The fastest way to raise your blood sugar is to eat or drink 15 grams of fast-acting carbohydrates, such as four glucose tablets, half a cup of juice, or a tablespoon of sugar dissolved in water. Most people feel relief within 10 to 15 minutes. How you respond from there depends on what caused the drop and how low your levels have fallen.
The 15-15 Rule for Quick Recovery
The standard approach recommended by the CDC is called the 15-15 rule: consume 15 grams of carbohydrates, then wait 15 minutes and recheck your blood sugar. If it’s still below 70 mg/dL, repeat the process. Keep going until your levels return to your target range.
Good sources of roughly 15 grams of fast-acting carbs include:
- Glucose tablets: 4 tablets (check the label, as brands vary)
- Fruit juice: about half a cup (4 ounces)
- Regular soda: about half a can (4 ounces)
- Table sugar or honey: 1 tablespoon
- Hard candies: a small handful (check grams on the package)
Liquid sources of sugar tend to raise blood sugar faster than solid foods. When you drink juice or a sugar solution, your stomach empties the liquid quickly and glucose reaches your bloodstream in minutes. Solid foods take longer to break down, which delays the peak in blood sugar by roughly 20 to 30 minutes compared to liquids. If you need your levels up quickly, liquids are the better choice.
What to Eat After the Initial Fix
Once your blood sugar is back above 70 mg/dL, the next step matters just as much. Fast-acting carbs spike your glucose but don’t keep it stable for long. If your next meal is more than an hour away, eat a small snack that combines carbohydrates with protein or fat. A handful of crackers with peanut butter, a cheese stick with a piece of fruit, or a small bowl of cereal with milk all work well. The protein and fat slow digestion and help prevent another drop.
Skipping this follow-up snack is one of the most common reasons people experience a second crash shortly after recovering from the first one.
When Someone Can’t Eat or Drink
Severe low blood sugar can cause confusion, seizures, or loss of consciousness. If someone is too disoriented or unconscious to safely swallow, do not put food or liquid in their mouth. They could choke. This is when emergency glucagon is needed.
Glucagon is a hormone that triggers the liver to release stored sugar into the bloodstream. It’s available as a nasal powder (sprayed into one nostril, no inhalation required) and as an injectable kit. The nasal version delivers 3 milligrams in a single dose and can be used in adults and children 1 year and older. If there’s no response after 15 minutes, a second dose can be given. Anyone who uses glucagon should also call emergency services, because the underlying cause needs medical evaluation.
If you take insulin or medications that can cause low blood sugar, keeping a glucagon kit accessible and making sure the people around you know how to use it is worth the effort.
Why Your Blood Sugar Dropped
Understanding the cause helps you prevent it from happening again. For people with diabetes, the most common triggers are straightforward: taking too much insulin, delaying or skipping a meal, eating fewer carbohydrates than planned, or exercising more intensely than usual without adjusting food intake. Alcohol is another significant trigger, especially on an empty stomach. It interferes with the liver’s ability to release glucose and can cause dangerously low blood sugar hours after your last drink.
If you don’t have diabetes, the picture is a bit different. Reactive hypoglycemia, where blood sugar drops a few hours after eating, is the most common form. The exact cause often isn’t clear, but it tends to be connected to what and when you eat. Large meals heavy in refined carbohydrates can trigger an exaggerated insulin response, which then drives blood sugar too low. Other possible causes include previous gastric bypass or bariatric surgery, certain inherited metabolic conditions, and rarely, tumors that affect insulin production.
Preventing Future Blood Sugar Drops
Recurring low blood sugar is worth addressing at the root rather than just treating each episode. Several practical habits make a real difference.
Eat on a consistent schedule. When meals are delayed or skipped, your body runs through its available glucose and levels drop. If you’re actively trying to eat less, cut calories, or reduce carbohydrates, do so gradually. Sudden changes in portion size or carb intake are a common, often overlooked cause of lows.
Pair carbohydrates with protein, fat, or fiber at every meal. A slice of toast alone will spike and then crash your blood sugar faster than toast with eggs and avocado. The added macronutrients slow the absorption of glucose and keep levels steadier for hours.
Plan around exercise. Physical activity pulls glucose from your bloodstream and can continue to lower blood sugar for hours afterward. Having a snack before or after a workout, particularly one that includes carbs, helps bridge the gap. If you take insulin, your provider may need to adjust your dose or timing around periods of higher activity.
Be cautious with alcohol. Drinking on an empty stomach is especially risky because the liver prioritizes metabolizing alcohol over maintaining blood sugar. If you drink, eat something beforehand and monitor your levels closely in the hours that follow.
Recognizing the Warning Signs
Low blood sugar typically announces itself before it becomes dangerous. Early symptoms include shakiness, sweating, a fast heartbeat, irritability, and sudden hunger. As levels drop further, you may notice confusion, blurred vision, difficulty concentrating, or slurred speech. These are signs to act immediately with fast-acting carbs rather than waiting to see if the feeling passes.
Some people, particularly those who experience frequent lows, develop what’s called hypoglycemia unawareness. The body stops producing the usual warning signals, and blood sugar can fall to dangerous levels without any noticeable symptoms. If you’ve had episodes where your blood sugar was very low but you felt fine, that pattern itself is worth discussing with a healthcare provider, because it increases the risk of a severe episode.