If your blood sugar has dropped below 70 mg/dL, the fastest natural way to raise it is to eat 15 grams of fast-acting carbohydrates, wait 15 minutes, and recheck. This is known as the 15-15 rule, and it’s the standard approach recommended by the CDC. But if you’re dealing with recurring dips or want to keep your levels stable throughout the day, the strategy goes well beyond a quick sugar fix.
The 15-15 Rule for a Quick Recovery
When your blood sugar drops and you feel shaky, weak, dizzy, or confused, you need something that converts to glucose fast. Eat 15 grams of simple carbohydrates, then wait 15 minutes and test again. If you’re still below 70 mg/dL, repeat. Good options include a small glass of fruit juice (about 4 ounces), a tablespoon of honey, a handful of raisins, or a few hard candies.
These work because they’re high on the glycemic index, meaning your body breaks them down into blood glucose almost immediately. White bread, rice cakes, and most crackers have a similar effect. A serving of white rice raises blood sugar nearly as fast as pure table sugar. In an acute low, that rapid spike is exactly what you want.
What you don’t want is to overcorrect. Eating a large amount of sugar can send your levels soaring, which then triggers a crash a few hours later. Stick to 15 grams at a time and let your body catch up before eating more.
Why Blood Sugar Drops in the First Place
Low blood sugar, or hypoglycemia, happens when your body uses glucose faster than you’re replacing it. For people with diabetes, this is often tied to medication timing, missed meals, or unexpected physical activity. But it also affects people without diabetes, particularly a pattern called reactive hypoglycemia, where blood sugar drops two to five hours after eating.
Reactive hypoglycemia is typically triggered by meals heavy in simple carbohydrates. Foods like white pasta, pancakes, pastries, sweetened drinks, and candy cause a sharp spike in blood sugar followed by an equally sharp drop. Your body overproduces insulin in response to the spike, and the result is a low that leaves you foggy, irritable, and hungry. Alcohol on an empty stomach can make this worse.
Below 70 mg/dL is the threshold where symptoms usually begin. Below 40 mg/dL is considered severe and can cause loss of consciousness or seizures. If someone can’t treat themselves or loses consciousness, that’s a medical emergency requiring outside help.
Eating to Prevent Drops
The most effective long-term strategy is changing what and how you eat so your blood sugar stays steady rather than swinging between highs and lows. The core principle is simple: pair carbohydrates with protein, fiber, and healthy fat. This combination slows digestion dramatically. Protein foods like chicken, fish, eggs, nuts, and cheese take three to four hours to digest, compared to simple carbs that hit your bloodstream in minutes. Fat slows the process even further, creating a gradual, sustained release of glucose instead of a spike.
In practice, this means choosing complex carbohydrates (whole grains, legumes, vegetables) over refined ones, and never eating carbs alone. Instead of plain toast, have toast with peanut butter. Instead of a bowl of white rice, pair brown rice with grilled chicken and vegetables. The Cleveland Clinic recommends shifting toward low-glycemic foods, which are naturally higher in fiber and protein, and combining them with fat and protein at every meal.
Snacks That Keep Levels Stable
Eating every two to four hours prevents the long gaps that lead to fasting dips. Small, balanced snacks between meals are one of the most practical tools for people who experience recurring lows. Some reliable combinations:
- Apple slices with peanut butter: about 15 grams of carbs from the apple with protein and fat from a tablespoon of peanut butter
- Crispbread with cottage cheese: a slow-digesting combination that provides steady energy
- Dried apricots with almonds: the fruit provides quick glucose while the almonds slow absorption
- Natural yogurt with raspberries: protein from the yogurt paired with fiber from the berries
- Hummus with sliced peppers or celery: low-calorie, with enough carbs and fat to maintain levels
- A small slice of cheese with a piece of fruit: a classic pairing that balances all three macronutrients
The goal with snacks isn’t to spike your blood sugar. It’s to give your body a steady supply of fuel so it never drops low enough to cause symptoms.
How Exercise Affects Your Levels
Physical activity uses glucose for fuel, which means it can lower blood sugar during and after a workout. This is especially relevant if you exercise in the evening, because your glucose can continue dropping while you sleep. A nighttime low below 70 mg/dL is particularly risky because you may not feel the symptoms.
A post-workout snack that includes both protein and carbs helps prevent this drop while also supporting muscle recovery. If you exercise regularly and experience lows, keeping a source of fast-acting carbs on hand during workouts (juice, glucose tablets, hard candy) is a practical safeguard. Stop exercising immediately if you feel weak, shaky, dizzy, or confused.
Short bursts of high-intensity exercise can actually spike blood sugar temporarily, particularly in people with type 1 diabetes. This is a normal response and not a concern. The bigger risk is the delayed drop that comes hours later.
Nutrients That Support Glucose Regulation
Several vitamin and mineral deficiencies are linked to problems with blood sugar regulation, and they’re surprisingly common. Among people with type 2 diabetes, 60% are deficient in vitamin D, 42% are low in magnesium, 29% are deficient in vitamin B12, and 28% have low iron levels. These micronutrients play roles in how your body processes glucose and responds to insulin.
Magnesium is particularly worth paying attention to. It’s involved in insulin signaling, and low levels are associated with poorer blood sugar control. Good food sources include nuts, seeds, leafy greens, and whole grains. Vitamin D comes from sun exposure, fatty fish, and fortified foods. B12 is found in meat, eggs, and dairy. If you eat a varied diet with plenty of whole foods, you’re more likely to maintain adequate levels of all of these, but deficiencies are common enough that they’re worth checking if you have persistent blood sugar issues.
Putting It All Together
If you’re in an acute low right now, use the 15-15 rule: 15 grams of fast carbs, wait 15 minutes, recheck. Once you’ve recovered, follow up with a balanced meal or snack to keep your levels from dropping again.
For ongoing management, the strategy shifts to prevention. Eat regular meals every two to four hours. Build every meal and snack around a combination of complex carbs, protein, and healthy fat. Limit simple sugars and refined carbohydrates that cause sharp spikes and crashes. Keep portable snacks available for times when meals are delayed. And if you exercise, plan a carb-and-protein snack afterward, especially before bed.
Blood sugar below 40 mg/dL is a medical emergency. Repeated episodes of hypoglycemia, even mild ones, are worth investigating with a healthcare provider, because they can signal medication issues, hormonal imbalances, or other underlying conditions that dietary changes alone won’t resolve.