Safety basics
Signs of Low Blood Sugar and What the 15-15 Rule Means
The signs of low blood sugar include shakiness, sweating, hunger, dizziness, confusion and a fast heartbeat. For many people with diabetes, a low means a reading under 70 mg/dL. The usual fix is the 15-15 rule: eat 15 to 20 grams of fast carbohydrate, then recheck in 15 minutes.
Written by the Glyco Defender facts deskUpdated · 4 min read
Early warning01
What are the signs of low blood sugar?
The signs of low blood sugar are shakiness, sweating, hunger, dizziness, confusion and a fast heartbeat (NIDDK, Low Blood Glucose). They tend to come on quickly.
Low blood sugar is also called hypoglycemia. It happens when the sugar in your blood drops below what your body and brain need to run.
Not everyone feels the same warning. Some people get a pounding heart first. Others notice only a foggy head or a sudden temper. Learn your own first sign.
Body signs
Shaking, sweating, a racing pulse, hunger and dizziness.
Mind signs
Trouble thinking, confusion, blurred focus and irritability.
Severe signs
Seizures or passing out. These are an emergency.
The numbers02
What blood sugar number counts as low?
For many people with diabetes, a blood sugar number below 70 mg/dL counts as low (NIDDK, Low Blood Glucose). Your own target may differ, so ask your care team.
The ranges below are for diagnosis, and they are a different job from spotting a low. A low is judged against your own treatment plan.
Use the finder to see where a fasting reading sits on the NIDDK ranges (NIDDK, Diabetes & Prediabetes Tests).
- NormalA1C below 5.7%Fasting below 100 mg/dL
- PrediabetesA1C 5.7-6.4%Fasting 100-125 mg/dL
- Diabetes rangeA1C 6.5% or higherFasting 126 mg/dL or higher
Type an A1C or a fasting number to see its range. One test is not a diagnosis; a doctor confirms with a repeat test.
Ranges from NIDDK (NIDDK, Diabetes & Prediabetes Tests). About 115.2 million U.S. adults have prediabetes, and many do not know it (CDC, National Diabetes Statistics Report). A home meter is not a diagnostic test.
| Item | Fact |
|---|---|
| Usual low line | Under 70 mg/dL for many people with diabetes |
| Fast carbs to eat | 15 to 20 grams |
| Recheck after | 15 minutes |
| Medicines linked to lows | Insulin, sulfonylureas, meglitinides |
The 15-15 rule03
How does the 15-15 rule treat a low?
The 15-15 rule means eating 15 to 20 grams of fast carbohydrate, waiting 15 minutes, then checking again (NIDDK, Low Blood Glucose). Repeat if the reading is still low.
Fast carbohydrate is sugar that reaches the blood quickly. Fat and protein slow it down, so skip them during a low.
Check the number
Use your meter if you have one. If you cannot check, treat anyway when signs are clear.
Eat 15 to 20 grams of fast carbs
Glucose tablets or juice work. A hard candy handful can also do it.
Wait 15 minutes
Sit down and recheck.
Repeat or eat a snack
If the number is still low, treat again. Once it rises, a small meal keeps it steady.
One worked example: a juice box of about 15 grams, then a recheck at the 15-minute mark.
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See packsWhen to get help04
When is low blood sugar an emergency?
Low blood sugar is an emergency when a person passes out, has a seizure or cannot safely swallow (NIDDK, Low Blood Glucose). Call 911 right away.
Do not give food or drink to someone who cannot swallow safely. Stay with them until help arrives.
The person is unconscious, having a seizure or too confused to swallow. Do not wait to see if it passes.
Frequent lows deserve a call to your doctor, even when you fix each one. Lows can come from medicine doses, skipped meals or extra exercise.
Supplements05
Can a supplement cause or prevent a low?
A supplement does not prevent a low, and some can add to the drop when taken with diabetes drugs (ADA, Vitamins & Supplements). Chromium is one example (NIH ODS, Chromium).
Keep taking your prescribed medicine and tell your doctor about every supplement. Glyco Defender is a dietary supplement in drops, with 7 mcg of chromium per dropperful. It is not a treatment for lows or for diabetes.
Read the full side effects guide and the supplements and diabetes medicines guide before you order. A walk through a morning routine shows how habits fit around meals.
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Glyco Defender is a dietary supplement, not a treatment. Ask your doctor or pharmacist first if you use insulin, a sulfonylurea or another glucose-lowering drug, a blood thinner, blood pressure or heart-rhythm medicine, an antidepressant or thyroid medicine. Chromium, gymnema and ginseng may add to diabetes medicines and cause lows; guarana and green tea add caffeine. Keep taking prescribed medicine. See side effects and interactions.
FAQ06
Glyco Defender questions people ask
What does a low blood sugar feel like at night?
Night lows bring the same signs as daytime ones, such as sweating and a pounding heart (NIDDK, Low Blood Glucose). Some people sleep through them. If you suspect this keeps happening, tell your doctor and ask whether a bedtime check makes sense.
Can you have low blood sugar without diabetes?
Yes, it can happen without diabetes, though it is much less common. Causes include long gaps between meals, heavy alcohol use and some illnesses. Ongoing signs need a doctor, who can test the cause instead of guessing.
What is the best quick snack for a low reading?
Pick something that is mostly sugar and low in fat, such as glucose tablets or fruit juice, in an amount near 15 to 20 grams of carbohydrate (NIDDK, Low Blood Glucose). Chocolate and nuts work slowly, so save them for after the number rises.
Is shaking after coffee the same as low blood sugar?
Not always. Caffeine alone can cause shaky hands and a fast pulse (FDA, Caffeine: how much is too much?). If you have diabetes, check your meter before assuming either cause, and treat a true low first.
Who wrote this07
Written and reviewed by
Pages built from the label, the sales page and linked NIH, FDA, CDC, FTC and peer-reviewed sources.
Last updated . Learn about our editorial standards and how we check reviews. This website is run by a U.S. stocking partner for Glyco Defender, not by the manufacturer or the distributor. We are paid when you buy through our order links.
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