If your blood sugar drops below 70 mg/dL, the fastest way to stabilize it is the 15-15 rule: eat 15 grams of fast-acting carbohydrates, wait 15 minutes, then recheck. If it’s still under 70, repeat. Once your levels come back up, eating a balanced snack or meal within 15 to 30 minutes keeps them from crashing again. That’s the immediate fix, but stabilizing blood sugar long-term takes a different approach depending on why it drops in the first place.
The 15-15 Rule for Immediate Treatment
When you feel the telltale signs of low blood sugar (shakiness, sweating, confusion, rapid heartbeat), speed matters. Your goal is exactly 15 grams of simple carbohydrates, not more. Overcorrecting with a large meal or sugary drink often sends blood sugar rocketing too high, creating a cycle of spikes and crashes.
Here’s what 15 grams of fast-acting carbs actually looks like:
- Fruit juice: half a cup (4 oz)
- Honey or sugar: 1 tablespoon
- Glucose tablets: 3 to 4, depending on the brand (check the label)
- Regular soda: half a cup (not diet)
After 15 minutes, check again. Blood sugar still below 70 mg/dL? Have another 15 grams. For young children, especially toddlers and infants, smaller amounts are appropriate. Once your reading is back above 70, move on to the next critical step: a follow-up snack or meal.
Why a Follow-Up Meal Matters
Fast-acting carbs work quickly, but they burn off quickly too. Without a follow-up, your blood sugar can drop right back down. Aim to eat a balanced snack or small meal within 15 to 30 minutes of stabilizing.
The key is pairing carbohydrates with protein and a small amount of fat. Protein takes 3 to 4 hours to digest, dramatically slowing the rate at which carbohydrates hit your bloodstream. Fat has a similar braking effect. Fiber-rich carbs digest slower than refined ones. Together, this combination creates a gradual, sustained rise in blood sugar instead of a sharp spike followed by another drop.
Practical combinations that work well: whole grain crackers with cheese or nut butter, yogurt with fruit and a handful of nuts, a turkey sandwich on whole wheat bread, or eggs with toast. The goal isn’t a large meal. It’s enough balanced fuel to keep your blood sugar steady for the next few hours.
What Your Body Does on Its Own
Your body has a built-in rescue system for low blood sugar. When glucose levels start falling, the pancreas releases glucagon, a hormone that signals the liver to dump stored sugar into the bloodstream. At the same time, your adrenal glands release adrenaline (which is why low blood sugar makes you feel shaky and anxious) along with cortisol and growth hormone, all working together to push glucose levels back up.
This system works well in most healthy people. But in those who take insulin or certain diabetes medications, these counterregulatory responses can become blunted over time, especially after repeated episodes of low blood sugar. That’s why people with diabetes often need external intervention (fast carbs, glucagon kits) rather than waiting for the body to self-correct.
Preventing Drops Throughout the Day
If low blood sugar is a recurring problem, the pattern of what and when you eat matters more than any single food choice. Eating every 3 to 4 hours prevents the long gaps that allow blood sugar to drift downward. Each meal or snack should include a source of protein, some fiber-rich carbohydrate, and a modest amount of healthy fat.
One of the most common triggers is eating high-sugar foods on their own. A handful of candy, a glass of juice, or a pastry without any protein alongside it causes a rapid glucose spike followed by a rapid fall. This pattern, sometimes called reactive hypoglycemia, is especially common in people without diabetes who wonder why they feel lightheaded or shaky a couple hours after eating. The fix is straightforward: if you’re going to eat something sweet, pair it with a balanced meal or snack so the sugar absorbs more slowly.
Staying Stable During Exercise
Physical activity pulls glucose out of your bloodstream and into your muscles, which is generally a good thing but can trigger low blood sugar if you’re not prepared. If your blood sugar is below 100 mg/dL before starting exercise, eat about 15 grams of carbohydrates before you begin.
For sustained activity lasting more than 30 minutes, plan to take in 5 to 15 grams of carbs every half hour, adjusting based on intensity and how your body responds. A small banana, a few crackers, or a sports drink can cover this. Checking your blood sugar before, during, and after exercise helps you learn your personal patterns over time.
Preventing Nighttime Lows
Low blood sugar during sleep is particularly concerning because you can’t feel the warning signs while you’re unconscious. Symptoms like waking up drenched in sweat, having nightmares, or feeling groggy and headachy in the morning can all point to overnight drops.
A balanced bedtime snack that combines carbohydrate, protein, fat, and fiber helps maintain blood sugar through the night. Think a small apple with peanut butter, or a few whole grain crackers with cheese. If nighttime lows happen frequently despite snacking, that’s a signal that medication timing or dosing may need adjustment.
Continuous Glucose Monitors and Early Alerts
Continuous glucose monitors (CGMs) have changed how people catch low blood sugar before it becomes dangerous. These small sensors, worn on the arm or abdomen, measure glucose levels every few minutes and can alert you when levels are trending down.
Predictive alerts are especially valuable. In one study of adolescents with type 1 diabetes, a CGM set to alarm 20 minutes before glucose hit 70 mg/dL reduced time spent in hypoglycemia by more than 40%. Time in severe hypoglycemia (below 54 mg/dL) dropped by over 60%. People using predictive alerts also needed far less corrective sugar overall, consuming about 30 grams over the study period compared to over 125 grams without predictive alerts. The early warning gave them time to eat a small snack and prevent the low entirely, rather than having to treat a full episode.
When Low Blood Sugar Is an Emergency
Blood sugar below 54 mg/dL is classified as severe hypoglycemia. At this level, confusion, loss of coordination, seizures, and loss of consciousness become real risks. If someone is too disoriented to eat or drink safely, giving them food or liquid can cause choking.
This is where glucagon kits come in. Glucagon is the same hormone your pancreas naturally releases, but delivered as a rescue medication. It’s available as a nasal spray (no injection needed, just a puff into one nostril) or as an injectable kit. Both are prescription items designed for bystanders to administer. If you or someone you live with has a history of severe lows, keeping a glucagon kit accessible and making sure household members know how to use it can be lifesaving.
Anyone who loses consciousness from low blood sugar needs emergency medical attention, even if glucagon brings them around. The episode itself signals that the current management plan isn’t working well enough to prevent dangerous drops.