When your blood sugar drops below 70 mg/dL, you need to eat or drink 15 to 20 grams of fast-acting carbohydrates right away. This is the single most important step, and acting quickly prevents symptoms from getting worse. Most low blood sugar episodes resolve within 15 minutes of eating the right foods, but what you eat, when you recheck, and what you do afterward all matter.
How to Recognize a Low
Low blood sugar produces two waves of symptoms. The first comes from your body’s stress response: shakiness, sweating, a racing heart, anxiety, and sudden intense hunger. These are your early warning signs, and they’re the easiest to act on.
If your blood sugar continues to fall, a second set of symptoms appears as your brain starts running short on fuel. These include difficulty concentrating, confusion, blurred vision, weakness, dizziness, and behavior that others might mistake for intoxication. At very low levels, you can lose the ability to treat yourself, which is why catching and treating the early symptoms quickly is so important.
The 15-15 Rule
The standard approach is simple: eat 15 grams of fast-acting carbohydrates, wait 15 minutes, then recheck your blood sugar. If it’s still below 70 mg/dL, repeat with another 15 grams. Keep cycling until your number comes back up.
The key word here is “fast-acting.” You want sugar that hits your bloodstream quickly, which means avoiding anything with significant fat, protein, or fiber. Chocolate, peanut butter crackers, and whole fruit all slow down absorption. Stick to these instead:
- Glucose tablets: 3 to 4 tablets (follow the package)
- Juice: 4 ounces (half a cup) of orange juice or apple juice
- Regular soda: 4 ounces of non-diet soda
- Sugar or honey: 1 tablespoon
- Glucose gel: 1 tube
- Hard candies or jellybeans: check the label for 15 grams’ worth
Glucose tablets are the most precise option because each tablet contains a known amount of carbohydrate. They’re also easy to keep in a bag, a car glove box, or a nightstand drawer. Whatever you choose, keep it accessible at all times.
What to Eat After Your Sugar Comes Back Up
Getting your blood sugar above 70 mg/dL is only half the job. The fast-acting carbs you just ate will burn through quickly, and without a follow-up, your blood sugar can drop right back down. Within 15 to 30 minutes of stabilizing, eat a balanced meal or a substantial snack that includes protein, complex carbohydrates, and some fat.
Good options include a turkey or peanut butter sandwich, cheese and crackers, yogurt with granola, or a bowl of cereal with milk. The protein and fat slow digestion and help keep your blood sugar steady over the next few hours. This step is especially important if your next full meal is more than an hour away.
If the low happens at night, an evening snack combining carbohydrate, protein, fat, and fiber (like a sandwich with some protein) helps prevent another drop while you sleep.
Understanding Severity Levels
Not every low is the same. Blood sugar between 54 and 69 mg/dL is considered mild. You’ll likely feel symptoms and can treat it yourself. Below 54 mg/dL is moderate and needs faster attention, as cognitive symptoms like confusion become more likely.
A severe low is any episode where you need help from another person because your mental or physical state has changed enough that you can’t treat yourself. If someone near you is experiencing a severe low and can’t safely swallow food or drink, they need emergency glucagon, not juice. If you take insulin or medications that can cause lows, talk with your care team about having a glucagon kit on hand and making sure the people around you know how to use it.
CGM Users: Mind the Lag
If you use a continuous glucose monitor, keep in mind that the sensor reads glucose from the fluid under your skin, not directly from your blood. When your blood sugar is dropping quickly, the sensor can lag behind your actual blood sugar by up to 15 minutes. That means your real blood sugar may already be lower than your CGM shows.
If your CGM is trending down rapidly and you’re starting to feel symptoms, treat based on how you feel rather than waiting for the number to cross a threshold. A fingerstick meter gives you a more accurate snapshot in the moment if you have one available.
When You Stop Feeling the Warning Signs
Some people, particularly those who experience frequent lows, gradually lose the ability to feel early symptoms like shakiness and sweating. This is called hypoglycemia unawareness, and it happens because repeated low episodes essentially retrain the brain’s alarm system. The stress hormones that normally trigger those warning signs become blunted, so your blood sugar can drop to dangerous levels before you notice anything is wrong.
The most effective way to restore symptom awareness is to strictly avoid low blood sugar episodes for a sustained period. Over time, the body’s warning system can at least partially reset. Continuous glucose monitors with low alerts are particularly useful here because they catch drops you can’t feel. Structured education programs that teach pattern recognition and risk awareness also help. For people with severe, recurring episodes that don’t respond to other strategies, pancreas or islet cell transplantation is an option that can virtually eliminate lows and restore symptom recognition.
Driving and Other Safety Concerns
Do not drive if your blood sugar is low. Even mild hypoglycemia can impair your reaction time, coordination, and judgment in ways that mimic alcohol impairment. The National Highway Traffic Safety Administration recommends checking your blood sugar before getting behind the wheel and not starting the car until your level has returned to your normal range.
The same principle applies to any activity where impaired focus or coordination could put you or others at risk: operating machinery, swimming, climbing. If you feel symptoms while driving, pull over safely, treat the low, wait until your blood sugar has fully recovered, and then continue. Keep fast-acting carbs in your car at all times so you’re never caught without them.
Preventing the Next Low
If lows happen regularly, that’s a signal to look at the bigger picture. Common triggers include skipping or delaying meals, exercising more than usual without adjusting food intake, taking too much insulin or certain diabetes medications, and drinking alcohol without eating. Keeping a brief log of when lows happen and what preceded them can reveal patterns that are easy to miss in the moment.
Eating balanced meals and snacks at consistent intervals throughout the day, pairing carbohydrates with protein and fat, and planning ahead around exercise all reduce how often lows occur. If you’re making these adjustments and still experiencing frequent drops, that’s worth bringing to your care team so your medication or insulin doses can be reviewed.