The fastest way to raise low blood sugar is to eat or drink 15 grams of fast-acting carbohydrates, wait 15 minutes, and recheck your levels. Blood sugar below 70 mg/dL is considered low, and most people will feel symptoms like shaking, sweating, or sudden hunger before it drops further. Knowing exactly what to reach for and how much makes the difference between a quick recovery and a prolonged episode.
The 15-15 Rule
This is the standard approach recommended by the CDC and most diabetes organizations. Eat or drink 15 grams of fast-acting carbs, then set a timer for 15 minutes. Check your blood sugar again. If it’s still below 70 mg/dL, repeat the process. Keep going in 15-minute cycles until your reading is back in your target range.
The reason for the structured approach is precision. Eating too little won’t bring your levels up fast enough, and eating too much can send your blood sugar soaring in the other direction. Fifteen grams is enough to raise most people’s glucose meaningfully without overcorrecting.
What to Eat or Drink
Not all carbohydrates work at the same speed. You want simple sugars with no fat or protein slowing them down. Each of the following equals roughly 15 grams of carbs:
- Glucose tablets: 3 to 4 tablets (the fastest option, purpose-built for this)
- Fruit juice: 1/2 cup of apple, orange, or pineapple juice; 1/3 cup of grape or cranberry juice
- Honey, jam, or jelly: 1 tablespoon
- Regular soda: about 4 ounces (not diet)
Glucose tablets are the most reliable choice because they’re pre-measured and absorb quickly. Juice is the next best option and easy to keep on hand. Avoid chocolate, cookies, or ice cream as your first response. Their fat content slows digestion, which delays the glucose from reaching your bloodstream when you need it most.
Follow Up With a Real Snack
Once your blood sugar is back above 70 mg/dL, the job isn’t done. Fast-acting carbs burn through quickly, and without something more substantial, your levels can dip again within an hour or two. Eat a small snack or meal that combines complex carbohydrates with protein and healthy fat. This combination slows digestion and gives you a steadier supply of glucose over the next few hours.
A handful of nuts is one of the simplest options because most varieties contain all three: carbs, protein, and fat. Peanut butter on whole-grain crackers, cheese with an apple, or a small sandwich all work well. The goal is to prevent a second drop, not to eat a large meal.
Recognizing the Symptoms
Your body gives two types of warning signals when blood sugar drops, and they tend to arrive in a predictable order. The early signs come from your stress hormones kicking in: shaking, sweating, a racing heartbeat, sudden hunger, and anxiety. These symptoms typically appear when glucose falls below 70 mg/dL.
If blood sugar continues to drop below 54 mg/dL, the brain itself starts running short on fuel. This produces a different set of symptoms: confusion, difficulty speaking, drowsiness, blurred vision, and poor coordination. At this stage, thinking clearly becomes harder, which is exactly why it’s important to act on the earlier warning signs before they progress. Severe hypoglycemia, the most dangerous level, means a person can no longer help themselves and may lose consciousness or have seizures.
Why Overtreating Is a Real Problem
When you feel shaky and lightheaded, the instinct is to eat everything in sight. This is one of the most common mistakes. Consuming far more than 15 grams of carbs at once often sends blood sugar rocketing upward, sometimes well above your target range. This roller coaster is exhausting and makes glucose harder to manage for the rest of the day.
A related phenomenon can happen overnight. If blood sugar drops too low while you’re sleeping, your body releases a surge of stress hormones, including adrenaline, to rescue you from the low. This hormone response can push your morning blood sugar unusually high. If you’re waking up with unexplained high readings, an undetected nighttime low may be the cause.
Preventing Nighttime Lows
Nocturnal hypoglycemia is particularly risky because you’re asleep and may not notice symptoms. Checking blood sugar at bedtime is one of the simplest preventive steps. If your reading is on the lower end of your target range, a small bedtime snack with protein and complex carbs can provide a slow, steady source of glucose through the night.
Continuous glucose monitors with low-glucose alerts have also changed the game for people prone to nighttime drops. These devices sound an alarm when your glucose hits a set threshold, waking you up before levels fall dangerously low.
When Someone Can’t Treat Themselves
If a person with low blood sugar is confused, unconscious, or having a seizure, never put food or drink in their mouth. They could choke or aspirate liquid into their lungs. This is where glucagon becomes essential.
Glucagon is a hormone that signals the liver to release stored glucose. It’s available in two forms designed for non-medical people to use in emergencies. A nasal spray requires no preparation: you simply spray it into one nostril while holding the other closed. A pre-filled auto-injector works like an epinephrine pen and goes into the thigh. Neither requires medical training to administer. If there’s no response after the first dose, a second dose can be given.
If you use insulin or take medications that can cause low blood sugar, keep glucagon where the people around you can find it. Make sure your household members, close coworkers, or school staff know where it is and how to use it. Call 911 after administering glucagon if the person doesn’t regain consciousness within 10 to 15 minutes.
Hypoglycemia Unawareness
Some people, particularly those who have had diabetes for many years or experience frequent lows, gradually lose the ability to feel the early warning symptoms. This condition means the shaking, sweating, and hunger that normally alert you to a drop simply don’t show up. Blood sugar can fall to dangerously low levels without any noticeable signs.
The good news is that awareness can often be restored. The key strategy is strictly avoiding low blood sugar episodes for several weeks. This “reset” allows your body to recalibrate its alarm system. In practice, this usually involves adjusting medications, eating on a more consistent schedule, and using a continuous glucose monitor to catch drops before they become symptomatic. Over time, many people regain the ability to feel lows again.
Keeping Supplies Within Reach
Low blood sugar doesn’t wait for a convenient moment. Keep glucose tablets or juice boxes in your car, your desk drawer, your nightstand, and your gym bag. If you carry a purse or backpack daily, keep a stash there too. The 15-15 rule only works if you have 15 grams of fast-acting carbs available the moment you need them. A few dollars’ worth of glucose tablets, stored in the right places, is the cheapest insurance you can buy.