When your blood sugar drops below 70 mg/dL, you need 15 grams of fast-acting carbohydrates immediately. That means simple sugar, not a sandwich or a protein bar. The goal is to get glucose into your bloodstream as quickly as possible, then follow up with a more substantial snack to keep your levels stable.
The 15-15 Rule
The standard approach to treating low blood sugar is simple: eat 15 grams of fast-acting carbs, wait 15 minutes, then check your blood sugar again. If it’s still below 70 mg/dL, repeat with another 15 grams. This prevents you from overcorrecting and spiking your blood sugar too high in the other direction, which is a common mistake when people feel shaky and reach for everything in the pantry.
Each of the following provides roughly 15 grams of fast-acting carbohydrates:
- Glucose tablets: 3 tablets (the most precise option)
- Fruit juice: half a cup (4 ounces)
- Regular soda: half a cup (4 ounces), not diet
- Honey: 1 tablespoon
- Hard candy: 4 to 5 pieces (check the label)
- Table sugar: 1 tablespoon dissolved in water
Liquids like juice and soda tend to raise blood sugar slightly faster than solid foods because they move through your digestive system more quickly. Solids like candy produce a more gradual, phased response. When you’re feeling genuinely unwell, juice or glucose tablets are your best bet.
What Not to Eat During a Low
Your instinct might be to grab peanut butter crackers or a chocolate bar, but foods containing fat, protein, or fiber slow down digestion significantly. Fat delays glucose absorption, and protein foods like cheese or nuts can take three to four hours to fully digest. That delay works against you when your blood sugar needs to come up fast.
Save those foods for the next step. During the acute low, stick to pure, simple sugar with as little fat and fiber as possible. That means regular soda, not milk. Juice, not a smoothie. Candy, not chocolate (which is high in fat).
The Follow-Up Snack
Once your blood sugar is back above 70 mg/dL, you’re not done. Fast-acting sugar burns through quickly, and without a follow-up, your levels can drop again within an hour or two. This is where protein, healthy fat, and complex carbohydrates come in. Pairing all three slows digestion and creates a steadier release of glucose, preventing another crash.
Good follow-up snacks include:
- Nuts: almonds, walnuts, or cashews deliver carbs, protein, and fat in one handful
- Toast with peanut butter: sprouted grain or whole wheat bread with a tablespoon of nut butter
- Greek yogurt: high in protein with enough carbs to sustain you
- Cheese and whole grain crackers: a simple combo of protein, fat, and complex carbs
- Cottage cheese with fruit: protein plus natural sugars and fiber
- Half a sandwich: whole grain bread with lean meat, egg, or cheese
If it’s close to a regular mealtime, eating your meal serves the same purpose. The key is not leaving a gap where your blood sugar has nothing to run on after the initial sugar wears off.
How Low Blood Sugar Levels Are Classified
Not all lows are the same. A reading between 54 and 69 mg/dL is considered a mild low (level 1). You’ll likely feel shaky, sweaty, or hungry, and the 15-15 rule is the right response. Below 54 mg/dL is a more serious low (level 2), where symptoms intensify and you may feel confused, dizzy, or have blurred vision. The same treatment applies, but you need to act faster and may need to repeat the 15-gram dose more than once.
A level 3 low is a medical emergency. This is when someone becomes so confused, drowsy, or unresponsive that they can’t safely eat or drink on their own. At this point, food is not a safe treatment because of the choking risk. This situation calls for injectable or nasal glucagon and emergency help from someone nearby.
Eating Patterns That Prevent Drops
If low blood sugar is a recurring problem, what you eat between episodes matters just as much as what you eat during one. Small meals or snacks every three hours help maintain a steadier supply of glucose throughout the day. The goal is to avoid long stretches without eating, which is when drops are most likely to happen.
Build meals around complex carbohydrates: oatmeal, brown rice, quinoa, sweet potatoes with the skin on, beans, and lentils. These break down slowly and release glucose gradually instead of all at once. Pair them with a protein source like eggs, fish, lean meat, tofu, or cottage cheese to slow digestion even further.
Avoid eating sugary foods or refined carbs like white bread and white pasta on an empty stomach. These cause a rapid spike in blood sugar followed by a sharp drop, which is exactly the pattern you’re trying to prevent. If you drink alcohol, always eat something alongside it, since alcohol can interfere with your liver’s ability to release stored glucose.
Regular physical activity also helps your body regulate blood sugar more effectively over time, though you should be aware that exercise itself can sometimes trigger a low if you haven’t eaten enough beforehand. Keeping a small snack or glucose tablets with you during workouts is a practical safeguard.