When your blood sugar drops below 70 mg/dL, fast-acting carbohydrates are the best immediate fix. Glucose tablets, fruit juice, regular soda, and hard candies all work quickly to bring levels back up. But what you eat afterward matters just as much, because without a follow-up snack containing protein and complex carbs, your blood sugar can crash again within the hour.
How to Recognize a Low
Your body sends clear signals when blood sugar starts falling. Early symptoms include shakiness, sweating, a fast heartbeat, sudden hunger, and feeling lightheaded or anxious. You might have trouble concentrating or notice tingling in your lips or tongue. These warning signs are your cue to act.
If blood sugar continues to drop, symptoms escalate to confusion, slurred speech, blurry vision, and loss of coordination. At its most severe, low blood sugar can cause seizures or loss of consciousness. Catching it early makes treatment simple. Waiting makes it dangerous.
The 15-15 Rule for Immediate Treatment
The standard approach is called the 15-15 rule: eat 15 grams of fast-acting carbohydrates, wait 15 minutes, then check your blood sugar. If it’s still below 70 mg/dL, repeat the process. Keep going until your levels are back in your target range.
Any of these provides roughly 15 grams of carbohydrates:
- 3 glucose tablets
- Half a cup (4 ounces) of fruit juice or regular soda
- 6 or 7 hard candies
- 1 tablespoon of sugar
Glucose tablets are the most precise option because each tablet is a measured dose. Juice and soda work nearly as fast. Regular sugar dissolved in water is fine in a pinch. The key is speed: you want simple carbohydrates that hit your bloodstream quickly.
What Not to Eat During a Low
This is where people often make mistakes. Reaching for a chocolate bar or a spoonful of peanut butter feels intuitive, but fat, fiber, and protein all slow down how quickly your body absorbs sugar. A candy bar with chocolate and nuts might take 30 to 45 minutes to raise your blood sugar meaningfully, while glucose tablets or juice start working within minutes.
Save the protein and complex carbs for after you’ve treated the immediate low. During the low itself, you want pure, simple sugar with as little fat and fiber as possible.
The Follow-Up Snack That Prevents a Second Drop
Once your blood sugar is back above 70 mg/dL, eat a balanced snack or small meal that combines protein with complex carbohydrates. The fast-acting sugar you just consumed will be used up quickly, and without something more substantial, your blood sugar can drop right back down.
Good follow-up options include whole-grain crackers with cheese, half a sandwich with lean protein, or yogurt with granola. The protein slows digestion and helps keep your blood sugar stable for the next few hours. Think of the fast-acting carbs as the rescue and the follow-up snack as the safety net.
Preventing Lows Overnight
Nocturnal hypoglycemia, where blood sugar drops while you’re asleep, is particularly tricky because you can’t feel the warning signs. You might wake up with a headache, damp sheets from sweating, or feel unusually tired despite a full night of sleep. Some people experience nightmares.
A bedtime snack that pairs carbohydrates with protein can help keep blood sugar stable through the night. Whole-grain crackers with cheese, yogurt with granola, or half a sandwich with lean protein all work well. Tracking your nighttime and morning blood sugar readings over time helps you figure out whether a bedtime snack makes a difference for you and which combinations work best.
When Someone Else Needs to Step In
Severe hypoglycemia, generally defined as blood sugar dropping below 54 mg/dL or becoming too confused to treat yourself, requires help from another person. If you can’t eat or drink safely, a glucagon treatment is the next step. Glucagon signals your liver to release stored sugar into your bloodstream, raising levels back toward normal.
Glucagon comes in several forms. Nasal spray versions are sprayed into one nostril and don’t require the person to be conscious or cooperative. Injectable versions go into the muscle or under the skin of the arm, belly, or thigh. If you take insulin or medications that can cause lows, it’s worth having one of these on hand and making sure the people around you know where it is and how to use it.
Hypoglycemia Unawareness
Some people lose the ability to feel the early warning signs of low blood sugar. This condition, called hypoglycemia unawareness, develops when frequent lows essentially train your body to stop sounding the alarm. Without shakiness, sweating, or that familiar jittery feeling, blood sugar can plummet to dangerous levels before you realize anything is wrong.
There’s no permanent cure, but it is sometimes reversible. Carefully avoiding low blood sugar for several weeks can help restore some of your body’s warning system. During this period, your target blood sugar range may be set higher than usual to create a buffer. A continuous glucose monitor is especially useful here, since it can alert you to dropping levels before symptoms would normally appear.
Keeping Lows From Happening
Treating a low is straightforward once you know what to reach for. Preventing lows takes a bit more planning. Eating meals and snacks at consistent times, pairing carbohydrates with protein to slow absorption, and not skipping meals are the basics. Physical activity lowers blood sugar, so checking your levels before, during, and after exercise helps you learn your patterns.
Alcohol is another common trigger, since it can block your liver from releasing stored sugar and cause delayed lows hours after drinking. If you drink, eating something with your beverage and checking your blood sugar before bed reduces the risk. Over time, you’ll start to recognize the situations that put you at risk and can plan around them.