When your blood sugar drops below 70 mg/dL, you need fast-acting carbohydrates immediately. The goal is to get about 15 grams of simple sugar into your system as quickly as possible, then recheck and stabilize. What you choose matters: the wrong food can delay your recovery by slowing absorption, while too much can send your blood sugar soaring in the other direction.
The 15-15 Rule
The standard approach to treating a low is simple: eat 15 grams of fast-acting carbohydrates, wait 15 minutes, then check your blood sugar again. If it’s still below 70 mg/dL, repeat. Keep going until your levels return to your target range.
This method works because 15 grams is enough to raise blood sugar meaningfully without overdoing it. Once you’ve brought your number back up, eat a balanced snack or small meal that includes both protein and carbohydrates. That follow-up meal is what keeps your blood sugar from crashing again.
Best Fast-Acting Foods for a Low
You want foods that are almost pure simple sugar, with little fat, fiber, or protein to slow digestion. Any of these will give you roughly 15 grams of carbohydrates:
- 3 glucose tablets
- ½ cup (4 ounces) of fruit juice or regular soda
- 6 or 7 hard candies
- 1 tablespoon of sugar (dissolved in water or eaten straight)
Liquids tend to work fastest. Juice and regular soda leave the stomach more quickly than solid foods, which means glucose reaches your bloodstream sooner. If you’re feeling shaky and need the quickest possible response, juice or a few sips of regular soda is your best bet. Glucose tablets are another reliable option because each tablet contains a precise amount of sugar, making it easy to avoid guessing.
What Not to Eat During a Low
It’s tempting to reach for chocolate, a peanut butter sandwich, or a candy bar. These foods do contain sugar, but they also contain fat, and fat slows everything down. When fat enters your stomach alongside carbohydrates, it delays gastric emptying, meaning the sugar takes longer to reach your bloodstream. During a genuine low, that delay matters.
This is also why a full meal isn’t the right first response. A plate of pasta with meat sauce contains plenty of carbohydrates, but the protein, fat, and fiber mixed in will blunt and delay the glucose spike you actually need right now. Save the real food for after you’ve brought your number back up.
Why Eating Too Much Makes Things Worse
When your blood sugar is low, your body screams at you to eat everything in sight. The shaking, sweating, and mental fog create a sense of urgency that makes it hard to stop at half a cup of juice. But overcorrecting causes rebound high blood sugar, which then needs to be managed, creating a frustrating rollercoaster. Over time, repeated overtreatment also contributes to weight gain.
Sticking to exactly 15 grams and then waiting the full 15 minutes is the discipline that prevents this cycle. It helps to have your treatment pre-portioned. Keep a small bottle of juice, a tube of glucose tablets, or a measured bag of hard candies somewhere easy to grab so you’re not standing in front of the pantry making decisions while your brain is foggy.
Stabilizing After the Initial Treatment
Once your blood sugar is back in range, you’re not done. The fast-acting sugar that rescued you will burn through quickly, and without a follow-up snack, you risk dropping again. The ideal stabilization snack pairs about 15 grams of complex carbohydrates with a source of protein. The protein slows digestion and creates a more gradual, sustained release of glucose.
Good combinations include:
- Half a sandwich with meat, cheese, or peanut butter
- A small piece of fruit with an ounce of cheese
- 6 saltine crackers with a quarter cup of tuna salad
- 8 animal crackers with 2 tablespoons of peanut butter
- 3 cups of plain popcorn with an ounce of nuts
- 15 to 20 baked tortilla chips with refried beans and sliced vegetables
If your next full meal is within 30 minutes or so, you can skip the snack and just eat the meal. The point is to make sure something with staying power follows the quick sugar fix.
When Food Isn’t Enough
If someone with low blood sugar is unconscious, having a seizure, or too confused to swallow safely, do not try to give them food or liquid. There is a real risk of choking. This is when glucagon, an injectable or nasal emergency medication, is needed. Glucagon signals the liver to release stored sugar into the bloodstream, raising levels without requiring the person to eat anything.
If you take insulin, it’s worth having a glucagon kit at home and making sure the people around you know where it is and how to use it. These situations are rare, but when they happen, minutes count.
Preventing Lows If You Don’t Have Diabetes
Not everyone who experiences low blood sugar has diabetes. Reactive hypoglycemia causes blood sugar to drop a few hours after eating, typically after a meal high in simple carbohydrates. The pattern is different from diabetes-related lows, and so is the long-term fix.
If this happens to you regularly, the goal is to prevent the spike that causes the crash. That means reducing simple sugars and refined carbohydrates, the foods that send blood sugar up fast and then let it plummet. Replace them with complex carbohydrates that are higher in fiber, things like whole grains, legumes, and vegetables. These create a gradual rise and a gradual decline instead of a sharp spike.
Pairing carbohydrates with protein and healthy fat at every meal slows digestion further and flattens the curve. Eating smaller meals or snacks every two to four hours, rather than going long stretches without food, also helps keep levels steady throughout the day. Over time, these changes can significantly reduce how often reactive lows occur.