Low blood sugar, or hypoglycemia, happens when your blood glucose drops below 70 mg/dL. Combating it requires both an immediate response to bring your levels back up and longer-term strategies to prevent it from happening repeatedly. The approach differs depending on whether you’re treating a drop that’s already happening or trying to stop future episodes.
Recognizing the Warning Signs
Your body sends two distinct waves of symptoms as blood sugar falls. The first wave comes from your nervous system reacting to the drop: shakiness, sweating, a racing heartbeat, sudden hunger, anxiety, and pale skin. These are your early warning signals, and acting on them quickly prevents things from getting worse.
If blood sugar continues to fall, the second wave hits your brain directly. This is when confusion, unusual behavior changes, fatigue, difficulty concentrating, and agitation set in. At very low levels (below 54 mg/dL), you may feel faint or weak and struggle to care for yourself. Recognizing the early symptoms and responding immediately is the single most important thing you can do.
The 15-15 Rule for Immediate Treatment
The standard treatment for a low blood sugar episode is simple: eat 15 grams of fast-acting carbohydrates, 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 will give you 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, honey, or syrup
- 6 or 7 hard candies
- 1 cup of a sports drink
- 15 grapes or 1 cup of melon cubes
Glucose tablets are the most predictable option because they contain a precise amount of sugar and nothing else to slow absorption. Juice and regular soda work well too. Avoid chocolate, cookies, or ice cream as your first response. Their fat content slows digestion and delays the sugar from reaching your bloodstream when you need it fast.
When Someone Needs Emergency Help
Severe hypoglycemia is when blood sugar drops below 54 mg/dL or when the person becomes too confused, weak, or unconscious to eat or drink on their own. In these situations, trying to feed someone who can’t swallow safely is dangerous.
This is where emergency glucagon comes in. Glucagon is a hormone that signals the liver to release stored sugar into the bloodstream, and it’s available in several forms that don’t require medical training to use. Nasal spray versions (sold as BAQSIMI) deliver a powder into the nose, similar to any nasal spray. Auto-injector pens work like an EpiPen, delivering the medication under the skin of the arm, belly, or thigh. If someone with diabetes is at risk for severe lows, they should have one of these kits accessible, and the people around them should know where it is and how to use it.
If a person loses consciousness, give the glucagon treatment immediately and call emergency services.
Preventing Drops With the Right Foods
If you experience repeated blood sugar drops, especially the kind that happen a few hours after eating (called reactive hypoglycemia), your diet is the most powerful tool for prevention. The core strategy is replacing foods that spike your blood sugar quickly with ones that raise it gradually.
Simple carbohydrates like white bread, white rice, white pasta, pastries, pancakes, candy, and sweetened drinks break down into sugar almost immediately. Your body may overreact with too much insulin, causing blood sugar to crash a couple of hours later. Cutting back on these foods reduces the frequency of those crashes significantly.
Replace them with complex carbohydrates that are higher in fiber: brown or wild rice, quinoa, oatmeal, sweet potatoes with the skin on, barley, sprouted grain breads, and legumes like beans, lentils, and split peas. These create a slower, steadier rise and fall in blood sugar instead of a sharp spike followed by a drop.
Pairing carbohydrates with protein and healthy fat at every meal slows digestion even further. Add lean meat, fish, eggs, Greek yogurt, cottage cheese, nuts, or tofu alongside your carbs. Cook with extra virgin olive oil or avocado oil. A meal that combines all three, like oatmeal topped with nuts and seeds, or beans with brown rice and vegetables cooked in olive oil, keeps blood sugar far more stable than carbohydrates eaten alone. Load up on non-starchy vegetables like broccoli, Brussels sprouts, cabbage, and cauliflower, which are high in fiber and have minimal impact on blood sugar.
Meal Timing Matters
Going too long without eating is one of the most common triggers for low blood sugar. Eating smaller meals or snacks every two to four hours prevents the long gaps that allow blood sugar to drift downward. This is especially important if you take insulin or medications that stimulate insulin production, but it applies to anyone prone to reactive lows as well.
If you drink alcohol, always eat something alongside it rather than drinking on an empty stomach. Alcohol interferes with your liver’s ability to release stored sugar, which can lead to unexpected drops, sometimes hours after your last drink.
Managing Lows During Exercise
Physical activity lowers blood sugar, which is normally a good thing, but it can tip into hypoglycemia if you take insulin or certain oral diabetes medications. The American Diabetes Association recommends checking your blood sugar before any physical activity. If it’s on the lower side, eating a small snack beforehand can prevent a drop during your workout.
For longer exercise sessions, you may need both a snack and an adjustment to your medication dose. This is something to work out with your healthcare provider based on the type and duration of activity you’re doing, since the effect varies widely between a 20-minute walk and a two-hour bike ride.
Preventing Overnight Lows
Nocturnal hypoglycemia, where blood sugar drops while you’re asleep, can be particularly dangerous because you may sleep through the warning symptoms. Signs include waking up with a headache, feeling unrested, or finding your sheets damp with sweat.
If you take insulin or other diabetes medications, a bedtime snack that combines complex carbohydrates with protein or fat can help maintain stable blood sugar through the night. If nighttime lows happen frequently, it often means your medication dose needs adjusting rather than simply adding more food before bed. A continuous glucose monitor can also alert you to drops overnight, catching them before they become severe.