You can reduce high blood sugar through a combination of food choices, physical activity, sleep, stress management, and, when needed, medication. The American Diabetes Association recommends most nonpregnant adults with diabetes aim for fasting blood sugar between 80 and 130 mg/dL before meals and under 180 mg/dL one to two hours after eating. If your numbers are consistently above those targets, the strategies below can make a real difference.
Choose Foods That Release Sugar Slowly
Not all carbohydrates hit your bloodstream at the same speed. The glycemic index (GI) ranks foods on a scale of 0 to 100 based on how quickly they raise blood sugar. Foods scoring 55 or below are considered low-GI, 56 to 69 are moderate, and 70 or above are high. But GI alone doesn’t tell the whole story, because it doesn’t account for how much you actually eat. That’s where glycemic load (GL) comes in: a GL of 10 or below is low, 11 to 19 is intermediate, and 20 or above is high.
This distinction matters in practice. Watermelon has a high GI of 76, but because a typical serving contains relatively little carbohydrate, its GL is only 8. A bowl of white rice, on the other hand, has a moderate GI of 66 but a GL of 35, meaning it delivers a heavy glucose hit per serving. A baked russet potato tops the charts with a GI of 111 and a GL of 33.
Some of the best swaps for blood sugar control:
- Instead of white bread (GI 71), try whole-grain pumpernickel (GI 46, GL 5).
- Instead of cornflakes (GI 79, GL 20), try All-Bran cereal (GI 45, GL 10).
- Instead of white spaghetti cooked soft (GI 58, GL 25), try whole-meal spaghetti (GI 32, GL 14).
- Instead of white rice (GI 66, GL 35), try pearled barley (GI 28, GL 11) or lentils (GI 29, GL 7).
Fruits like apples (GI 39, GL 6), pears (GI 38, GL 4), and oranges (GI 42, GL 5) are solid choices. Nuts are especially gentle on blood sugar: cashews have a GI of 25 and a GL of just 2, peanuts even lower at GI 18 and GL 1. Pairing a higher-GI food with protein, fat, or fiber slows digestion and blunts the glucose spike, so adding peanut butter to toast or cheese to crackers is a simple but effective tactic.
Move Your Body After Meals
Physical activity lowers blood sugar through a mechanism that works independently of insulin. When your muscles contract, they pull glucose out of your bloodstream and use it for energy whether insulin is available or not. That makes exercise one of the most immediate tools you have. A 10- to 15-minute walk after a meal can noticeably reduce your post-meal glucose spike.
The benefits extend well beyond the workout itself. Your body stays more sensitive to insulin for up to 24 hours after a single session of activity. Both aerobic exercise (walking, cycling, swimming) and resistance training (weights, resistance bands, bodyweight exercises) improve insulin sensitivity. Combining both types throughout the week gives you the broadest benefit. Most guidelines recommend at least 150 minutes of moderate aerobic activity per week, spread across several days rather than crammed into one or two sessions.
If you’re starting from a sedentary baseline, even small increases matter. Replacing 30 minutes of sitting with light movement throughout the day can improve your average glucose levels. You don’t need a gym membership. Brisk walking is one of the most well-studied and accessible options.
Prioritize Sleep
Poor sleep directly undermines blood sugar control. When you’re sleep-deprived, your body becomes less responsive to insulin, meaning the same amount of glucose in your blood takes longer to clear. Your body also ramps up production of cortisol, a stress hormone that signals the liver to release stored glucose. The result is higher fasting blood sugar in the morning, even if you ate well the day before.
Most adults need seven to nine hours per night. Consistency matters nearly as much as duration. Going to bed and waking up at roughly the same time each day helps regulate the hormonal cycles that influence blood sugar. If you have trouble sleeping, practical fixes like keeping your room cool and dark, avoiding screens for an hour before bed, and limiting caffeine after midday tend to be more sustainable than supplements.
Manage Stress Directly
Stress raises blood sugar through the same cortisol pathway as poor sleep. When you’re under chronic stress, your body stays in a state of elevated glucose production as part of the fight-or-flight response. This can keep your numbers stubbornly high even when your diet and exercise are on point.
The most effective stress-reduction techniques are the ones you’ll actually do consistently. Deep breathing exercises, meditation, yoga, time outdoors, and regular social connection all have documented effects on cortisol levels. Even five minutes of slow, controlled breathing (inhaling for four counts, exhaling for six) can measurably lower cortisol within a single session. The goal isn’t to eliminate stress but to build in regular moments of recovery so your body isn’t flooded with glucose-raising hormones around the clock.
Consider Your Eating Window
When you eat may matter alongside what you eat. A pattern called 16/8 time-restricted eating, where you consume all your food within an eight-hour window and fast for the remaining 16 hours, has shown modest but consistent benefits for blood sugar. A meta-analysis of 18 studies covering over 1,100 participants found that this approach significantly reduced fasting glucose, fasting insulin, and insulin resistance compared to a standard eating schedule. Studies lasting longer than six months also showed meaningful improvements in A1C, the marker that reflects average blood sugar over roughly three months.
The improvements are small, not dramatic, and time-restricted eating works best as one piece of a larger strategy rather than a standalone fix. If you tend to snack late into the evening, simply moving your last meal earlier and giving your body a longer overnight fast is a practical place to start. You don’t need to follow a rigid protocol. Finishing dinner by 7 or 8 p.m. and eating breakfast after 10 or 11 a.m. captures most of the benefit.
Check Your Magnesium Intake
Magnesium plays a key role in how your body processes insulin, and many people don’t get enough of it. In a randomized controlled trial, obese individuals who were insulin-resistant but not yet diabetic took 365 mg of supplemental magnesium daily for six months. They saw significant drops in fasting glucose, fasting insulin, and insulin resistance, along with improved insulin sensitivity.
Good food sources include spinach, pumpkin seeds, almonds, black beans, and dark chocolate. If you suspect your intake is low, a supplement in the 300 to 400 mg range (elemental magnesium) is the dose range supported by trial data. Magnesium glycinate and magnesium citrate tend to be better absorbed than magnesium oxide. This isn’t a replacement for dietary changes or physical activity, but it can fill a gap that quietly makes everything else less effective.
Know the Warning Signs of a Crisis
Most high blood sugar can be managed gradually with lifestyle changes and, if prescribed, medication adjustments. But extremely high levels require urgent medical attention. If blood sugar climbs above 600 mg/dL, it can trigger a dangerous condition called hyperosmolar hyperglycemic state, which involves severe dehydration, confusion, and in some cases seizures or loss of consciousness. Diabetic ketoacidosis is another emergency, more common in type 1 diabetes, where the body breaks down fat for energy and produces toxic levels of acids called ketones.
Warning signs that need immediate attention include excessive thirst, frequent urination that won’t stop, fruity-smelling breath, nausea or vomiting, confusion, and extreme fatigue. If you notice these symptoms alongside very high blood sugar readings, treat it as an emergency rather than something to address at your next appointment.
Putting It Together
No single change will fix high blood sugar on its own. The people who see the biggest improvements typically layer several strategies: swapping high-GL carbohydrates for lower ones, walking after meals, sleeping enough, managing stress, and paying attention to meal timing. Each of these individually produces a modest effect. Together, they compound. Track your blood sugar if you can, because seeing how specific foods and habits affect your numbers turns abstract advice into personal data you can act on.