When your blood sugar drops below 70 mg/dL, you need 15 grams of fast-acting carbohydrates right away. That’s the immediate answer. But what you eat after that initial fix, and how you eat throughout the day, matters just as much for keeping your levels stable and preventing the next drop.
The 15-15 Rule for Immediate Treatment
The standard approach is simple: eat 15 grams of carbohydrate, then wait 15 minutes. If you don’t feel better after 15 minutes, eat another 15 grams. Check your blood sugar to confirm it’s back in a safe range.
Any of these provides roughly 15 grams of fast-acting carbs:
- 3 glucose tablets
- Half a cup (4 ounces) of fruit juice or regular soda
- 1 tablespoon of sugar or honey
- 6 or 7 hard candies
The key word is “fast-acting.” You want simple sugars that hit your bloodstream quickly. This is not the time for whole grains, high-fiber foods, or anything with a lot of fat or protein mixed in. Those slow digestion, which is normally a good thing, but not when you need glucose now. A candy bar, for instance, contains fat that delays absorption. Pure juice or glucose tablets work faster.
What to Eat After the Quick Fix
Once your blood sugar is back above 70, you’re not done. Fast-acting sugars spike your glucose quickly, but they also burn off quickly. Without a follow-up snack or meal, you risk dropping again within an hour or two.
This is where you want the opposite of what you just ate: something with complex carbohydrates paired with protein and a little fat. That combination slows digestion and creates a gradual, sustained rise in blood sugar instead of another spike and crash. A handful of nuts is one of the simplest options because most varieties deliver all three (carbs, protein, and fat) in a single food.
Other good follow-up combinations:
- Whole-grain crackers with peanut butter
- Greek yogurt with a piece of fruit
- A slice of whole wheat bread with turkey or cheese
- Cottage cheese with half a banana
- Hummus with half a pita
If your next full meal is more than an hour away, have one of these snacks. If you’re about to sit down for lunch or dinner anyway, just make sure it includes protein and complex carbs rather than being carb-heavy on its own.
Eating to Prevent Low Blood Sugar
If low blood sugar is a recurring problem, your overall eating pattern likely needs adjusting. The single most effective change is eating smaller, more frequent meals every 3 to 4 hours instead of relying on two or three large ones. If you’re actively having symptoms, eating every 2 hours may be necessary until things stabilize. Aim for 4 to 6 eating occasions per day.
Every time you eat, pair carbohydrates with protein. Carbs eaten alone, especially refined ones like white bread, sugary cereal, or pastries, cause a rapid blood sugar spike followed by a rapid fall. Adding protein and fat slows that whole process down. Think of it as putting a speed limit on digestion.
The types of carbohydrates matter too. Low glycemic index foods are digested and absorbed over a longer period, which means steadier blood sugar. Good choices include:
- Oatmeal, quinoa, brown rice, or barley
- Sweet potatoes (with the skin)
- Beans, lentils, and chickpeas
- Sprouted grain or whole wheat bread
- Most fruits and green vegetables
Beans and lentils deserve special mention because they’re both a complex carbohydrate and a protein source. They’re one of the best foods for keeping blood sugar level over several hours. Eggs, lean meat, fish, tofu, and low-fat dairy are all solid protein options to build meals around.
Sweets and High-Sugar Foods
You don’t have to eliminate sugar entirely, but eating concentrated sweets on their own is one of the fastest routes to a blood sugar crash. A pastry by itself for breakfast, a large glass of juice without food, or candy as an afternoon snack can trigger the exact spike-and-drop pattern that causes hypoglycemia symptoms.
If you want something sweet, have it as part of a balanced meal or snack rather than alone. A cookie after a lunch that included chicken and vegetables will affect your blood sugar very differently than that same cookie eaten on an empty stomach at 3 p.m.
Bedtime Snacks to Prevent Overnight Drops
Blood sugar can fall during sleep, and you obviously can’t eat while you’re unconscious. Research has found that bedtime snacks combining carbohydrate, protein, and fat work best for preventing overnight lows, particularly when blood sugar is below 130 mg/dL at bedtime.
Aim for 15 to 30 grams of carbohydrate plus a serving of protein. Some practical options:
- Half a cup of oatmeal with raisins and milk
- 6 whole-grain crackers with peanut butter
- A half sandwich on whole wheat bread with turkey, ham, or cheese
- Half a cup of yogurt with a couple of graham cracker squares
- A small whole wheat bagel with nut butter
- A quarter cup of hummus with half a pita
These snacks all land in the 15 to 20 gram carbohydrate range, which is enough to sustain your glucose levels through the night without spiking them before bed.
When Food Isn’t Enough
Severe low blood sugar, below 54 mg/dL, is a medical emergency. If you’re too confused to treat yourself, feel like you might pass out, or can’t swallow safely, you need glucagon (a prescription medication that raises blood sugar rapidly) or emergency help. The 15-15 rule only works when you’re alert enough to eat and swallow. Anyone who uses insulin or medications that lower blood sugar should have a plan in place for these situations, and the people around them should know what to do.