Several things can bring blood sugar down, ranging from a quick walk and a glass of water to prescription medications like metformin or insulin. What works best depends on whether you’re dealing with an occasional spike after a big meal, consistently elevated numbers, or a more urgent situation where your glucose is well above your target range. Here’s a practical breakdown of your options.
Physical Activity Works Fast
Moving your body is one of the quickest non-medication ways to lower blood sugar. When your muscles contract, they pull glucose out of your bloodstream for energy, even without insulin’s help. A brisk 15 to 30 minute walk after eating can noticeably blunt a post-meal spike. You don’t need intense exercise. Light to moderate activity like walking, cycling, or even cleaning the house gets the job done.
One caution: if your blood sugar is above 240 mg/dL and you have type 1 diabetes (or type 2 and use insulin), check for ketones before exercising. Working out with high ketone levels can push blood sugar even higher.
Drinking Water Helps Your Kidneys Clear Glucose
When blood sugar is elevated, your kidneys work harder to filter the excess glucose out through urine. Drinking water supports that process by keeping you hydrated and helping your kidneys flush glucose more efficiently. Dehydration does the opposite. High glucose levels actually impair your kidneys’ protective mechanisms during dehydration, making it harder for them to concentrate urine and reabsorb water properly. This can lead to a cycle where dehydration worsens high blood sugar, and high blood sugar worsens dehydration.
There’s no precise amount that’s been clinically validated for bringing glucose down, but steadily sipping water throughout the day (rather than sugary drinks or juice) is a simple first step when you notice your numbers climbing.
Soluble Fiber Slows Sugar Absorption
Soluble fiber dissolves in water and forms a gel-like material in your stomach that slows digestion. This means glucose enters your bloodstream more gradually instead of all at once, which helps prevent sharp spikes after meals. Good sources include oats, beans, peas, apples, bananas, avocados, citrus fruits, carrots, barley, and psyllium husk supplements.
Building more of these foods into your regular meals has a cumulative effect. People with diabetes who eat higher-fiber diets tend to have better blood sugar levels overall, particularly when they focus on soluble fiber. If you’re not used to eating much fiber, increase gradually to avoid digestive discomfort.
Choosing the Right Foods at Your Next Meal
If your blood sugar is running high, what you eat next matters. Pairing carbohydrates with protein, fat, or fiber slows the rate at which glucose hits your bloodstream. A piece of bread alone will spike you faster than bread with peanut butter or cheese. Swapping refined carbs (white rice, white bread, sugary snacks) for whole grains, non-starchy vegetables, and legumes makes a measurable difference over time.
Portion size is the other lever you can pull immediately. Even healthy carbs raise blood sugar when you eat a lot of them at once. Reducing your carb portion at a single meal, rather than cutting carbs entirely, is often enough to keep post-meal numbers closer to your target.
Prescription Medications for Ongoing Control
When lifestyle changes aren’t enough to keep blood sugar in range, medications step in. The most commonly prescribed options work through different mechanisms.
Metformin is typically the first medication prescribed for type 2 diabetes. It works in two ways: it reduces the amount of sugar your liver releases into your bloodstream, and it makes your cells more responsive to insulin. It’s been used for decades and remains a cornerstone of treatment.
SGLT2 inhibitors (including empagliflozin and dapagliflozin) take a different approach. They prevent your kidneys from reabsorbing glucose, so more sugar leaves your body through urine. These medications also carry heart and kidney benefits for many people with type 2 diabetes.
GLP-1 receptor agonists (including semaglutide and dulaglutide) trigger your body to release insulin when blood sugar rises. They also slow stomach emptying and reduce appetite, which is why some of these drugs are also prescribed for weight management. Tirzepatide works through a similar but dual mechanism, targeting two hormones involved in blood sugar regulation.
How Insulin Brings Blood Sugar Down Quickly
For people who take insulin, it’s the most direct and fastest tool for lowering a high reading. Rapid-acting insulin starts working within about 15 minutes, peaks at around 1 hour, and lasts 2 to 4 hours. Regular (short-acting) insulin kicks in within 30 minutes, peaks at 2 to 3 hours, and lasts 3 to 6 hours.
If you already have a correction dose prescribed by your doctor, a rapid-acting insulin dose is the most reliable way to bring down a spike. Stacking doses (taking more insulin before the first dose has finished working) is risky because the effects overlap and can send you too low. Always wait for your current dose to peak before deciding if you need more.
Supplements With Some Evidence
Berberine is the supplement with the strongest research behind it for blood sugar. A large meta-analysis found that berberine supplementation reduced fasting blood glucose by about 7.7 mg/dL on average and lowered HbA1c (a marker of long-term blood sugar control) by about 0.45 percentage points. Those are modest but real effects. Most studies used doses around 1 to 1.8 grams per day, split into multiple doses with meals. Berberine can interact with certain medications, particularly metformin, so it’s worth discussing with a pharmacist or doctor before adding it.
Cinnamon is widely promoted for blood sugar, but the evidence is much weaker. Studies haven’t consistently shown meaningful glucose reductions, and it’s often unclear which type of cinnamon was even tested. It’s unlikely to cause harm in normal culinary amounts, but it shouldn’t be relied on as a blood sugar strategy.
Avoiding a Drop That Goes Too Low
Any effort to bring blood sugar down carries the risk of overshooting. Blood sugar below 70 mg/dL is considered low, and below 54 mg/dL is severe. Early symptoms of a low include a fast heartbeat, shaking, sweating, anxiety, dizziness, and sudden hunger. If it drops further, you may feel weak, have trouble seeing clearly, become confused, or in rare cases have a seizure or pass out.
This risk is highest with insulin and certain oral medications that directly stimulate insulin release. Lifestyle strategies like walking or drinking water are much less likely to cause a dangerous low. If you’re taking medication and actively trying to bring a high reading down, check your levels more frequently until you’re back in range. Keep a fast-acting carb source nearby (glucose tablets, juice, or regular soda) so you can respond quickly if you overcorrect.