When your blood sugar drops below 70 mg/dL, you need fast-acting carbohydrates immediately: 15 grams worth. That translates to about 4 ounces of fruit juice, a tablespoon of honey, or 3 to 4 glucose tablets. After eating, wait 15 minutes and check again. If you’re still below 70 mg/dL, repeat with another 15 grams. This is called the 15-15 rule, and it’s the standard approach recommended by diabetes organizations and emergency guidelines alike.
But treating a low in the moment is only half the picture. What you eat in the hours and days around those episodes matters just as much for keeping your levels stable. Here’s a full breakdown of what to reach for and when.
Fast-Acting Foods for an Immediate Low
The goal during an active episode is speed. You want sugar that hits your bloodstream quickly, without fat or fiber slowing it down. Each of these provides roughly 15 grams of fast-acting carbohydrates:
- Fruit juice: 4 ounces (half a cup) of orange or apple juice
- Regular soda: 4 ounces of non-diet soda
- Honey: 1 tablespoon
- Glucose tablets: 3 to 4 tablets (check the label, as brands vary)
- Hard candy: about 4 to 5 pieces of something like Lifesavers
- Table sugar: 1 tablespoon dissolved in water
Avoid reaching for chocolate, peanut butter cups, or ice cream during an active low. The fat in those foods delays sugar absorption, which is the opposite of what you need when your levels are dropping. Save the more complex foods for after you’ve stabilized.
What to Eat After Your Levels Recover
Once your blood sugar climbs back above 70 mg/dL, the fast-acting sugar you just consumed will burn off quickly. Without a follow-up snack, you risk crashing again within an hour or two. This is where a combination of complex carbohydrates, protein, and a little healthy fat becomes important. Together, these three slow down digestion and give your body a steadier supply of glucose over the next few hours.
Good follow-up snacks include:
- Peanut butter on whole-grain toast: the bread provides slower-releasing carbs, and the peanut butter adds protein and fat
- A handful of nuts: almonds, walnuts, or cashews deliver protein, fat, and some carbohydrates all at once
- Cheese and crackers: whole-grain crackers with a slice or two of cheese
- Greek yogurt with fruit: the yogurt adds protein while the fruit provides carbs
- A hard-boiled egg with a piece of fruit: simple to prepare ahead of time and easy to grab
If you’re close to a regular mealtime, eating that meal is fine as your follow-up. Just make sure it includes protein and isn’t purely carbohydrate-based.
Eating to Prevent Lows From Happening
If you experience low blood sugar regularly, particularly the reactive kind that strikes a few hours after eating, your overall eating pattern is worth examining. The most effective dietary approach is building every meal and snack around three components: complex carbohydrates, protein, and healthy fat. This combination prevents the sharp spike-and-crash cycle that triggers reactive episodes.
Complex carbohydrates are the slow-burning kind. Foods like beans, lentils, chickpeas, whole grains, and most vegetables rank low on the glycemic index (55 or below on a 0-to-100 scale), meaning they raise blood sugar gradually rather than all at once. Green vegetables, raw carrots, and most fruits also fall into this category. Pairing them with protein slows digestion even further. Good protein sources include lean meat, fish, eggs, tofu, cottage cheese, Greek yogurt, and beans (which pull double duty as both complex carbs and protein).
Eating smaller meals more frequently throughout the day, rather than three large ones spaced far apart, also helps. Long gaps between meals are one of the most common triggers for blood sugar dips, especially if your previous meal was carb-heavy without much protein or fat to anchor it.
Bedtime Snacks to Prevent Overnight Lows
Nocturnal hypoglycemia is a particular concern if you take insulin or other glucose-lowering medications. Your body still uses glucose while you sleep, and without food intake for 7 to 8 hours, levels can drift too low. A small bedtime snack high in protein or fiber can provide a slow, steady glucose release through the night.
Effective bedtime options include a tablespoon of peanut butter with celery, a hard-boiled egg, a light cheese stick, or a small bowl of air-popped popcorn. These are all low-calorie, low-carbohydrate choices that emphasize protein and fiber over sugar. The goal isn’t to raise your blood sugar significantly before bed. It’s to give your body something to work with while you sleep so levels don’t bottom out at 3 a.m.
How to Recognize a Low Before It Gets Serious
Knowing what to eat matters less if you don’t catch the drop early. The first signs are driven by your body’s stress response: trembling, sweating, a pounding heart, sudden anxiety, and intense hunger. These symptoms are your body’s alarm system telling you to eat something now.
If the drop continues, a second wave of symptoms appears as your brain starts running short on fuel: confusion, difficulty concentrating, weakness, drowsiness, blurred vision, slurred speech, and dizziness. By this stage, treating yourself becomes harder because your judgment and coordination are impaired.
If someone with low blood sugar can’t swallow safely, becomes unconscious, or doesn’t improve after two rounds of the 15-15 rule, the situation has moved beyond what food can fix. Glucagon (a hormone that rapidly raises blood sugar) is the appropriate treatment at that point, and calling 911 is warranted if glucagon isn’t available or the person doesn’t respond.
What to Keep on Hand
If you’re prone to lows, preparation makes all the difference. Keep glucose tablets or a small juice box in your bag, your car, your desk at work, and your nightstand. These are more reliable than hoping you’ll find something suitable nearby when your hands are shaking and your thinking is foggy. Glucose tablets in particular have a long shelf life, don’t melt, and deliver a precise dose.
For your kitchen, stock foods that serve both roles: fast-acting options like juice and honey for acute episodes, and protein-rich staples like nuts, eggs, cheese, and nut butter for the follow-up and for daily prevention. Having both categories within easy reach turns an episode from a scary scramble into a manageable, almost routine correction.