Prediabetes Prevention: Your Comprehensive Nutrition & Lifestyle Guide

Overview

Prediabetes is a reversible health condition where your blood sugar (glucose) levels are higher than normal, but not high enough to be diagnosed with type 2 diabetes. It is a warning sign that your body is struggling to process sugar properly, often due to insulin resistance, a condition where your cells don’t respond well to the hormone insulin that regulates blood sugar. An estimated 1 in 3 U.S. adults have prediabetes, and 80% of them are unaware they have it, making early prevention and action critical to avoid long-term health complications.

Signs & Symptoms

Most people with prediabetes experience no obvious symptoms, which is why routine blood sugar testing during annual checkups is so important for early detection. A small number of people may notice subtle, easy-to-miss signs, including increased thirst, more frequent urination, unexplained fatigue, or blurred vision. If you have risk factors for prediabetes, talk to your provider about getting tested even if you feel well.

Causes & Risk Factors

Prediabetes develops when your body becomes resistant to insulin, causing sugar to build up in your bloodstream instead of being used for energy. While some risk factors like age and family history can’t be changed, many modifiable factors (like diet and activity level) play a major role in your risk. Common risk factors include:

• Being overweight or obese, especially with excess weight around the waist
• Being 45 years of age or older
• Having a close family member with type 2 diabetes
• Being physically inactive (less than 3 days of moderate activity per week)
• Having a history of gestational diabetes or giving birth to a baby weighing more than 9 pounds
• Having polycystic ovary syndrome (PCOS)
• Identifying as Black, Hispanic/Latino, Indigenous, Asian American, or Pacific Islander, groups with higher rates of prediabetes

Diagnosis

Prediabetes is diagnosed with simple, routine blood tests, often done during an annual physical. The two most common tests used to measure blood sugar levels are the fasting plasma glucose (FPG) test, which measures blood sugar after an overnight fast, and the hemoglobin A1c (HbA1c) test, which measures your average blood sugar over the past 2–3 months. Your provider may use one or both tests to confirm a diagnosis.

Treatment & Management

The best way to prevent prediabetes, or reverse it if you have already been diagnosed, is to make small, sustainable changes to your diet, activity level, and daily habits. These changes improve your body’s insulin sensitivity and help keep your blood sugar in a healthy range. Key evidence-based steps include:

• Fill half your plate with non-starchy vegetables at every meal: Leafy greens, broccoli, peppers, and carrots are high in fiber and low in calories, which help stabilize blood sugar and keep you full.
• Choose whole, unrefined carbohydrates: Opt for whole grains (oats, quinoa, brown rice), whole fruits, beans, and lentils over white bread, pastries, and sugary cereals.
• Limit added sugars and sugary drinks: Soda, sweetened coffee, fruit juices, and candy cause rapid blood sugar spikes and increase insulin resistance over time.
• Control portion sizes: Use the simple plate method to balance your meals: ½ plate non-starchy veggies, ¼ lean protein, ¼ whole grains or starchy veggies.
• Aim for at least 150 minutes of moderate aerobic activity (like brisk walking, cycling, or swimming) per week, plus 2 days of strength training. Even small increases in daily movement, like taking the stairs or walking after meals, help improve insulin sensitivity.
• Reduce ultra-processed food intake: Packaged snacks, fast food, and frozen meals often contain hidden added sugars, unhealthy fats, and excess sodium that raise prediabetes risk.

Living With It

If you have been diagnosed with prediabetes or are at high risk, focus on building consistent, enjoyable habits rather than following restrictive, short-term diets. Work with your healthcare provider or a registered dietitian to create a plan that fits your lifestyle, cultural food preferences, and health goals. Regular follow-up blood tests will help you track your progress and adjust your plan as needed, and many people are able to bring their blood sugar back to the normal range with sustained lifestyle changes.