You can lower high blood sugar through a combination of movement, food choices, hydration, and lifestyle adjustments. Most strategies work within hours, while others build better blood sugar control over weeks. The approach that works best depends on whether you’re dealing with a temporary spike or a pattern of elevated readings.
Move Your Body, Even Briefly
Physical activity is one of the fastest ways to pull glucose out of your bloodstream. When your muscles contract, they absorb sugar from the blood for fuel, and they do this even without insulin. A walk after a meal, a set of bodyweight squats, or 15 to 20 minutes of any activity that gets you breathing harder can make a noticeable difference in your next reading.
The benefits extend well beyond the workout itself. Exercise makes your cells more responsive to insulin for up to 24 hours afterward, according to the American Diabetes Association. That means a morning walk can help keep your blood sugar steadier through dinner. You don’t need intense exercise to see results. Brisk walking, cycling, swimming, or even yard work all count. The key is consistency: regular movement over days and weeks produces a compounding effect on blood sugar control that a single session can’t match.
If your blood sugar is above 240 mg/dL, check for ketones before exercising. When ketones are present, physical activity can actually push blood sugar higher. A simple urine test strip, available at most pharmacies, can tell you whether it’s safe to work out.
Pair Carbohydrates With Protein and Fat
Eating carbohydrates alone causes a faster, taller spike in blood sugar than eating those same carbohydrates alongside protein or fat. Adding chicken to rice, spreading peanut butter on toast, or drizzling olive oil over pasta slows the rate at which sugar enters your bloodstream. Your body has more time to process it, and the spike is smaller.
The order in which you eat also matters. Starting a meal with vegetables or protein before touching the starchy portion has been shown to reduce post-meal glucose. This works because fiber and protein slow gastric emptying, giving your pancreas a more manageable workload. You don’t need to measure precise ratios. Just avoid eating refined carbohydrates in isolation, and your readings will reflect the difference.
Add More Fiber to Your Meals
Soluble fiber forms a gel-like substance in your gut that slows sugar absorption. A meta-analysis of randomized controlled trials in people with type 2 diabetes found that roughly 8 grams of soluble fiber per day produced meaningful improvements in blood sugar control. That’s the amount in about one and a half cups of cooked oatmeal, a cup of black beans, or two medium pears.
Spreading your fiber intake across meals rather than loading it into one sitting gives you the most consistent effect. Good sources include oats, barley, lentils, chickpeas, apples, flaxseeds, and Brussels sprouts. If you’re not used to eating much fiber, increase gradually over a week or two to avoid bloating.
Drink More Water
When blood sugar is elevated, your kidneys work to filter out the excess glucose through urine. Staying well hydrated supports this process. Dehydration concentrates the sugar in your blood, which can make readings look worse and leaves your kidneys with less fluid to do their job. If you notice you’re urinating frequently and feeling thirsty, those are signs your body is already trying to flush glucose, and it needs water to keep up.
Plain water is ideal. Sugary drinks, fruit juice, and regular soda will do the opposite of what you want. If plain water feels boring, sparkling water or water with a squeeze of lemon works just as well.
Prioritize Sleep
Poor sleep directly worsens blood sugar control. A study published in the journal Diabetes found that healthy men who slept only five hours per night for one week experienced a 20% reduction in insulin sensitivity. That means their bodies needed significantly more insulin to move the same amount of sugar out of the blood. The effect was measurable by two different testing methods, confirming it wasn’t a fluke.
This happens partly because sleep deprivation raises cortisol, a stress hormone that tells your liver to release more glucose. It also disrupts hunger hormones, making you crave high-carb foods the next day. If you’re doing everything else right but skimping on sleep, your blood sugar may stay stubbornly high. Seven to eight hours is the range most consistently linked with better metabolic health.
Consider Magnesium
Magnesium plays a direct role in how your body processes insulin, and many people with high blood sugar are low in it. A randomized, placebo-controlled trial found that 365 mg of supplemental magnesium per day for six months significantly lowered fasting blood sugar, fasting insulin, and insulin resistance in obese, insulin-resistant individuals who didn’t yet have diabetes.
Foods rich in magnesium include pumpkin seeds, almonds, spinach, black beans, and dark chocolate. If your diet is low in these, a supplement may help fill the gap. Magnesium glycinate and magnesium citrate are the forms most easily absorbed.
Try Vinegar Before Meals
A small but growing body of evidence suggests that vinegar can blunt post-meal blood sugar spikes. One study found that people who consumed about 2 tablespoons of apple cider vinegar daily for eight weeks saw their A1C drop from 9.2% to 7.8%, a substantial improvement. The acetic acid in vinegar appears to slow carbohydrate digestion and improve insulin sensitivity.
If you want to try this, dilute 1 to 2 tablespoons in a glass of water and drink it shortly before a carb-heavy meal. Don’t drink it straight, as undiluted vinegar can damage tooth enamel and irritate your throat. This isn’t a replacement for other strategies, but it’s a low-cost addition that may help.
Manage Stress Actively
Stress raises blood sugar even if you haven’t eaten anything. When you’re anxious, angry, or under pressure, your body releases cortisol and adrenaline, both of which signal the liver to dump stored glucose into the bloodstream. This is a survival mechanism designed for running from danger, not for sitting in traffic or worrying about a deadline.
The fix doesn’t have to be meditation, though that works for some people. Anything that genuinely lowers your stress level counts: a 10-minute walk outside, slow deep breathing, calling a friend, or putting your phone down for an hour. If you notice that your blood sugar spikes at predictable, stressful times of day, that pattern itself is useful information. It tells you the spike isn’t entirely about food.
When High Blood Sugar Becomes an Emergency
Most blood sugar spikes can be managed at home with the strategies above. But certain thresholds require immediate attention. If your blood sugar reads 240 mg/dL or higher, test your urine for ketones right away. A positive ketone test means your body has started breaking down fat for fuel in a way that can turn dangerous, potentially leading to diabetic ketoacidosis.
Symptoms that signal a crisis include nausea or vomiting, fruity-smelling breath, confusion, rapid breathing, and extreme thirst that doesn’t improve with water. These can develop over hours, not days. If ketones are present alongside a very high reading, or if you’re experiencing any of these symptoms, get emergency medical care rather than trying to manage it on your own.