pooled analyses of multiple trials suggest that Vitamin D supplementation may reduce the risk of progressing from prediabetes to diabetes by about 15%.

🌍 National Programs: Taking Prevention to Scale

A few countries have launched large-scale diabetes prevention programs based on this evidence.

🇺🇸 USA (National DPP): Since 2012, this lifestyle intervention program has led to significant weight loss and a 40% lower risk of developing diabetes at one year.

🇬🇧 England (NHS DPP): Referral to this program was associated with a 20% reduced risk of progressing to diabetes.

These programs show that what works in research clinics can work in real communities.

💙 Quality of Life, Costs, and What’s Next

😊 Does it improve quality of life?

Yes. Participants in these programs report modest but significant improvements in quality of life linked to better glucose control and weight loss.

💰 Is it cost-effective?

Yes, especially lifestyle interventions. In the US DPP, lifestyle intervention was cost-saving for younger adults and cost-effective for all ages. A real-world study found that enrolling in the National DPP reduced direct medical costs by about $4,600 per person over two years.

🚀 Challenges & The Future

🌍 Global Disparities: In low-income countries, nearly two-thirds of high-risk individuals report no engagement in any prevention activities. We need simpler, culturally tailored strategies.

💪 Adherence is Hard: Staying in a lifestyle program is challenging. Attrition rates are high, especially among younger people and minorities.

🧬 The Heterogeneity Problem: We still don’t know the best way to treat isolated IFG. Future research must move beyond the “one-size-fits-all” approach to stratify individuals by genetic or metabolic risk.

✅ The Bottom Line

Prediabetes is not a disease sentence; it’s a call to action. For most people—especially those with IGT, excess weight, or other risk factors—intensive lifestyle modification is the proven, cost-effective, and sustainable path forward.

New medications offer powerful tools, but their high cost and lack of lasting effect after stopping mean they are not a universal solution. A stepped-care approach, starting with risk scores, using the right diagnostic test (don’t skip the OGTT if you’re at high risk!), and targeting the most effective intervention to the right person, is our best chance to reverse the global tide of type 2 diabetes.

💙 How KSP Health Can Help

At KSP Health, we’re committed to helping you take control of your health before prediabetes progresses to type 2 diabetes. Through our convenient telemedicine services, you can connect with experienced healthcare providers from the comfort of your home.