When your blood sugar drops below 70 mg/dL, the fastest treatment is to eat 15 grams of pure, fast-acting carbohydrate, such as 4 glucose tablets, 4 ounces of fruit juice, 1 tablespoon of honey, or half a can of regular soda. Wait 15 minutes, retest, and repeat if still low. This is called the 15-15 rule, and it is the standard treatment recommended by the American Diabetes Association.
The 15-15 Rule: How to Treat Low Blood Sugar
The 15-15 rule is the cornerstone of hypoglycemia self-care. The steps are simple, but doing them in order matters because over-treating can swing your glucose too high and leave you feeling sick for hours.
- Check your blood sugar. Confirm it is below 70 mg/dL with a meter or continuous glucose monitor. If you cannot check but feel symptoms, treat anyway.
- Eat 15 grams of fast-acting carbohydrate. Use one of the options listed below.
- Wait 15 minutes. Sit down. Do not eat more during this window even if you still feel shaky.
- Recheck your blood sugar. If still under 70 mg/dL, eat another 15 grams. If above 70 mg/dL, you are out of the danger zone.
- Eat a small balanced snack or meal. If your next meal is more than an hour away, have a snack with carbohydrate plus protein to prevent a rebound low.
Children typically need 10 to 15 grams of carbohydrate, and infants need around 6 grams. Always confirm pediatric dosing with your child’s healthcare team.
Best Fast-Acting Carbohydrates for Low Blood Sugar
Pure simple sugars work fastest because they need almost no digestion before entering the bloodstream. Foods with fat, fiber, or protein digest more slowly, which is the opposite of what you want during a hypoglycemic episode.
| Food or Drink | Serving for 15 g of Carbs | Speed of Action |
|---|---|---|
| Glucose tablets | 3 to 4 tablets (check label) | Fastest, most predictable |
| Glucose gel | 1 tube (15 g) | Very fast |
| Fruit juice (orange, apple, grape) | 4 oz (1/2 cup) | Very fast |
| Regular soda (not diet) | 4 to 6 oz | Very fast |
| Honey or table sugar | 1 tablespoon | Very fast |
| Hard candy (e.g., Lifesavers) | 3 to 5 pieces | Fast |
| Jelly beans | about 15 small | Fast |
| Skim milk | 8 oz (1 cup) | Moderate (fat in whole milk slows it) |
| Raisins | 2 tablespoons | Fast |
Why Glucose Tablets Are the Gold Standard
Glucose tablets are the preferred treatment for several reasons: each tablet contains a known amount of pure dextrose (usually 4 grams), they have a long shelf life, they do not contain fat or fiber, and they are easy to carry in a purse, glove box, or gym bag. They are also less tempting to over-consume than juice or candy, which reduces the risk of post-treatment hyperglycemia.
What NOT to Eat When Blood Sugar Is Low
Many people instinctively reach for chocolate, peanut butter, or ice cream during a low. These are poor choices because the fat content slows the rise in blood sugar by delaying gastric emptying. The result is a longer episode and more discomfort.
- Chocolate bars and chocolate candy — fat coats the gut and slows absorption.
- Ice cream — high fat, plus the cold temperature can further slow digestion.
- Peanut butter or nuts — almost no usable carb and lots of fat.
- Whole-grain bread, oatmeal, or other complex carbs — too slow for an emergency.
- Diet soda or sugar-free candy — no carbohydrate at all.
- Protein bars — too much fat and protein, often very low net carb.
Save these foods for the small follow-up snack after your blood sugar has recovered.
Recognizing Low Blood Sugar Symptoms
Hypoglycemia comes on quickly. Common early warning signs include shakiness, sweating, a fast heartbeat, hunger, irritability, dizziness, and trouble concentrating. As glucose drops further, you may experience blurry vision, confusion, slurred speech, weakness, or numbness around the mouth. Learn more about the full list of symptoms of prediabetes and blood sugar problems so you can act early.
Some people develop hypoglycemia unawareness, especially after years of diabetes, meaning they no longer feel early symptoms. A continuous glucose monitor with low alerts is particularly valuable for these patients.
Severe Hypoglycemia: When the 15-15 Rule Is Not Enough
Severe hypoglycemia is defined as a low that you cannot treat yourself, usually because of confusion, combativeness, seizure, or loss of consciousness. In these cases, oral food and drink are dangerous because the person may aspirate.
Glucagon Options
- Injectable glucagon kits (e.g., Lilly GlucaGen Hypokit) — must be reconstituted before injection. Trained family members can give it intramuscularly in the thigh, arm, or buttock.
- Gvoke HypoPen and Zegalogue — pre-filled, ready-to-use glucagon auto-injectors. No mixing required.
- Baqsimi nasal glucagon — a 3-mg single-use nasal powder. No injection, no inhalation needed; the powder is absorbed through the nasal lining. It works even if the person is not breathing in.
After giving glucagon, turn the person on their side (recovery position) because vomiting is common, and call 911. Once they regain consciousness and can swallow safely, give them a snack with carbs and protein to keep glucose from dropping again.
Preventing Future Low Blood Sugar Episodes
Treating a low is only half the battle. Identifying why it happened helps you prevent the next one. Common causes include skipping meals, exercising more than usual, drinking alcohol on an empty stomach, taking too much insulin or sulfonylurea medication, or unintentional weight loss that lowers your insulin requirements.
If you have prediabetes or are taking metformin for prediabetes, true hypoglycemia is uncommon — metformin alone rarely causes lows. But reactive hypoglycemia after high-carb meals can still happen. A balanced eating pattern, like the one outlined in our prediabetes diet guide, helps stabilize glucose.
Building a Hypoglycemia Kit
Keep a small kit in every place you spend time: at home, at work, in your car, and in your bag. A basic kit should contain:
- 2 tubes of glucose tablets (or glucose gel)
- One non-perishable juice box
- A glucagon device (Baqsimi or auto-injector) if prescribed
- Instructions for friends or family
- A medical ID bracelet or wallet card
The Bottom Line
When blood sugar drops below 70 mg/dL, treat with 15 grams of fast-acting carbohydrate, wait 15 minutes, and retest. Glucose tablets are the most reliable choice, while juice, regular soda, honey, and hard candy work well in a pinch. Avoid chocolate and other fatty foods, which delay recovery. For severe lows with confusion or unconsciousness, use glucagon and call 911. Always discuss recurring low blood sugar with your healthcare provider so you can adjust medications, meal timing, or activity levels to prevent future episodes.
