If your blood sugar drops too low, eating 15 grams of fast-acting carbohydrates and rechecking after 15 minutes is the standard first response. This approach, known as the 15-15 rule, works for most mild to moderate episodes. But what you do next depends on the severity, what caused the drop, and whether it keeps happening.
How to Recognize Low Blood Sugar
Low blood sugar (hypoglycemia) typically announces itself with early warning signs driven by your body’s stress response: sweating, a pounding or racing heart, shaking hands, anxiety, and sudden intense hunger. These symptoms show up first because your body is trying to push glucose into your bloodstream and alert you to eat something.
If blood sugar continues to fall, a second wave of symptoms appears as your brain starts running short on fuel. These include confusion, difficulty concentrating, irritability, slurred speech, and trouble with coordination. In rare and extreme cases, hallucinations, seizures, or loss of consciousness can occur. The early warning signs exist specifically to give you time to act before things progress, so learning to recognize them matters.
The 15-15 Rule for Mild Episodes
For a blood sugar reading below 70 mg/dL (or whenever you feel symptoms coming on), the goal is to raise your levels quickly without overcorrecting. Eat or drink 15 grams of fast-acting carbohydrates, then wait 15 minutes for the sugar to reach your bloodstream. If you don’t feel better or your reading is still low, repeat with another 15 grams.
The key word here is “fast-acting.” You want something your body can absorb quickly, not foods with fat or fiber that slow digestion. Good options include:
- Glucose tablets (follow the package for the right number to hit 15 grams)
- 4 ounces of juice or regular soda (not diet)
- A tablespoon of honey or sugar
- Hard candies (like 4 to 5 Lifesavers)
Once your blood sugar returns to a safe range, eat a small meal or snack that includes some protein and complex carbohydrates to keep it stable. A handful of crackers with peanut butter or a half sandwich works well. Without this follow-up, your levels can drop again within an hour or two.
What to Do in a Severe Episode
Severe hypoglycemia is a medical emergency. If someone is unconscious, having a seizure, or unable to swallow, they cannot safely eat or drink anything. This is when glucagon, a hormone that signals the liver to release stored glucose, becomes essential.
Glucagon is available in several forms. Nasal spray versions like Baqsimi require no injection and no inhalation. You simply spray it into one nostril while the person is lying on their side. Pre-filled auto-injectors (such as the Gvoke HypoPen) work like an EpiPen and are designed for people with no medical training to use in a crisis. Traditional glucagon emergency kits require mixing a powder with liquid before injecting, which makes them slightly harder to use under pressure.
If you take insulin or medications that can cause severe lows, having a glucagon product on hand and making sure the people around you know where it is and how to use it can be lifesaving. Someone nearby should also call emergency services if the person doesn’t respond within 10 to 15 minutes.
Preventing Overnight Lows
Blood sugar can drop during sleep without waking you, which makes nighttime hypoglycemia particularly risky. You might wake up with a headache, damp sheets from sweating, or a sense of fatigue that doesn’t match how long you slept. Some people sleep through it entirely and only discover it through a glucose monitor’s data the next morning.
A bedtime snack that combines carbohydrates with protein and a little fat is one of the most effective preventive strategies, especially when your blood sugar is below 130 mg/dL at bedtime. Aim for 15 to 30 grams of carbohydrate paired with a protein source. The protein appears to help sustain blood sugar levels through the night, likely because of the slow, steady way your body metabolizes it.
Practical bedtime snack options include six whole-grain crackers with peanut butter, a slice of whole wheat bread with turkey or cheese, a quarter cup of hummus with half a pita, or a quarter cup of cottage cheese with half a banana. Each of these provides roughly 15 to 20 grams of carbohydrate along with enough protein to help buffer overnight drops.
When You Stop Feeling the Warning Signs
Some people who experience frequent low blood sugar episodes gradually lose the ability to feel the early symptoms. The sweating, shaking, and hunger that normally serve as alarms become muted or disappear entirely. This condition, sometimes called hypoglycemia unawareness, is especially common in people with long-standing type 1 diabetes or anyone who has frequent lows.
The good news is that awareness can often be restored, at least partially, by carefully avoiding hypoglycemia for a period of weeks. When your body goes without repeated lows, it recalibrates and starts producing warning symptoms again at higher glucose levels, giving you back that early detection system. This typically means working with a care team to adjust insulin doses, set higher glucose targets temporarily, and use more frequent monitoring.
Continuous glucose monitors (CGMs) play a significant role here. These devices track your glucose levels around the clock and can alert you when levels are dropping, even if your body no longer sends those signals on its own. In a study of insulin-treated drivers with diabetes, using CGM low-glucose alerts cut the incidence of low blood sugar while driving from 33% to 19%. For people with type 1 diabetes specifically, the time spent in hypoglycemic ranges decreased significantly when alerts were active.
Low Blood Sugar Without Diabetes
Not everyone who experiences low blood sugar has diabetes. Reactive hypoglycemia, where blood sugar drops a few hours after eating, can happen in people with no blood sugar condition at all. The cause is often unclear, though it tends to be connected to what and when you eat. Large meals heavy in refined carbohydrates can trigger a surge of insulin that overshoots and pulls blood sugar too low.
Other possible causes include alcohol consumption (which can block your liver’s ability to release glucose), prior bariatric surgery (which changes how quickly food moves through your digestive system), inherited metabolic disorders, and certain rare tumors that produce excess insulin. If you’re experiencing repeated episodes of low blood sugar and you don’t take diabetes medications, it’s worth investigating the underlying cause rather than just treating each episode as it comes.
For reactive hypoglycemia, the most effective day-to-day strategy is eating smaller, more frequent meals that combine protein, healthy fat, and complex carbohydrates. This prevents the rapid spike and crash cycle that triggers symptoms. Reducing sugary drinks, white bread, and other high-glycemic foods makes a measurable difference for most people.