Fasting Blood Glucose 113 mg/dL: Is That High?

Is Fasting Blood Glucose 113 mg/dL Low, Normal, or High?

Fasting glucose 113 mg/dL falls in the prediabetes range and is higher than normal. The American Diabetes Association classifies fasting glucose between 100 and 125 mg/dL as prediabetes, also called impaired fasting glucose. This does not mean you have diabetes, but it does mean your body is showing early signs of difficulty managing blood sugar. The encouraging part is that prediabetes is often reversible with the right changes.

Your fasting blood glucose of 113 mg/dL clearly indicates prediabetes, a critical warning sign that your body is beginning to struggle with blood sugar regulation. This value sits noticeably above the normal range of 70-99 mg/dL, showing your system is consistently keeping glucose levels higher than ideal even after an overnight fast. At this specific level, common contributing factors often revolve around lifestyle, such as a diet high in refined carbohydrates and sugars, coupled with insufficient physical activity, which can lead to increased insulin resistance. While a family history of type 2 diabetes also plays a role, for many, this elevation is a direct consequence of modifiable habits. Following this result, your healthcare provider will typically recommend additional assessments like a confirmatory fasting glucose test, an HbA1c to gauge your average blood sugar over the past few months, or potentially an Oral Glucose Tolerance Test (OGTT). It's vital to understand that prediabetes, specifically at this level, is not a life sentence; it’s a powerful opportunity. Unlike full-blown type 2 diabetes, this condition is often reversible through targeted dietary changes and increased physical activity, effectively preventing progression if addressed promptly and consistently. This initial detection provides a crucial window for intervention, offering significant control over your future health trajectory.

Hidden Risk of Fasting Blood Glucose 113 mg/dL

Fasting glucose of 113 mg/dL might not feel like a big deal because prediabetes rarely causes noticeable symptoms. That is exactly what makes it risky. The CDC estimates that more than 80 percent of people with prediabetes do not know they have it, and without intervention, up to 30 percent will develop type 2 diabetes within five years.

A fasting blood glucose reading of 113 mg/dL indicates a state of prediabetes, signaling an increased risk of developing type 2 diabetes. While not yet diabetes, this elevated level suggests that your body's cells are becoming less responsive to insulin, a condition known as insulin resistance. Over time, this persistent resistance can lead to higher glucose levels, which in turn can damage blood vessels throughout your body. This microvascular and macrovascular damage is the underlying mechanism for future complications, including nerve damage (neuropathy), kidney disease (nephropathy), eye problems (retinopathy), and cardiovascular issues like heart attack and stroke. Early intervention at this stage is crucial to prevent or delay these serious downstream effects.

• Prediabetes damages blood vessels and nerves even before blood sugar reaches the diabetes threshold. The harmful effects start well before diagnosis
• People with prediabetes have a 50 percent higher risk of heart disease and stroke compared to those with normal blood sugar, according to the American Heart Association
• Elevated fasting glucose often occurs alongside other metabolic issues like high blood pressure, high triglycerides, and excess belly fat, a cluster known as metabolic syndrome
• The progression from prediabetes to diabetes is not inevitable. Research from the National Institutes of Health shows that lifestyle changes reduce the risk by 58 percent
• Waiting for symptoms to appear before taking action means losing the window when intervention is most effective

What Does a Fasting Blood Glucose Level of 113 mg/dL Mean?

Glucose is the sugar your body uses as its primary energy source. When you eat, carbohydrates are broken down into glucose and released into your bloodstream. Your pancreas responds by releasing insulin, the hormone that allows glucose to enter your cells. Fasting glucose is measured after 8 or more hours without eating and reflects how well your body manages blood sugar without food coming in.

A fasting blood glucose level of 113 mg/dL, falling into the prediabetes range, often stems from a combination of factors rather than a single cause. A primary driver is typically consistent consumption of high-glycemic index foods and added sugars, which can overwhelm the body's ability to manage glucose effectively, especially if combined with a sedentary lifestyle. Reduced physical activity diminishes insulin sensitivity, making it harder for cells to take up glucose. Certain medications, like corticosteroids or some antipsychotics, can also directly impact glucose metabolism and contribute to this reading. Less commonly, underlying endocrine conditions or early stages of pancreatic dysfunction might play a role.

At 113 mg/dL, your fasting glucose is about 13 points above the normal ceiling of 99 mg/dL. What this tells you is that your body is starting to struggle with insulin's job. Either your pancreas is not producing quite enough insulin, or your cells are becoming resistant to the insulin that is there. In most cases of prediabetes, it is insulin resistance. Your cells are not responding to insulin as efficiently as they should, so glucose builds up in the bloodstream instead of moving into cells.

Insulin resistance usually develops gradually over months or years. It is closely tied to carrying excess weight, especially visceral fat around the abdomen. But it can also happen in people who appear lean, particularly if they have a family history of diabetes or lead a sedentary lifestyle.

The body compensates for insulin resistance by producing more insulin. For a while, this keeps blood sugar close to normal. But over time, the pancreas cannot keep up with the increasing demand. That is when fasting glucose starts climbing, first into the prediabetes range and eventually, if nothing changes, into diabetes territory.

Lifestyle Changes for Fasting Blood Glucose 113 mg/dL

Physical activity is the single most powerful tool for reversing prediabetes. The landmark Diabetes Prevention Program study, published by the NIH, showed that 150 minutes of moderate exercise per week reduced the risk of developing diabetes by 58 percent, outperforming medication. Walking briskly for 30 minutes five days a week meets this target.

Given your fasting blood glucose of 113 mg/dL, the immediate next step is to schedule a follow-up A1C test within three to six months to confirm the trend and assess average blood sugar over the past few months. Concurrently, prioritize a significant dietary shift towards whole, unprocessed foods, reducing refined carbohydrates and sugary beverages. Aim for at least 150 minutes of moderate-intensity aerobic exercise per week, such as brisk walking or cycling, to improve insulin sensitivity. Begin tracking your daily food intake and physical activity to identify patterns. While not yet requiring a specialist, discussing these results with your primary care provider is essential for personalized guidance and monitoring.

Weight loss amplifies the effect. Losing just 5 to 7 percent of your body weight, roughly 10 to 14 pounds for someone weighing 200 pounds, significantly improves insulin sensitivity. You do not need to reach an ideal weight. Even modest, sustainable weight loss makes a measurable difference in how your body handles glucose.

Strength training is especially valuable for blood sugar management. Muscle tissue absorbs glucose directly from the bloodstream during exercise and improves insulin sensitivity for hours afterward. Adding two to three sessions of resistance exercise per week, even bodyweight exercises like squats and push-ups, gives your glucose metabolism a meaningful boost.

Sleep quality directly affects insulin resistance. Studies show that sleeping fewer than six hours per night or having disrupted sleep increases the risk of type 2 diabetes independent of other factors. Prioritize seven to nine hours of quality sleep. If you snore heavily or wake up feeling unrested, consider talking to your doctor about sleep apnea, which is both common and treatable.

Chronic stress raises cortisol levels, and cortisol tells your liver to dump more glucose into the bloodstream. Regular stress management, whether through exercise, time outdoors, deep breathing, or social connection, supports better blood sugar regulation.

Written by

Ernestas K.

Clinical research writer specializing in human health, biology, and preventive medicine.

Reviewed against ADA, CDC, NIH, WHO, Mayo Clinic guidelines · Last reviewed March 20, 2026