When your blood sugar drops below 70 mg/dL, you need fast-acting sugar immediately. The goal is to get 15 grams of simple carbohydrates into your body as quickly as possible, then recheck after 15 minutes. This approach, called the 15-15 rule, is the standard method for bringing low blood sugar back to a safe range. What you choose to eat matters: some foods work in minutes, while others take far too long when every minute counts.
Recognizing a Low Before You Eat
Your body sends clear warning signals when blood sugar drops. The earliest signs are shaking, sweating, a pounding heart, dizziness, and sudden intense hunger. You may also feel anxious, irritable, or have trouble concentrating. Some people notice tingling in their lips or cheeks, or see their skin go pale.
If blood sugar keeps falling below 54 mg/dL, symptoms become more serious: blurred or double vision, slurred speech, confusion, loss of coordination, and in the worst cases, seizures or loss of consciousness. At that point, eating is no longer a safe option, and the person needs emergency help (more on that below). The key is to act on the early symptoms before things escalate.
Low blood sugar can also happen during sleep. Signs include restless sleep, sweating through your sheets, nightmares, or waking up feeling confused and exhausted.
The 15-15 Rule
As soon as you feel symptoms or confirm a reading below 70 mg/dL, eat or drink 15 grams of fast-acting carbohydrates. Wait 15 minutes, then check your blood sugar again. If it’s still under 70, repeat with another 15 grams. Keep cycling through these steps until your level is back in your target range.
The simplicity here is the point. You don’t need a meal. You need a precise, small amount of sugar that your body can absorb almost immediately.
Best Fast-Acting Foods for a Low
Not all sugary foods are equal when you’re treating a low. You want pure, simple carbohydrates with little or no fat, fiber, or protein slowing things down. Each of these provides roughly 15 grams of fast-acting carbohydrate:
- Glucose tablets: 4 to 5 tablets. These are the preferred option because the dose is precise and absorption is predictable.
- Fruit juice or regular soda (not diet): about two-thirds of a cup (150 mL).
- Hard candy like Life Savers: 6 pieces.
- Honey: 1 tablespoon.
- Table sugar: 1 tablespoon or 3 sugar packets dissolved in water.
Glucose tablets are worth keeping in your bag, nightstand, and car. They’re cheap, shelf-stable, and remove the guesswork. Juice boxes are another convenient option because they come in pre-measured portions.
What Not to Eat During a Low
Your instinct during a low might be to grab whatever food is closest, but some common choices actually work against you. Chocolate, peanut butter, ice cream, and other foods high in fat or protein slow down how quickly sugar reaches your bloodstream. Fat delays stomach emptying, which means the carbohydrates in a chocolate bar take significantly longer to raise your glucose than the same amount of sugar from juice or glucose tablets.
Protein creates its own complications. It triggers hormonal responses that can actually lower blood glucose further rather than raise it. A handful of nuts or a cheese stick might be a great snack under normal circumstances, but during an active low, they won’t help fast enough.
Diet soda, sugar-free candy, and artificially sweetened drinks contain no sugar at all and will do nothing for a low. Always check labels if you’re grabbing something in a hurry.
What to Eat After Your Sugar Stabilizes
Once your blood sugar is back above 70 mg/dL, you’re not done. Without a follow-up snack, there’s a real chance your levels will drop again, especially if your next meal is more than an hour away. The goal now shifts from speed to staying power: you want a combination of about 15 grams of complex carbohydrates paired with some protein.
Good follow-up snack options include:
- Half a sandwich with meat, cheese, or peanut butter
- Crackers with cheese: about 55 Goldfish crackers with 1 ounce of cheese
- Apple or small fruit with cheese
- Rice cakes with peanut butter: 2 rice cakes with 2 tablespoons of peanut butter
- Tortilla chips with beans: 15 to 20 baked chips with 2 tablespoons of refried beans
- Crackers with tuna: 6 saltine crackers with a quarter cup of tuna salad
The protein and complex carbs digest more slowly, providing a steady supply of glucose over the next couple of hours instead of another sharp spike and drop.
Treating Low Blood Sugar in Children
Children need less sugar to correct a low. The general guideline is about 0.3 grams of carbohydrate per kilogram of body weight. In practical terms, a child who weighs around 30 kg (66 pounds) needs roughly 9 grams of fast-acting carbs, while a child around 50 kg (110 pounds) needs the full 15-gram adult dose. For a smaller child, that might mean 3 glucose tablets or half a cup of juice instead of the full portions listed above.
A pediatric study found that 0.3 grams per kilogram of rapidly acting carbohydrate raised blood sugar by about 36 to 38 mg/dL within 15 minutes in most children, without causing a rebound spike before their next meal. Overshooting with too much sugar is a common mistake with kids, so measuring matters.
When Food Isn’t Enough
If someone’s blood sugar has dropped so low that they’re confused, unresponsive, or unconscious, they cannot safely eat or drink. Trying to put food in the mouth of someone who can’t swallow properly creates a choking risk. This is when glucagon, an emergency hormone that forces the liver to release stored sugar, becomes necessary. Glucagon comes as an injection or a nasal spray that can be given by someone nearby, even to an unconscious person.
If you or someone you live with is at risk for severe lows, keep a glucagon kit accessible and make sure household members know where it is and how to use it. If glucagon isn’t available and the person is unconscious, call emergency services immediately. Turn the person on their side to prevent choking.
Preventing Repeat Lows
If you’re experiencing frequent lows, the pattern itself is worth paying attention to. Track when your lows happen: before meals, after exercise, in the middle of the night. That timing often reveals the trigger, whether it’s a medication dose that needs adjusting, a skipped snack, or physical activity you didn’t fuel for.
Keeping fast-acting carbs within arm’s reach at all times is the single most practical thing you can do. Glucose tablets in your desk drawer, a juice box in your gym bag, honey packets in your car. The worst time to figure out what to eat is when your hands are shaking and your thinking is foggy. Having a plan, and the right foods already there, makes a low blood sugar episode manageable instead of dangerous.