The fastest way to fix hypoglycemia is to eat or drink 15 grams of fast-acting carbohydrates, wait 15 minutes, and recheck your blood sugar. This approach, known as the 15-15 rule, is the standard method recommended by the CDC and most diabetes organizations. If your blood sugar is still below 70 mg/dL after 15 minutes, you repeat the process until it’s back in your target range.
Recognizing a Low Before You Treat It
Your body sends two waves of warning signals as blood sugar drops. The first wave is physical: shaking, sweating, a pounding heartbeat, and sudden intense hunger. These are your body’s stress hormones kicking in to signal that fuel is running low.
If blood sugar keeps falling, a second set of symptoms appears as your brain starts running short on glucose. These include confusion, drowsiness, slurred speech, and unusual behavior. Nausea and headache can show up at any point. The distinction matters because once you’re in that second wave, your ability to help yourself drops significantly. Someone nearby may need to step in.
The 15-15 Rule Step by Step
If you can check your blood sugar and it reads below 70 mg/dL, or you’re feeling the symptoms listed above and can’t test, start here:
- Step 1: Eat or drink something with 15 grams of fast-acting carbohydrates.
- Step 2: Wait 15 minutes. This feels long when you’re shaky and hungry, but it takes that long for glucose to reach your bloodstream.
- Step 3: Recheck your blood sugar. If it’s still under 70 mg/dL, eat another 15 grams and wait another 15 minutes.
- Step 4: Keep repeating until your blood sugar is back in your target range.
What Counts as 15 Grams of Fast Carbs
You want pure, simple sugar that hits your bloodstream quickly. Fat and fiber slow absorption, so a candy bar or a bowl of oatmeal won’t work as well as you’d think. The best options are:
- Glucose tablets: 3 to 4 tablets, depending on the brand. These are the gold standard because each one is precisely dosed.
- Fruit juice: About 4 ounces (half a cup) of orange or apple juice.
- Regular soda: About 4 ounces of non-diet soda.
- Jelly beans: Roughly 10 pieces.
- Hard candy: 4 to 5 pieces of something like Lifesavers.
- Honey or sugar: 1 tablespoon.
Avoid chocolate, cookies, ice cream, or anything with significant fat content for this first step. Fat delays how quickly glucose enters your blood, and speed is the whole point.
Why Eating Too Much Makes Things Worse
When your blood sugar crashes, your body screams at you to eat everything in sight. The shaking, the hunger, the brain fog all drive intense cravings for carbohydrate-rich food. This is a real physiological response, not a lack of willpower, and it leads many people to eat far more than 15 grams.
The problem is that excess carbohydrate intake during a low causes what’s called rebound hyperglycemia, where blood sugar spikes well above your target range. For people on insulin, that spike often triggers a large corrective dose given out of frustration (sometimes called a “rage bolus”), which can send blood sugar crashing again. The result is a rollercoaster of highs and lows that can be more dangerous than a single episode of sustained high blood sugar. Sticking to 15 grams at a time, even when every instinct says to eat more, is the single most important part of treating a low safely.
The Follow-Up Snack That Keeps You Stable
Getting your blood sugar back above 70 mg/dL is only half the job. Simple sugar burns fast, and without a follow-up, you can drop right back down. Once your reading is back in range, eat a balanced snack or meal within 15 to 30 minutes.
The goal is to combine carbohydrates with protein and a bit of fat. Peanut butter on whole-grain crackers, cheese and an apple, or a handful of nuts with a piece of fruit all work well. The protein and fat slow the digestion of carbohydrates, creating a steadier release of glucose over the next few hours instead of another sharp spike and drop. If a low happens close to bedtime, this follow-up snack is especially important. An evening snack with carbohydrate, protein, fat, and fiber helps prevent overnight lows while you sleep.
What to Do When Someone Can’t Eat or Drink
If a person with low blood sugar is unconscious, seizing, or too confused to swallow safely, do not put food or liquid in their mouth. This is a severe hypoglycemia emergency, and it requires glucagon.
Glucagon is a hormone that signals the liver to release stored glucose into the bloodstream. It’s available in three forms. A nasal spray delivers powdered glucagon through the nose in one step, with no needles involved. It works even on an unconscious person and is the easiest option for someone without medical training to use. A pre-mixed pen works like an EpiPen: remove the cap, press it against the outer thigh, upper arm, or lower stomach, and inject. The third option is a traditional kit where you mix a powder with liquid before injecting, which is more complex under pressure.
After giving glucagon to someone who is unconscious, turn them on their side. Nausea and vomiting are common side effects, and lying on their back creates a choking risk. If the person hasn’t woken up within 15 minutes, give a second dose if one is available and call emergency services if you haven’t already.
Keeping a Rescue Kit Ready
If you take insulin or a medication that can cause lows, preparation is what separates a brief inconvenience from an emergency. Keep fast-acting glucose in every place you spend time: your bag, your car, your desk, your nightstand. Glucose tablets are ideal because they don’t melt, don’t expire quickly, and have a precise carbohydrate count printed on the package.
If you’ve ever had a severe low or you live alone, keep a glucagon device where someone else can find it and make sure at least one person in your household or workplace knows how to use it. Each glucagon device is single-use, so replace it after it’s been used and check the expiration date every few months. A blood glucose meter (or a continuous glucose monitor) completes the kit, letting you confirm a low rather than guessing and helping you track whether your treatment is actually working.