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 between episodes matters just as much for keeping your levels stable throughout the day. The right combination of foods can prevent drops before they happen.
What to Eat Right Now: The 15-15 Rule
If you’re feeling shaky, sweaty, dizzy, or confused, eat 15 grams of simple carbohydrates and wait 15 minutes. Then check your blood sugar again. If it’s still below 70 mg/dL, repeat with another 15 grams.
Good options for that quick 15 grams include:
- Glucose tablets: 4 tablets (the fastest, most predictable option)
- Fruit juice: about 4 ounces (half a cup)
- Regular soda: about 4 ounces (not diet)
- Hard candies: 4 to 5 pieces, depending on size
- Honey or table sugar: 1 tablespoon
One important thing to avoid: don’t reach for chocolate, peanut butter crackers, or ice cream during an active low. Foods high in fat or protein slow down how quickly glucose gets into your bloodstream, which is the opposite of what you need in that moment. Pure glucose works best because your body can absorb it almost immediately. Protein can actually increase insulin secretion, which could make things worse rather than better.
Once your blood sugar comes back up, follow the fast carbs with a small balanced meal or snack. This prevents another crash 30 to 60 minutes later.
Eating to Prevent Drops Throughout the Day
If low blood sugar is a recurring problem, the pattern of what and when you eat makes a significant difference. The core strategy is eating every 3 to 4 hours and never letting long gaps pass without food. If you’re actively experiencing frequent symptoms, eating every 2 hours may be necessary until things stabilize. Aim for 4 to 6 eating occasions per day, counting both meals and snacks.
Every time you eat, pair carbohydrates with protein and some fat. This combination slows digestion and creates a more gradual release of glucose into your blood instead of a sharp spike followed by a crash. A piece of fruit alone, for example, will raise your blood sugar quickly but drop off fast. That same piece of fruit with a handful of nuts or a slice of cheese gives you a longer, steadier curve.
If your blood sugar tends to dip around the same time most days, plan a snack just before that window. Tracking when your lows happen can reveal patterns you can get ahead of.
Best Foods for Steady Blood Sugar
Foods with a low glycemic index (GI of 55 or below) release glucose slowly and help prevent the rapid spikes and crashes that trigger reactive lows. These include green vegetables, most fruits, raw carrots, kidney beans, chickpeas, and lentils. Medium-GI foods like oats, bananas, sweet corn, and whole-grain bread are also reasonable choices, especially when paired with protein.
Foods to be cautious with on their own: white rice, white bread, and potatoes. These are high-GI foods that can send blood sugar up fast, then bring it crashing down. That doesn’t mean you can never eat them. It means eating them as part of a balanced meal with protein, fat, and fiber rather than by themselves.
Soluble fiber deserves special attention. It dissolves in water and forms a gel-like substance in your stomach that slows digestion and smooths out blood sugar response. Good sources include apples, oats, peas, black beans, lima beans, Brussels sprouts, and avocados. The current dietary guidelines recommend 22 to 34 grams of total fiber per day, depending on your age and sex. Most people fall well short of that.
Practical Meal and Snack Ideas
For meals, think in threes: a fiber-rich carbohydrate, a lean protein, and a healthy fat. Oatmeal with walnuts and a boiled egg. A lentil soup with whole-grain bread. Grilled chicken over a salad with chickpeas and avocado. These combinations keep glucose entering your bloodstream at a steady pace rather than all at once.
For snacks between meals, the same principle applies on a smaller scale: apple slices with peanut butter, cheese with whole-grain crackers, Greek yogurt with berries, or hummus with raw vegetables. Each of these pairs carbohydrates with protein or fat to slow absorption.
What to Eat Before Bed
Overnight lows are common and can be dangerous because you’re asleep and may not notice symptoms. A bedtime snack can prevent them, but the type of snack matters depending on where your blood sugar is at that point.
A study in adults with type 1 diabetes found that most overnight low episodes (71%) happened on nights when no bedtime snack was eaten at all. A standard snack containing both carbohydrates and protein eliminated nocturnal lows completely, even when bedtime blood sugar was on the lower side. When bedtime glucose was already elevated (above 180 mg/dL), no snack was necessary.
A good bedtime snack includes carbohydrate, protein, fat, and fiber. Think a small bowl of whole-grain cereal with milk, toast with peanut butter, or crackers with cheese and a few slices of apple. The goal is slow, sustained digestion that keeps glucose trickling into your blood through the night.
Foods and Habits That Make Lows Worse
Concentrated sweets eaten by themselves are one of the biggest triggers for reactive blood sugar drops. A candy bar or a glass of juice on an empty stomach can spike your glucose rapidly, prompting your body to release a surge of insulin that overshoots and drives blood sugar too low. If you eat sweets, have them as part of a meal rather than on their own.
Skipping meals is the other major culprit. Going five or six hours without eating while your body (or your diabetes medication) continues pulling glucose from your blood is a reliable recipe for a low. Alcohol on an empty stomach can also suppress your liver’s ability to release stored glucose, making lows more likely and harder to recover from.
Caffeine affects people differently, but in some cases it can mask early warning signs of a low or contribute to blood sugar instability. If you notice a pattern, it’s worth paying attention to timing and quantity.
Quick Reference: Treat vs. Prevent
- To treat a low right now: 15 grams of fast-acting carbs (juice, glucose tablets, regular soda). Avoid fatty foods. Recheck in 15 minutes.
- To prevent future lows: Eat every 3 to 4 hours. Always pair carbs with protein and fat. Choose low-GI, high-fiber foods. Have a balanced bedtime snack.