The fastest way to raise low blood sugar is to eat or drink 15 grams of fast-acting carbohydrates, then wait 15 minutes and recheck. Blood sugar below 70 mg/dL is considered low, and below 54 mg/dL is severe. If you or someone near you is showing symptoms right now, grab glucose tablets, fruit juice, or regular soda and consume 15 grams of simple sugar as quickly as possible.
The 15-15 Rule
The standard approach to treating low blood sugar is called the 15-15 rule: eat 15 grams of carbohydrates, wait 15 minutes, then check your blood sugar again. If it’s still under 70 mg/dL, repeat the process. This method works because 15 grams is enough to raise your levels meaningfully without overshooting into high blood sugar territory.
Glucose tablets are the gold standard because each tablet contains a precise amount of sugar (usually 4 grams), making it easy to hit exactly 15 grams. Pure glucose is absorbed faster than any other sugar because your body doesn’t need to break it down first. The American Diabetes Association’s 2026 guidelines specifically list glucose as the preferred treatment.
If you use an automated insulin delivery system (an insulin pump that adjusts doses on its own), 5 to 10 grams of carbohydrates is often enough unless the low happened during exercise or after a large meal bolus.
Best Foods for a Fast Response
Not all sugary foods work equally well. Simple carbohydrates raise blood sugar quickly because they require almost no digestion. Complex carbohydrates, which contain fiber and longer starch chains, take much longer to break down and won’t help in an urgent situation. Here are reliable options that deliver roughly 15 grams of fast-acting carbs:
- Glucose tablets: 3 to 4 tablets depending on the brand. The fastest, most predictable option.
- Fruit juice: About 4 ounces (half a cup) of orange or apple juice.
- Regular soda: About 4 ounces. Must be regular, not diet.
- Hard candies: A small handful, typically 4 to 5 pieces. Check the label for sugar content.
- Honey or table sugar: About 1 tablespoon dissolved in water or taken straight.
One important exception: if you take a medication called acarbose (which blocks the breakdown of table sugar in your gut), you need to use pure glucose tablets or gel. Regular sugar, juice, or soda won’t be broken down efficiently because of how the medication works, and your blood sugar correction will be delayed.
Foods That Won’t Work Fast Enough
This is where many people make a costly mistake. When blood sugar drops, the instinct is to reach for whatever sweet thing is nearby. But chocolate, candy bars, ice cream, cookies, and even high-fat milk are poor choices for immediate treatment. Fat slows digestion significantly. The sugar in a chocolate bar gets trapped behind a wall of fat and protein, delaying absorption into your bloodstream right when you need it most.
Protein-heavy foods are similarly unhelpful. Protein can actually stimulate insulin release, which is the opposite of what you need when your blood sugar is already too low. Crackers and bread also take longer to digest than simple sugar sources. Save these foods for the stabilization step that comes after you’ve brought your levels back up.
Recognizing Low Blood Sugar
Your body produces two distinct waves of symptoms as blood sugar drops. The first wave comes from your nervous system sounding the alarm: sweating, shakiness, a racing heart, anxiety, and sudden intense hunger. These are your early warning signs, and they’re the easiest window to treat.
If blood sugar continues to fall, a second set of symptoms appears as your brain starts running short on fuel. These include weakness, dizziness, difficulty concentrating, confusion, blurred vision, and behavior changes that can look like intoxication to bystanders. Some people become unusually irritable or uncoordinated without realizing anything is wrong. At severe levels (below 54 mg/dL), loss of consciousness and seizures become possible.
Not everyone experiences the early warning symptoms, especially people who have had diabetes for many years or who experience frequent lows. This condition, sometimes called hypoglycemia unawareness, makes regular blood sugar monitoring especially important.
What to Do After Your Levels Come Back Up
Once your blood sugar rises above 70 mg/dL, you’re not done. The fast-acting sugar you consumed will burn through quickly, and without a follow-up, your levels can drop right back down. Eat a small meal or snack that combines complex carbohydrates with some protein. A peanut butter sandwich, cheese and crackers, or a handful of nuts with a piece of fruit all work well. This combination gives you a slow, sustained release of glucose that prevents a second crash.
If your next regular meal is more than an hour away, this follow-up snack is especially important. The 15 grams of simple sugar you used for the initial rescue only provides a temporary bridge.
When Someone Can’t Eat or Drink
If a person with low blood sugar is unconscious, seizing, or too confused to safely swallow, do not try to put food or liquid in their mouth. This is a choking risk. The treatment for severe hypoglycemia is glucagon, a hormone that signals the liver to release stored sugar into the bloodstream.
Glucagon comes in two forms that anyone can administer without medical training. A nasal spray version works like a nasal decongestant: you insert the nozzle into one nostril and press the plunger. A ready-to-inject version comes in a pre-filled device similar to an epinephrine auto-injector. Both are preferred over older glucagon kits that required mixing powder with liquid before injecting, a process that was stressful and error-prone during an emergency.
Anyone who takes insulin should have a glucagon prescription, and the people around them, whether family members, coworkers, or school staff, should know where it’s kept and how to use it. Call emergency services if glucagon isn’t available or the person doesn’t respond within 10 to 15 minutes.
Preventing Repeated Lows
If you find yourself treating low blood sugar frequently, the pattern itself is worth addressing. Common triggers include skipping meals, exercising more intensely than usual, taking too much insulin, or drinking alcohol without eating. Alcohol is particularly deceptive because it blocks the liver’s ability to release stored glucose, meaning a low can hit hours after your last drink.
Keeping fast-acting carbohydrates within easy reach at all times reduces the risk of a mild low turning into a dangerous one. Glucose tablets in your car, your desk drawer, your nightstand, and your gym bag give you a safety net wherever symptoms strike. First aid kits at home and work should include oral glucose for this reason.