When a diabetic person’s blood sugar drops below 70 mg/dL, they need 15 grams of fast-acting carbohydrates right away. The goal is to get sugar into the bloodstream as quickly as possible, which means reaching for simple carbs that the body can absorb in minutes, not foods that take time to digest.
Recognizing a Low Blood Sugar Episode
Low blood sugar, or hypoglycemia, typically announces itself with physical warning signs before it becomes dangerous. The earliest symptoms come from the body’s stress response: sweating, shaking, a pounding heartbeat, anxiety, and sudden intense hunger. These signals usually appear first and give you a window to act.
If blood sugar continues to drop, the brain starts running short on fuel. That’s when confusion, difficulty concentrating, irritability, and slurred speech set in. At this stage the person may not be able to treat themselves and will need help. Below 54 mg/dL is considered severe, and the person may lose consciousness or have seizures.
The 15-15 Rule
The standard approach for treating mild to moderate lows is called the 15-15 rule: give 15 grams of fast-acting carbohydrates, wait 15 minutes, then recheck blood sugar. If it’s still below 70 mg/dL, repeat with another 15 grams. Keep cycling through these steps until blood sugar is back in the target range.
The key word here is “fast-acting.” You want carbohydrates that hit the bloodstream quickly, with minimal fat, protein, or fiber slowing things down. Fat slows digestion significantly, and protein and fiber also delay how quickly carbs get absorbed. That’s why a chocolate bar or a peanut butter sandwich, despite having sugar, is a poor choice for treating an active low. Save those for after recovery.
Best Fast-Acting Foods and Drinks
Each of these provides roughly 15 grams of simple carbohydrates:
- Glucose tablets: 3 to 4 tablets, depending on the brand (check the label). These are the gold standard because the dose is precise and they’re portable.
- Fruit juice: Half a cup (4 ounces) of unsweetened juice like orange or apple.
- Regular soda: About half a cup (4 ounces). Not diet soda, which contains no sugar.
- Honey: 1 tablespoon.
- Hard candies: About 4 to 5 pieces of something like Lifesavers (check the nutrition label for the exact count).
- Glucose gel: One tube, typically sold in pharmacies alongside glucose tablets.
Glucose tablets and glucose gel are worth keeping on hand because they’re designed for exactly this situation. They don’t require refrigeration, they travel well, and there’s no guesswork about the carb count. Juice boxes in the 4-ounce size are another convenient option to stash in a bag, car, or nightstand.
What to Give After Blood Sugar Recovers
Once blood sugar is back above 70 mg/dL, the job isn’t finished. A small snack or meal that combines protein and carbohydrates helps stabilize levels and prevents a second drop. Think crackers with cheese, a small sandwich, yogurt with granola, or an apple with peanut butter. This is the moment when fat and protein are helpful, because now you want a slow, steady release of glucose rather than a quick spike.
If a meal is coming within the next 30 to 60 minutes, you can skip the extra snack and just eat the meal. The point is to give the body a longer-lasting fuel source so blood sugar doesn’t crash again.
What to Do in a Severe Emergency
If the person is unconscious, having a seizure, or too confused to swallow safely, do not try to put food or liquid in their mouth. They could choke. This situation calls for glucagon, a hormone that signals the liver to release stored sugar into the bloodstream.
Glucagon comes in a few forms that someone nearby can administer without medical training. A nasal spray version (sold as Baqsimi) is sprayed into one nostril, no inhalation needed. There are also auto-injectors that go under the skin of the arm, belly, or thigh, similar to an EpiPen. Older glucagon kits require mixing a powder with liquid before injecting into muscle, which is more complex under pressure. If a glucagon product is available, use it and call emergency services. If no glucagon is on hand, call 911 immediately.
Anyone who uses insulin or medications that can cause lows should have a glucagon product accessible, and the people around them should know where it’s stored and how to use it. Most products include simple visual instructions on the packaging.
What Not to Give
Some foods seem like logical choices but actually work too slowly when blood sugar is actively dropping:
- Chocolate: High in fat, which delays sugar absorption.
- Ice cream: Also high in fat. The sugar takes too long to reach the bloodstream.
- Whole grain bread or pasta: The fiber slows digestion considerably.
- Diet drinks or sugar-free candy: These contain no actual sugar and will do nothing for a low.
The instinct to grab whatever sweet thing is nearby is understandable, but during an active low, speed matters more than calories. A few glucose tablets or a small glass of juice will raise blood sugar faster than a large, rich dessert.
Keeping Supplies Within Reach
Lows don’t always happen at convenient times. Keeping glucose tablets or juice boxes in multiple locations reduces the scramble: by the bed, in a desk drawer, in the car, in a purse or backpack. If you live with or regularly spend time with someone who has diabetes, knowing where their supplies are stored can make a real difference in an emergency. A few dollars’ worth of glucose tablets tucked into the right places is one of the simplest precautions in diabetes management.