Blood sugar (blood glucose) is the main fuel your body runs on. After you eat, glucose rises; your pancreas releases insulin, which helps move that glucose into your cells, and levels settle again. When that system works well, your numbers stay in a fairly narrow range all day. When it starts to struggle, readings creep higher, often for years before anything feels wrong.
That's why it helps to know what your numbers mean. Here are the standard ranges, explained simply.
The three main blood sugar tests
- Fasting plasma glucose: measured after at least 8 hours without food, usually first thing in the morning.
- A1C (HbA1c): shows your average blood sugar over the past 2 to 3 months. No fasting needed.
- 2-hour glucose (oral glucose tolerance test): measured 2 hours after drinking a standard sugar drink in a lab.
Blood sugar chart: normal, prediabetes and diabetes
These are the diagnostic ranges used by the American Diabetes Association and Diabetes Canada for adults:
| Test | Normal | Prediabetes | Diabetes |
|---|---|---|---|
| Fasting glucose | Below 100 mg/dL (below 5.6 mmol/L) |
100–125 mg/dL (5.6–6.9 mmol/L) |
126 mg/dL or higher (7.0 mmol/L or higher) |
| A1C | Below 5.7% | 5.7–6.4% | 6.5% or higher |
| 2-hour glucose test | Below 140 mg/dL (below 7.8 mmol/L) |
140–199 mg/dL (7.8–11.0 mmol/L) |
200 mg/dL or higher (11.1 mmol/L or higher) |
Note that Diabetes Canada places the start of prediabetes on the A1C test at 6.0% rather than 5.7%. A single result is never a diagnosis; your doctor will confirm with repeat testing.
What about blood sugar after meals?
In people without diabetes, blood sugar typically peaks within an hour or so of eating and returns close to the fasting level within 2 to 3 hours. For most healthy adults, readings 2 hours after a meal stay below about 140 mg/dL (7.8 mmol/L). Large spikes after meals, followed by energy crashes, cravings and an afternoon slump, are a common sign that a meal was heavy in fast-digesting carbohydrates.
Why prediabetes deserves attention
Prediabetes is very common: about one in three American adults has it, and most don't know. It usually has no symptoms. The encouraging part is that it is often reversible. In the landmark Diabetes Prevention Program, people with prediabetes who lost about 7% of their body weight and walked roughly 150 minutes a week cut their risk of developing type 2 diabetes by more than half.
Common risk factors
- Age over 40
- Family history of type 2 diabetes
- Extra weight, especially around the waist
- Low physical activity
- History of gestational diabetes
- High blood pressure or abnormal cholesterol
- Short or poor-quality sleep
Everyday habits that support healthy blood sugar
- Walk after meals. Even 10 to 15 minutes of light walking after eating helps your muscles take up glucose and blunts the after-meal rise.
- Build plates around fibre and protein. Vegetables, legumes, whole grains and a palm-sized portion of protein slow digestion and soften spikes.
- Swap sugary drinks for water. Liquid sugar hits the bloodstream fastest of all.
- Strength-train twice a week. Muscle is your largest store for glucose; more of it means better blood sugar control.
- Protect your sleep. Even a few nights of short sleep can make your body less sensitive to insulin.
- Know your numbers. Ask your doctor for a fasting glucose or A1C test at your next check-up, especially if any risk factors apply to you.
Looking for natural blood sugar support? Naavudi is a practitioner-formulated herbal supplement that combines nine traditional Ayurvedic herbs, including bitter melon, fenugreek, gurmar, Java plum and holy basil, with our fulvic mineral extract. It is designed to support healthy blood sugar levels as part of a balanced diet and active lifestyle, and has been made in Canada since 2009.
This article is general information, not medical advice. If you have diabetes or take medication that lowers blood sugar, talk to your doctor or pharmacist before starting any supplement, and never stop or change a prescribed medication without medical advice.