When a diabetic person’s blood sugar drops below 70 mg/dL, give them 15 grams of fast-acting carbohydrates immediately. This means something sugary with no fat or protein, because fat slows down how quickly sugar reaches the bloodstream. The goal is to raise blood sugar quickly, then recheck it after 15 minutes and repeat if needed.
Best Fast-Acting Options
Not all sugary foods work equally well. You want something the body can convert to glucose almost immediately. Any of these provides roughly 15 grams of carbohydrates:
- Glucose tablets: 3 tablets (the fastest, most reliable option)
- Fruit juice: half a cup (4 ounces) of orange juice or apple juice
- Regular soda: half a cup (4 ounces), not diet
- Hard candies: 6 or 7 pieces
- Sugar: 1 tablespoon dissolved in water or placed under the tongue
Glucose tablets are the gold standard because they contain a precise dose and absorb faster than food. If you’re caring for someone with diabetes, keeping a tube of glucose tablets in the house, car, and bag is worth the small investment. Juice boxes are another good option because they come in pre-measured portions and don’t expire quickly.
Avoid chocolate, cookies, peanut butter, ice cream, or anything with fat or protein during the initial treatment. These foods feel like an obvious choice because they’re sweet, but the fat content dramatically slows digestion. The sugar takes much longer to hit the bloodstream, which is the opposite of what you need in that moment.
The 15-15 Rule Step by Step
The standard approach recommended by the CDC is called the 15-15 rule. Give 15 grams of fast-acting carbs, then wait 15 minutes. After 15 minutes, check blood sugar again. If it’s still below 70 mg/dL, give another 15 grams and wait another 15 minutes. Keep repeating this cycle until blood sugar returns to the target range.
It’s tempting to overdo it, especially if the person feels terrible. But flooding the body with sugar can cause blood sugar to spike too high afterward, which creates its own problems. Sticking to 15 grams at a time keeps the recovery controlled.
What to Eat After Blood Sugar Recovers
Once blood sugar is back above 70 mg/dL, the job isn’t done. Fast-acting carbs raise blood sugar quickly, but they also burn off quickly. Without a follow-up snack or meal, blood sugar can drop right back down again.
This is where fat and protein become helpful instead of harmful. A small snack that combines complex carbohydrates with protein and healthy fat slows digestion and keeps blood sugar stable for longer. Nuts are an ideal choice because they contain all three. A handful of crackers with cheese, half a sandwich, or a small bowl of oatmeal with peanut butter all work well. If a regular meal is coming within the next 30 minutes, that meal can serve as the follow-up instead.
Eating small meals or snacks every two to four hours also helps prevent repeat lows, particularly on days when blood sugar has already been unstable.
How to Tell Blood Sugar Is Low
A blood sugar reading below 70 mg/dL confirms hypoglycemia, but you may need to act before a meter is available. Common early warning signs include shaking or trembling, sweating, a racing heart, irritability, and sudden hunger. These symptoms typically appear when blood sugar falls into the 50 to 60 mg/dL range.
Some people with long-standing diabetes develop a condition called hypoglycemia unawareness, where the body stops producing these early warning signals. They may feel completely fine until blood sugar drops dangerously low. This is particularly risky because the first sign of a problem may be confusion, slurred speech, or loss of consciousness. If you’re caring for someone who has experienced this, more frequent blood sugar checks throughout the day and keeping fast-acting carbs within arm’s reach become especially important.
When the Person Can’t Eat or Drink
If someone is unconscious, having a seizure, too confused to swallow safely, or slurring their speech, do not put food or liquid in their mouth. They could choke. This is a medical emergency.
Glucagon is the emergency treatment for this situation. It’s a hormone that signals the liver to release stored sugar into the bloodstream. It comes in several forms: a nasal spray (no injection needed), a pre-filled auto-injector pen, and a traditional injection kit. The nasal spray and auto-injector are designed so that someone with no medical training can use them. If someone in your household takes insulin, ask their doctor about keeping glucagon on hand and learn how to use it before an emergency happens.
If glucagon isn’t available or you don’t know how to use it, call 911 immediately. Even if you do administer glucagon, calling for emergency help is still appropriate for any episode involving unconsciousness or seizures.
Understanding Severity Levels
Not all lows are equally dangerous. Current guidelines classify hypoglycemia into three levels. Level 1 is any reading at or below 70 mg/dL. This is the threshold where you should start the 15-15 rule, even if the person feels okay. Level 2 is a reading at or below 54 mg/dL, which requires immediate treatment and closer monitoring. Level 3 is severe hypoglycemia, typically below 50 mg/dL, where the person has significant confusion or loss of consciousness and needs someone else’s help to recover.
The lower the number, the more urgently the person needs sugar. At Level 1, you have time to calmly grab juice and follow the protocol. At Level 2 or 3, every minute matters. Repeated episodes of severe hypoglycemia carry real long-term risks, including increased chances of heart attack and stroke in the following year. Recognizing and treating lows early, before they become severe, is one of the most important things a caregiver can do.
Special Considerations for Children
Children need less sugar than adults to correct a low. A small child may only need 5 to 10 grams of fast-acting carbohydrates rather than the full 15 grams recommended for adults. Half a juice box or 1 to 2 glucose tablets is often enough for a young child. The same 15-minute recheck applies. Overcorrecting a low in a child can cause a sharp spike, so starting with a smaller dose and rechecking is the safer approach. Your child’s diabetes care team can provide specific guidance based on their age and weight.