Fixing hypoglycemia starts with fast-acting carbohydrates to raise your blood sugar right now, then shifts to dietary and lifestyle changes that keep it from dropping again. Blood sugar below 70 mg/dL is considered low, while anything under 54 mg/dL is clinically significant and needs immediate attention. How you approach the fix depends on whether you’re dealing with an acute episode or a recurring pattern.
The 15-15 Rule for an Immediate Low
If your blood sugar is low right now, the standard approach is simple: eat 15 grams of fast-acting carbohydrates, then wait 15 minutes. That’s enough time for the sugar to reach your bloodstream. If you still don’t feel better after 15 minutes, eat another 15 grams and recheck.
Foods that deliver roughly 15 grams of carbohydrates include:
- 3 glucose tablets
- Half a cup (4 ounces) of fruit juice or regular soda
- 6 or 7 hard candies
- 1 tablespoon of sugar
The key word here is “fast-acting.” You want simple sugars that hit your bloodstream quickly, not a sandwich or a granola bar. Those take too long to digest when your blood sugar is already dropping. Save the more complex food for after you’ve stabilized, as a follow-up snack to keep your levels from crashing again.
Severe Episodes Need Outside Help
Severe hypoglycemia means your blood sugar has dropped low enough that you can’t think clearly or treat yourself. You may become confused, lose coordination, or pass out. Nearly 50% of all severe episodes happen at night during sleep, where they can cause seizures or, in rare cases, dangerous heart rhythm changes.
For people at risk of severe lows, prescription glucagon is the emergency backup. It comes in several forms now: auto-injectors, prefilled syringes, and nasal sprays that someone else can administer when you can’t swallow or help yourself. If you take insulin or have had severe lows before, having one of these on hand and making sure the people around you know how to use it is essential.
Preventing Reactive Hypoglycemia With Food
Reactive hypoglycemia is the crash that happens a few hours after eating, typically when a blood sugar spike is followed by an overcorrection. It’s the most common pattern in people who don’t have diabetes, and fixing it is almost entirely about how and what you eat.
The core strategy is eating smaller meals or snacks every two to four hours instead of relying on two or three large meals. This keeps your blood sugar from swinging dramatically in either direction. Each time you eat, pair complex carbohydrates with protein and healthy fat. Adding protein and fat slows down how quickly your body digests carbs, which prevents the sharp spike that leads to a crash. Think of an apple with peanut butter versus an apple by itself.
Choosing high-fiber, low-glycemic foods makes a big difference. Cruciferous vegetables like broccoli, Brussels sprouts, cabbage, and cauliflower are especially high in fiber. Whole grains, legumes, and nuts all create a gradual rise and fall in blood sugar rather than the roller coaster that triggers reactive lows. Foods that combine carbohydrates, protein, and healthy fat in one package (like hummus, yogurt with nuts, or eggs on whole-grain toast) are particularly effective at keeping things steady.
Staying Safe During Exercise
Physical activity pulls sugar out of your bloodstream for fuel, which makes exercise a common trigger for lows. Checking your blood sugar before, during, and after a workout is the most reliable way to stay safe.
If your pre-exercise blood sugar is below 90 mg/dL, you’ll likely need 10 to 30 grams of fast-absorbing carbohydrates before starting, especially for moderate activity lasting longer than 30 minutes. Between 90 and 150 mg/dL, having carbohydrates before and at one-hour intervals during exercise is a reasonable precaution. For longer sessions, plan on roughly 0.5 to 1.0 grams of carbohydrate per kilogram of body weight for every hour of moderate exercise.
If you take insulin, timing matters. Exercise within 90 minutes of an insulin dose requires careful dose adjustment beforehand. For a 30-minute moderate workout, reducing rapid-acting insulin by about 50% is a common guideline. For a 60-minute session at the same intensity, a 75% reduction may be appropriate. These are conversations to have with whoever manages your insulin regimen, because the numbers vary by person.
Preventing Nighttime Lows
Nocturnal hypoglycemia is particularly tricky because most episodes produce no symptoms at all during sleep. You won’t wake up shaking or sweating. Instead, you might notice the aftereffects the next day: low mood, fatigue, or a general sense that something is off. A bedtime snack that combines carbohydrates with protein and fat can help maintain blood sugar through the night. Continuous glucose monitors, which track your levels automatically and can alert you when they drop, have become one of the most effective tools for catching nighttime lows that would otherwise go unnoticed.
Why It Keeps Happening
If hypoglycemia keeps recurring despite eating well and managing medication, something deeper may be driving it. In people with diabetes, the most common culprits are insulin doses that are too high, meals that are too small or too late, and alcohol consumption (which blocks the liver from releasing stored sugar).
In people without diabetes, the list of possible causes is broader. Certain medications can trigger lows, including some antibiotics, anti-inflammatory drugs, antipsychotics, and blood pressure medications. Liver disease, kidney failure, severe infections, and adrenal insufficiency (where the body doesn’t produce enough of the stress hormone cortisol) can all interfere with blood sugar regulation. Rarely, an insulin-producing tumor called an insulinoma causes episodes that typically show up during fasting or after exercise. Recurring, unexplained hypoglycemia warrants blood work and a thorough evaluation to rule out these possibilities.
Hypoglycemia Unawareness
One of the most dangerous complications of frequent lows is losing the ability to feel them coming. Normally, your body responds to dropping blood sugar by releasing adrenaline, which produces the classic warning signs: shakiness, sweating, a racing heart. But when lows happen repeatedly, the body recalibrates. The threshold for triggering those warning signals shifts lower and lower until you get no warning at all. This is called hypoglycemia unawareness, and it dramatically increases the risk of severe episodes, accidents, and injuries.
The good news is that this process is reversible. Even two to three weeks of strictly avoiding hypoglycemia can reset the threshold back toward normal, restoring the early warning symptoms. For people with unawareness, this usually means temporarily running blood sugar targets a bit higher, using a continuous glucose monitor, and being extremely cautious with insulin doses and meal timing until the body’s alarm system recovers.