You can lower your blood sugar through a combination of dietary changes, physical activity, specific supplements, and prescription medications, depending on how high your levels are and whether you have a diabetes diagnosis. The American Diabetes Association recommends fasting blood sugar between 80 and 130 mg/dL for most adults with diabetes, and below 180 mg/dL within two hours of eating. If your numbers are above those targets, there are several evidence-backed options worth knowing about.
Exercise: The Fastest Non-Drug Option
Physical activity is one of the most immediate ways to bring blood sugar down. When your muscles contract, they pull glucose out of your bloodstream for energy, and this effect continues well after you stop moving. A single workout can improve your body’s sensitivity to insulin for up to 24 hours afterward.
How much your blood sugar drops depends on the duration and intensity of the activity, your current levels, and your fitness baseline. Even a 15-minute walk after a meal can meaningfully blunt a post-meal spike. For ongoing management, consistency matters more than intensity. Regular moderate activity, whether that’s brisk walking, cycling, or swimming, keeps your cells responsive to insulin between workouts too.
Dietary Changes That Work Quickly
What you eat and how you eat it can shift your blood sugar numbers within a single meal. The biggest lever is reducing refined carbohydrates (white bread, sugary drinks, white rice) and replacing them with fiber-rich whole foods. Soluble fiber, the kind found in oats, beans, lentils, and many vegetables, slows the absorption of sugar into your bloodstream. A landmark study published in the New England Journal of Medicine found that people with diabetes who ate 50 grams of fiber daily managed their glucose levels significantly better than those who ate less. Most people eat about half that amount.
Pairing carbohydrates with protein, fat, or fiber at every meal also flattens the glucose curve. Eating a chicken breast with your rice, or adding avocado to your toast, slows digestion and prevents the sharp spike you’d get from carbs alone. Meal order matters too. Some research suggests eating vegetables and protein before the starchy portion of your meal reduces post-meal glucose.
Apple Cider Vinegar Before Meals
Vinegar has consistent evidence for blunting the blood sugar response to carb-heavy meals. About 2 to 6 tablespoons (10 to 30 mL) of vinegar taken before or with a carbohydrate-rich meal can meaningfully improve your glucose response. In one study, insulin-resistant individuals who consumed 30 mL of apple cider vinegar before a 75-gram carbohydrate meal saw a better glycemic response than those given a placebo. Dilute it in water to protect your tooth enamel, and take it right before eating for the best effect.
Supplements With Clinical Evidence
A few supplements have enough research behind them to be worth considering, though none replace medication for people with significantly elevated blood sugar.
Berberine is the most studied. It’s a plant compound that works partly by reducing the amount of glucose your liver releases and partly by improving how your cells respond to insulin. A large meta-analysis found berberine lowered fasting blood sugar by an average of about 8 mg/dL. That’s a modest but real effect. The optimal dose appears to be around 1 to 1.5 grams per day, typically split into two or three doses taken with meals. Berberine can interact with several medications, so it’s worth checking with a pharmacist if you take other drugs.
Chromium picolinate has a more mixed track record. Some early trials in people with type 2 diabetes tested doses of 200 to 1,000 micrograms daily, and a few showed improvements in blood sugar markers. But a well-designed 24-week trial using 1,000 micrograms daily found no significant effect on fasting glucose, insulin sensitivity, or HbA1c compared to placebo. The evidence here is inconsistent enough that you shouldn’t expect dramatic results.
Magnesium is worth mentioning because many people with high blood sugar are deficient in it, and low magnesium levels are independently linked to worse insulin resistance. Correcting a deficiency through food (nuts, seeds, leafy greens, dark chocolate) or supplementation can improve how well your body handles glucose.
Prescription Medications
When lifestyle changes and supplements aren’t enough, medications become necessary. Several classes of drugs lower blood sugar through different mechanisms, and your doctor will choose based on your specific situation.
Metformin is the most commonly prescribed first-line medication for type 2 diabetes. It works in two ways: it reduces the amount of glucose your liver produces, and it makes your muscle tissue more sensitive to insulin so your cells can absorb glucose more effectively. It’s inexpensive, well-studied over decades, and generally well-tolerated, though digestive side effects like nausea or diarrhea are common early on.
SGLT2 inhibitors take a completely different approach. They work in the kidneys, blocking a protein that normally reabsorbs glucose back into your bloodstream. The result is that excess glucose leaves your body through urine. Beyond blood sugar control, people taking these medications often see modest weight loss and small reductions in blood pressure.
GLP-1 receptor agonists mimic a natural gut hormone that stimulates insulin release after meals, slows digestion, and reduces appetite. These injectable medications have become increasingly popular because of their effectiveness for both blood sugar and weight management. Newer dual-acting medications that target two gut hormones at once have shown even greater results. In a comparative study, one dual-acting medication improved HbA1c by 0.67% on average, compared to 0.40% for a single-acting version.
What to Do When Blood Sugar Is Very High
If your blood sugar reads 240 mg/dL or above, the situation requires more than diet or exercise. At that level, your body may start breaking down fat for energy in a way that produces dangerous acids in your blood, a condition called diabetic ketoacidosis. You should test your urine for ketones using an over-the-counter test kit. A positive result means your body is already heading in a dangerous direction, and you need medical attention promptly.
Exercise, which is usually beneficial, can actually raise blood sugar further when levels are already very high and ketones are present. At those levels, focus on hydration, take any prescribed insulin or medication, and monitor closely.
Combining Approaches for the Best Results
No single intervention works as well as a combination. Someone who starts walking after dinner, adds more fiber to their meals, and takes their prescribed metformin will see significantly better results than someone relying on just one of those strategies. The lifestyle changes (exercise, dietary fiber, meal composition) address the root of insulin resistance, while medications and targeted supplements provide additional support.
Tracking your numbers with a glucometer helps you see what actually works for your body. Blood sugar responses are surprisingly individual. Some people spike after white rice but handle bread fine, or find that morning walks lower their numbers more than evening ones. Testing before and two hours after meals gives you a personal feedback loop that no general advice can replace.