If your blood sugar drops below 70 mg/dL, you need 15 grams of fast-acting carbohydrates right away. That means simple sugars your body can absorb quickly: fruit juice, glucose tablets, or regular soda. The goal is to get glucose into your bloodstream within minutes, then follow up with a balanced snack to keep levels stable.
How to Recognize a Low
Your body sends out warning signals when blood sugar starts to fall. The earliest signs come from your stress response: sweating, shakiness, a racing heart, anxiety, and sudden intense hunger. These symptoms are your body’s alarm system, and they typically appear while you still have time to act.
If blood sugar continues to drop, your brain starts running short on fuel. That produces a different set of symptoms: weakness, dizziness, trouble concentrating, blurred vision, and confusion. Some people behave in ways that look like intoxication. A reading below 54 mg/dL requires immediate action because it can progress to fainting or seizures.
The 15-15 Rule
The standard approach recommended by the CDC is straightforward. Eat or drink 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 cycling through until your levels return to your target range.
Here’s what 15 grams of fast-acting carbs looks like in practice:
- 3 glucose tablets (the fastest, most predictable option)
- Half a cup (4 ounces) of fruit juice or regular soda (not diet)
- 6 or 7 hard candies
- 1 tablespoon of sugar dissolved in water or taken straight
These are all simple sugars with almost no fat, fiber, or protein to slow digestion. That’s the point. You want glucose hitting your bloodstream as fast as possible.
What Not to Eat During a Low
This is where people often make mistakes. Reaching for chocolate, peanut butter, cheese, or a sandwich feels instinctive when you’re shaky and hungry, but fat and protein dramatically slow digestion. Fat delays the rise in blood sugar because it takes longer for your body to process. Protein-rich foods like cheese, nuts, and eggs can take three to four hours to fully digest. Even fiber slows carbohydrate absorption.
So during the initial treatment of a low, skip anything with fat or protein. No chocolate bars, no trail mix, no milk (which has both fat and protein). Stick to the pure, fast-acting options listed above. You’ll get to the protein and fat in the next step.
What to Eat After Your Levels Recover
Once your blood sugar is back in your target range, you’re not done. Without a follow-up snack or meal, levels can drop again. The CDC recommends eating a balanced snack or meal that includes both protein and carbohydrates to keep your blood sugar stable.
Good follow-up options include:
- Peanut butter on whole grain toast
- Cheese and crackers
- Greek yogurt with a handful of nuts
- Half a turkey sandwich
- A hard-boiled egg with a piece of fruit
The protein and fat in these snacks slow down carbohydrate digestion, creating a gradual, sustained release of glucose instead of another spike and crash. If your next full meal is within 30 minutes or so, you can skip the snack and just eat the meal.
Preventing Lows at Night
Nighttime lows are particularly risky because you’re asleep and can’t feel the warning signs. If you take insulin or certain diabetes medications, a bedtime snack can act as a buffer. The best choices are high in protein or fiber and low in simple carbs, so they release glucose slowly through the night.
The Mayo Clinic suggests options like a tablespoon of peanut butter with celery, a light cheese stick, a hard-boiled egg, or Greek yogurt. These aren’t meant to raise your blood sugar quickly. They’re designed to provide a slow, steady stream of glucose while you sleep.
When You Can’t Treat It Yourself
If someone with low blood sugar becomes confused, loses consciousness, has a seizure, or can’t swallow safely, food is not the answer. Trying to feed someone who can’t swallow properly creates a choking risk. This is when glucagon, a prescription emergency medication, is needed. It signals the liver to release stored glucose into the bloodstream.
If you or someone in your household uses insulin or medications that can cause lows, having a glucagon kit on hand and making sure family members or roommates know how to use it is essential preparation.
If You Get Lows but Don’t Have Diabetes
Some people experience blood sugar drops a few hours after eating, a pattern called reactive hypoglycemia. The immediate treatment is the same: fast-acting carbs to bring levels back up. But the long-term management strategy focuses on preventing the drops in the first place.
The core approach is changing how and what you eat throughout the day. Eating smaller meals or snacks every two to four hours prevents the large swings in blood sugar that trigger reactive lows. Pairing carbohydrates with protein and healthy fat at every meal slows digestion and prevents the rapid spike that leads to an overcorrection and crash.
The best carbohydrate choices for preventing reactive lows are complex, high-fiber options that your body digests slowly: oatmeal, brown rice, quinoa, sweet potatoes with the skin, legumes like beans and lentils, and sprouted grain breads. These create a gradual rise and fall in blood sugar rather than a sharp spike. Pair them with lean protein (eggs, fish, chicken, tofu, cottage cheese) and healthy fats from olive oil, avocado, or nuts.
On the flip side, the foods most likely to trigger a reactive low are refined, simple carbohydrates: white bread, white rice, white pasta, pastries, pancakes, candy, sweetened drinks, and table sugar. These break down into glucose almost immediately, causing the kind of rapid spike that your body can overcorrect.