The fastest way to raise low blood sugar is to eat or drink 15 grams of fast-acting carbohydrates, wait 15 minutes, and recheck. Blood sugar below 70 mg/dL is considered low, and anything below 54 mg/dL is severely low and potentially dangerous. Whether you’re managing diabetes or experiencing an unexpected drop, knowing exactly what to eat and how quickly to act makes a real difference.
Recognizing Low Blood Sugar
Your body sends two waves of warning signals when blood sugar drops. The first wave is physical: sweating, shaking, a rapid heartbeat, sudden hunger, and a surge of anxiety. These happen because your body releases stress hormones trying to push glucose back into your bloodstream.
If blood sugar keeps falling, a second wave hits. This one involves your brain, which depends heavily on glucose for fuel. You may notice a headache, dizziness, blurred vision, difficulty concentrating, or poor coordination. At more dangerous levels, symptoms escalate to confusion, slurred speech, tingling in the lips or hands, fainting, or seizures. Acting during the first wave of symptoms prevents things from reaching that point.
The 15-15 Rule for a Quick Fix
The standard approach recommended by the CDC and the American Diabetes Association is called the 15-15 rule. Eat or drink 15 grams of fast-acting carbohydrates, then wait 15 minutes and check your blood sugar again. If it’s still below 70 mg/dL, repeat the process. Keep going until your levels return to your target range.
The key word here is “fast-acting.” You want simple sugars that hit your bloodstream quickly, not foods with fiber, fat, or protein that slow digestion. Good options that deliver roughly 15 grams of carbohydrates include:
- Glucose tablets: 3 to 4 tablets (check your brand’s label)
- Fruit juice: ½ cup of unsweetened juice
- Regular soda: ½ cup (not diet)
- Honey: 1 tablespoon
- Hard candies: a small handful, such as 5 to 6 Lifesavers
Glucose tablets are the most precise option because they’re pre-measured and absorb quickly. Juice and regular soda work well too. Avoid chocolate, cookies, or ice cream in the moment. Their fat content slows sugar absorption, which is the opposite of what you need when your blood sugar is actively dropping. For young children, especially infants and toddlers, less than 15 grams is typically appropriate. A pediatrician can provide the right amount for a child’s size.
Preventing a Second Drop
Fast-acting carbs raise your blood sugar quickly, but the effect can be short-lived. Once your levels are back above 70 mg/dL, follow up with a balanced snack or meal that pairs carbohydrates with protein. The protein slows digestion and helps keep your blood sugar stable over the next few hours, preventing another dip.
Some practical pairings that combine about 15 grams of carbohydrates with a protein source:
- Peanut butter and crackers: 2 tablespoons of peanut butter with 6 crackers
- Cheese and applesauce: 1 string cheese with ½ cup of applesauce
- Egg and toast: 1 scrambled egg with 1 slice of toast
- Beans and rice: ½ cup of beans with ⅓ cup of rice
If your next full meal is more than an hour away, this follow-up snack is especially important. Skipping it is one of the most common reasons people experience a second episode shortly after treating the first one.
When Someone Can’t Eat or Drink
If blood sugar drops below 54 mg/dL and the person is confused, unconscious, or unable to swallow safely, do not try to put food or liquid in their mouth. This is a medical emergency. Glucagon, a hormone that signals the liver to release stored glucose, is the appropriate treatment in this situation.
Glucagon is available by prescription in two forms: an injectable kit and a nasal spray. The nasal version is sprayed into one nostril and doesn’t require any mixing or needle preparation. Studies show the nasal spray works just as effectively as the injected version for reversing low blood sugar in both adults and children with type 1 diabetes. Side effects are similar between the two, though the injection tends to cause more nausea and vomiting while the nasal spray may cause mild eye or nose irritation.
If you take insulin or a medication that can cause low blood sugar, having a glucagon kit at home and making sure someone close to you knows how to use it is a practical safety measure.
Why Blood Sugar Drops in the First Place
For people with diabetes, the most common triggers are taking too much insulin, delaying or skipping a meal, exercising more intensely than usual, or drinking alcohol without eating. Any of these can create a mismatch between the amount of glucose in your blood and the amount of insulin working to clear it.
People without diabetes can also experience low blood sugar. Reactive hypoglycemia causes a drop within four hours after eating, often triggered by meals high in refined carbohydrates that cause a spike followed by an overcorrection. The exact mechanism isn’t always clear, but it tends to follow predictable patterns tied to what and when you eat. Other causes include alcohol consumption on an empty stomach, prior gastric bypass surgery, rare inherited metabolic conditions, and certain types of tumors.
Staying Ahead of Future Episodes
If low blood sugar happens to you regularly, the pattern itself is worth paying attention to. Keeping a log of when episodes occur, what you ate beforehand, and your activity level can reveal triggers you can adjust. For people on insulin, this information helps with dosing decisions over time.
Eating balanced meals at regular intervals is the most effective prevention strategy for both diabetic and non-diabetic hypoglycemia. Meals that include protein, healthy fat, and complex carbohydrates release glucose gradually rather than in a spike-and-crash pattern. Spreading your carbohydrate intake across the day rather than loading it into one or two meals helps keep levels more stable.
Carrying a portable source of fast-acting carbohydrates, like glucose tablets or a small juice box, means you’re never caught without a quick fix. If you exercise regularly, checking your blood sugar before and after workouts and having a carbohydrate-rich snack on hand can prevent exercise-related drops before they start.