The fastest way to bring your blood sugar up is to eat or drink 15 grams of fast-acting carbohydrates, such as 4 ounces of fruit juice, 3 to 4 glucose tablets, or a tablespoon of honey. This approach, known as the 15-15 rule, is the standard method recommended by major health organizations. Most people feel noticeably better within 10 to 15 minutes.
Recognizing Low Blood Sugar
Blood sugar below 70 mg/dL is considered low. Below 54 mg/dL is classified as severely low and requires more aggressive treatment. Your body sends warning signals in a predictable order: the earliest symptoms come from your nervous system revving up in response to dropping glucose. These include sweating, shaking, a racing heartbeat, anxiety, and sudden intense hunger.
If blood sugar continues to fall, the brain itself starts running short on fuel. That’s when you may notice confusion, difficulty concentrating, irritability, or trouble speaking clearly. In extreme cases, this can progress to seizures or loss of consciousness. The early warning signs almost always come first, giving you a window to act before things get dangerous.
The 15-15 Rule, Step by Step
For blood sugar at or below 70 mg/dL, follow these steps:
- Step 1: Eat or drink 15 grams of fast-acting carbohydrates.
- Step 2: Wait 15 minutes, then recheck your blood sugar.
- Step 3: If it’s still below 70, repeat steps 1 and 2.
If your blood sugar is at or below 54 mg/dL, double the dose to 30 grams of fast-acting carbs, then follow the same 15-minute recheck cycle. The key word here is “fast.” You want simple sugars that hit your bloodstream quickly, not complex carbs or foods wrapped in fat and protein that slow digestion.
Best Foods for a Quick Blood Sugar Boost
Any of the following provides roughly 15 grams of fast-acting carbohydrates:
- 3 to 4 glucose tablets
- 1 tube of glucose gel
- 4 ounces (half a cup) of fruit juice or regular soda (not diet)
- 1 tablespoon of honey, sugar, jam, or corn syrup
- Hard candies, jellybeans, or gumdrops (check the label for the right amount)
- 8 ounces of skim or low-fat milk
Glucose tablets and gel are the most precise options because they contain a measured dose and absorb quickly. Juice and regular soda are the most practical when you don’t have glucose products on hand. If your blood sugar is below 54, simply double these portions to get 30 grams.
What Not to Eat During a Low
Chocolate, peanut butter, nuts, and other high-fat foods are poor choices for treating a low. Fat slows carbohydrate absorption, which means your blood sugar won’t rise fast enough when you need it most. Save those foods for after your levels have stabilized. The same applies to protein-heavy options like meat or cheese on their own. During an active low, pure and simple carbs work best.
Once your blood sugar is back above 70 and you’ve confirmed it with a recheck, eating a small meal or snack that includes both carbohydrates and protein helps keep it stable. A half sandwich, crackers with cheese, or yogurt with granola are all solid choices for this follow-up.
Handling Lows During Sleep
Low blood sugar that happens overnight is particularly tricky because you may sleep through the early warning signs. Waking up drenched in sweat, with a headache, or feeling unusually groggy can all point to blood sugar that dropped while you were asleep.
If nighttime lows are a recurring problem, a bedtime snack that pairs carbohydrates with protein can help maintain steadier levels through the night. Good options include yogurt with granola, whole-grain crackers with cheese, or half a sandwich with lean protein. The carbohydrates provide an initial bump while the protein digests more slowly, offering sustained support over several hours. Keeping a log of nighttime and morning blood sugar readings helps you and your provider spot patterns and adjust your approach.
When Someone Can’t Treat Themselves
Severe hypoglycemia can make a person confused, unresponsive, or unconscious. If someone is unable to eat or drink safely, do not try to put food in their mouth, as it poses a choking risk. This is when emergency glucagon becomes essential.
Glucagon is a hormone that signals the liver to release stored glucose into the bloodstream. It’s available in two forms: a nasal spray and an injectable kit. The nasal version is sprayed into one nostril and doesn’t require the person to inhale. The injectable form is given into the muscle or under the skin. Both are equally effective at raising blood sugar. The nasal spray tends to cause minor nose and eye irritation, while the injection is more likely to cause nausea. If you take insulin or medications that can cause lows, having a glucagon kit at home and making sure the people around you know how to use it is a practical safety measure.
If glucagon isn’t available, or if the person doesn’t respond within about 15 minutes of receiving it, call emergency services.
Staying Prepared
Lows can happen at inconvenient times: while driving, exercising, or in the middle of a meeting. Keeping glucose tablets or a small juice box in your bag, car, desk, and nightstand means you’re never caught without a way to treat one. A few practical habits make a real difference:
- Carry at least 15 to 30 grams of fast-acting carbs with you at all times.
- Wear a medical ID bracelet or keep medical information on your phone’s lock screen.
- Check your blood sugar before driving, especially if you use insulin.
- Let close friends, family, or coworkers know the signs of a low and where you keep your supplies.
The 15-minute wait after treating a low can feel agonizing when you’re shaky and sweating. Resist the urge to keep eating. Overtreating often leads to a blood sugar spike in the opposite direction, which creates its own problems. Trust the 15-15 process, recheck, and only repeat if your numbers are still below 70.