Treating hypoglycemia starts with fast-acting carbohydrates to bring blood sugar back above 70 mg/dL. For mild to moderate episodes, the standard approach is the 15-15 rule: eat 15 grams of fast-acting carbs, wait 15 minutes, then recheck your blood sugar. Severe episodes where someone loses consciousness require emergency glucagon or a call to 911.
The 15-15 Rule for Mild Episodes
When your blood sugar drops below 70 mg/dL, you need glucose fast. The CDC and American Diabetes Association both recommend the same protocol: consume 15 grams of fast-acting carbohydrates, wait 15 minutes, and check your blood sugar again. If it’s still below 70 mg/dL, repeat the process. Keep going until your levels return to your target range.
Good sources of 15 grams of fast-acting carbs include four glucose tablets, 4 ounces (half a cup) of fruit juice, a tablespoon of honey or sugar, or a handful of hard candies. Glucose is the preferred treatment because it raises blood sugar faster than other types of sugar. Avoid reaching for foods high in fat or protein, like chocolate or peanut butter, as your initial treatment. Fat slows digestion, which delays the glucose from reaching your bloodstream when you need it most.
Once your blood sugar stabilizes, eat a small meal or snack to prevent it from dropping again. This is especially important if your next full meal is more than an hour away.
If you use an automated insulin delivery system (an insulin pump paired with a continuous glucose monitor), you may only need 5 to 10 grams of carbs, since the system will also reduce your insulin delivery. The exception is if the low is caused by exercise or a large mealtime insulin dose, in which case the full 15 grams is still appropriate.
Recognizing the Three Levels
Not all lows are the same. Clinicians classify hypoglycemia into three levels, and the distinction matters because it determines how aggressively you need to respond.
- Level 1: Blood sugar between 54 and 70 mg/dL. You’re alert and can treat yourself with the 15-15 rule. Symptoms often include shakiness, sweating, a fast heartbeat, and feeling anxious or irritable.
- Level 2: Blood sugar below 54 mg/dL. This is clinically significant. You can still self-treat, but the risk of confusion and impaired coordination is higher, and repeated episodes at this level should prompt a conversation with your care team about adjusting your treatment plan.
- Level 3: A severe event where you need someone else’s help to recover. There’s no specific blood sugar number that defines it. Instead, it’s defined by altered mental or physical status: confusion, inability to swallow, seizures, or loss of consciousness.
Treating Severe Hypoglycemia
If someone can’t swallow or loses consciousness from low blood sugar, do not try to put food or liquid in their mouth. They need glucagon, a hormone that signals the liver to release stored glucose into the bloodstream.
Two forms of glucagon are widely available and designed so that family members, coworkers, or school staff can use them without medical training. Nasal glucagon comes in a single-dose device that delivers a fixed 3 mg dose into one nostril. You insert the tip, press the plunger until a green line disappears, and you’re done. The person doesn’t even need to inhale. The auto-injector works like an EpiPen: press it against the outer thigh, lower abdomen, or upper arm, and it delivers the dose under the skin automatically.
Anyone who takes insulin should have a glucagon prescription on hand, and the people around them should know where it is and how to use it. Call 911 if glucagon isn’t available, if you’re unsure how to administer it, or if the person doesn’t regain consciousness after receiving it. Seizures and prolonged unconsciousness are medical emergencies.
Common Triggers to Watch For
Understanding what causes your lows is just as important as knowing how to treat them. The most common triggers for people with diabetes include taking too much insulin, delaying or skipping meals, and exercising more intensely or longer than usual without adjusting carb intake or insulin doses.
Alcohol is a less obvious but significant trigger. When you drink, your liver prioritizes breaking down alcohol over producing glucose. Normally, the liver steadily releases glucose between meals to keep blood sugar stable. Alcohol suppresses this process, particularly the liver’s ability to make new glucose from non-sugar sources. If your liver’s stored glucose is already low (because you haven’t eaten much), alcohol can cause a sustained and sometimes severe drop. The risk is highest when you drink on an empty stomach or after a prolonged period without food. The liver also struggles to replenish its glucose stores while processing alcohol, which means the vulnerability can extend for hours after your last drink.
Preventing Lows if You Don’t Have Diabetes
Hypoglycemia also affects people without diabetes, most commonly as “reactive hypoglycemia,” where blood sugar crashes a few hours after eating, particularly after meals high in refined carbohydrates. It’s also seen after bariatric surgery, where changes to the digestive tract cause rapid glucose absorption followed by an exaggerated insulin response.
Dietary changes are the primary treatment. The goal is to prevent the sharp post-meal blood sugar spikes that trigger excessive insulin release. Research supports keeping carbohydrates to around 30 grams per meal and 15 grams per snack, choosing low-glycemic options like whole grains, legumes, and non-starchy vegetables over white bread, sugary drinks, and sweets. Each meal should include both protein (roughly 30 grams) and healthy fats to slow digestion and produce a more gradual rise in blood sugar.
Meal timing matters too. Eating every 3 to 4 hours prevents long gaps that leave you vulnerable. Separating liquids from meals by at least 30 to 60 minutes can also help, because drinking during meals speeds up how quickly food moves through the digestive tract. Eating slowly, over 30 to 60 minutes when possible, with smaller bites and thorough chewing, further reduces the speed of glucose absorption. Avoiding alcohol and caffeine is also recommended, as both can interfere with blood sugar regulation.
Before physical activity, check your blood sugar and make sure it’s at least 80 mg/dL. If it’s borderline, a small snack with about 15 grams of low-glycemic carbs and 5 to 8 grams of fat provides a buffer.
When You Stop Feeling the Warning Signs
Some people who experience frequent lows gradually lose the ability to sense them. This is called hypoglycemia unawareness, and it’s dangerous because the usual warning signs (shakiness, sweating, rapid heartbeat) no longer kick in before blood sugar drops to levels that impair thinking and coordination.
The primary treatment is strict avoidance of low blood sugar for a sustained period. Research shows that carefully preventing lows for several weeks can partially restore the body’s ability to detect and respond to dropping glucose levels. This often requires raising blood sugar targets temporarily and, in some cases, loosening glycemic goals.
Continuous glucose monitors are particularly valuable here. They provide real-time readings and alerts when blood sugar is falling, essentially replacing the internal alarm system that’s gone quiet. Automated insulin delivery systems take this further by reducing insulin delivery automatically when glucose trends downward.
Structured education programs also help. These programs train people to recognize subtle symptoms they might otherwise dismiss, identify personal risk patterns, and address the psychological barriers that sometimes lead people to tolerate frequent lows rather than adjust their treatment. The ADA recommends screening for hypoglycemia unawareness at least once a year for anyone at risk.
Adjusting Your Treatment Plan After Severe Lows
A single episode of level 2 or level 3 hypoglycemia should trigger a review of your overall diabetes management. This might mean reducing insulin doses, switching to a different medication, changing the timing of injections, or setting higher blood sugar targets. The 2025 ADA Standards of Care are clear that repeated significant lows are not an acceptable trade-off for tighter glucose control.
If you experience frequent hypoglycemia, ask your care team about continuous glucose monitoring if you’re not already using it. Keeping a log of when lows happen, what you ate, how much you exercised, and what medications you took gives your provider the data they need to identify patterns and make precise adjustments. Fear of hypoglycemia is also worth discussing openly. It’s common, it’s rational, and there are evidence-based approaches to manage it that don’t require you to simply run your blood sugar higher.