High blood glucose comes down through a combination of dietary changes, physical activity, hydration, stress management, and in some cases medication. A normal fasting blood sugar is below 100 mg/dL, and a normal reading two hours after eating is below 140 mg/dL. If your numbers are consistently above those thresholds, you’re in prediabetes territory (fasting 100–125 mg/dL) or diabetes range (fasting 126 mg/dL or higher). The good news: each of the strategies below can meaningfully move those numbers in the right direction.
Know Your Numbers First
Before you can fix high glucose, you need to understand how high it actually is. Fasting blood sugar between 100 and 125 mg/dL indicates prediabetes, while 126 mg/dL or above on two separate tests means diabetes. After a meal, anything between 140 and 199 mg/dL two hours later falls in the prediabetes range, and 200 mg/dL or higher indicates diabetes. A random reading of 200 mg/dL or above, regardless of when you last ate, also suggests diabetes.
These thresholds matter because the approach changes depending on where you fall. Prediabetes responds well to lifestyle changes alone. Established diabetes often requires those same changes plus medication. And readings above 250 mg/dL with symptoms like nausea, confusion, or fruity-smelling breath can signal a medical emergency called diabetic ketoacidosis, which needs immediate hospital care.
Restructure What You Eat
The single biggest lever for blood sugar control is the food on your plate. Foods are ranked on the glycemic index (GI) from 0 to 100 based on how sharply they raise blood sugar. Low-GI foods (55 or below) cause a slow, gentle rise. High-GI foods (70 and above) cause a rapid spike. The goal is to shift most of your meals toward the lower end of that scale.
Low-GI foods include green vegetables, most fruits, raw carrots, kidney beans, chickpeas, and lentils. Medium-GI foods (56–69) include sweet corn, bananas, oat cereals, and multigrain bread. High-GI foods that cause the biggest spikes include white rice, white bread, and potatoes. You don’t need to eliminate high-GI foods entirely, but pairing them with protein, fat, or fiber slows their absorption and blunts the glucose spike.
Fiber deserves special attention. It slows the rate at which sugar enters your bloodstream and helps stabilize levels between meals. The Dietary Guidelines for Americans recommend 22 to 34 grams of fiber per day depending on age and sex, but most people get roughly half that. Beans, lentils, oats, vegetables, and whole fruits are the most practical sources. Adding a serving of legumes to one meal a day can make a noticeable difference in your post-meal readings within weeks.
Use Exercise as a Glucose Tool
Physical activity pulls glucose out of your bloodstream and into your muscles, where it’s burned for energy. This happens with or without insulin, which is why a walk after dinner can visibly lower a post-meal spike on a glucose monitor. Current guidelines recommend at least 150 minutes of moderate aerobic exercise per week (brisk walking, cycling, swimming) plus resistance training on two days, with no more than two consecutive rest days.
Both types of exercise matter, but they work differently. Aerobic exercise improves your cardiovascular fitness and burns glucose during the activity itself. Resistance training, like weight lifting or bodyweight exercises, builds muscle tissue that acts as a larger “sink” for glucose around the clock. People who do both see improvements in body composition, blood lipid levels, and overall insulin needs. Even 10 to 15 minutes of walking after meals has a measurable effect on post-meal glucose, making it one of the simplest interventions available.
Stay Well Hydrated
Dehydration directly worsens blood sugar readings. When your body is low on water, it releases a hormone called vasopressin to conserve fluid at the kidneys. Vasopressin also raises blood glucose. In one study of people with type 2 diabetes, just three days of reduced water intake led to significantly higher blood sugar during glucose testing compared to when the same people were properly hydrated.
High blood sugar itself creates a vicious cycle: excess glucose in the blood pulls water into the urine, causing you to urinate more and become more dehydrated, which pushes glucose even higher. Drinking water consistently throughout the day helps break this cycle. Plain water is ideal. Sugary drinks, fruit juices, and sodas add glucose on top of whatever your body is already struggling to process.
Manage Stress and Sleep
Cortisol, the body’s primary stress hormone, directly opposes insulin. It tells your liver to release stored glucose into the bloodstream, which made sense when human stress meant running from predators but works against you when the stress is a difficult boss or financial worry. Research has found a significant association between higher cortisol levels and increased insulin resistance, even in otherwise healthy individuals. Insomnia and a sedentary lifestyle both independently contributed to the same pattern.
Poor sleep is one of the most underappreciated drivers of high glucose. Even a few nights of inadequate rest can increase cortisol, reduce insulin sensitivity, and raise fasting blood sugar. Prioritizing seven to eight hours of sleep, keeping a consistent wake time, and finding a stress management practice that works for you (whether that’s walking, deep breathing, or something else) can produce real improvements in your numbers over time.
When Medication Enters the Picture
If lifestyle changes alone aren’t bringing your glucose into range, medication is the next step. The most commonly prescribed oral medication for type 2 diabetes works by reducing the amount of glucose your liver produces and releases into the bloodstream. It also makes your muscle tissue more responsive to insulin, so cells absorb glucose more efficiently. Most people tolerate it well, and it has decades of safety data behind it.
Medication isn’t a replacement for the dietary and exercise strategies above. It works best in combination with them. Many people with type 2 diabetes who adopt significant lifestyle changes can eventually reduce their medication dose or, in some cases, come off it entirely, particularly if they catch the problem early in the prediabetes or early diabetes stage.
Track Your Progress
Continuous glucose monitors have made it possible to see your blood sugar in real time, which transforms glucose management from guesswork into a feedback loop. You can see exactly how a particular meal, a walk, a stressful meeting, or a poor night of sleep affects your numbers. The American Diabetes Association recommends aiming for “time in range,” the percentage of the day your glucose stays between 70 and 180 mg/dL. The target for most people is at least 70% of readings in range, which works out to roughly 17 out of 24 hours.
If a continuous monitor isn’t accessible, a standard fingerstick glucometer works well. Check your fasting glucose in the morning and your levels two hours after your largest meal. Those two data points, tracked over weeks, will tell you whether your changes are working. Small, consistent improvements in those numbers reflect real metabolic progress, even before they show up on a lab test at your next checkup.
Simple Habits That Add Up
A few smaller strategies can complement the major changes above. Vinegar consumed with a meal has been shown in a pooled analysis of clinical trials to significantly reduce post-meal glucose and insulin levels. A tablespoon of apple cider vinegar diluted in water before or during a carb-heavy meal is the most common approach. It’s not a cure, but it’s a low-cost addition to your routine.
Meal sequencing also helps. Eating vegetables and protein before the carbohydrate portion of your meal slows gastric emptying and reduces the glucose spike. Keeping portions of refined carbohydrates moderate, choosing whole grains over processed versions, and spacing meals three to five hours apart rather than grazing continuously all contribute to smoother glucose curves throughout the day.