What is a normal blood sugar after eating?
Below 7.8 two hours after the lab’s sugar drink, if you don’t have diabetes and aren’t pregnant. Meals aren’t tested the same way. Yet healthy people still spend about 30 minutes a day above it.
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What is a normal blood sugar level after eating?
Without diabetes, the usual line is below 7.8 mmol/L two hours after a sugar drink. That’s the oral glucose tolerance test (OGTT). A lab uses it when other sugar tests aren’t clear.
From 7.8 up to 11.1, the lab calls it impaired glucose tolerance: higher than normal, but not in the diabetes range. At 11.1 or more, it’s in the diabetes range.
- Below 7.8 mmol/LNon-diabetic.
- 7.8 to just under 11.1 mmol/LImpaired glucose tolerance.
- 11.1 mmol/L or aboveDiabetes range.
Source: NHS pathology (WHO criteria)
No symptoms? One result in the diabetes range isn’t enough. The lab needs a second one on another day.
Pregnant? The line is the same 7.8, but at 7.8 or more NICE says it’s gestational diabetes (high blood sugar that starts in pregnancy).
In the middle band? Ask your GP how eating well and exercise can help prevent type 2 diabetes.
Is 8.2 blood sugar after eating normal?
It can be. In a US study, 153 healthy people without diabetes or obesity wore a sugar sensor for up to 10 days.
| Measure | Typical result |
|---|---|
| Average sugar, age 60 and under | 5.4 to 5.5 mmol/L |
| Average sugar, over 60 | 5.8 mmol/L |
| Time between 3.9 and 7.8 | 96% of the day |
| Time above 7.8 | About 30 minutes a day |
| Time below 3.9 | About 15 minutes a day |
Source: Shah et al, 2019
That half hour is the twist. Short spells above 7.8 showed up even in healthy people. Diabetes UK says sugar goes up and down through the day, and swings more with diabetes.
So one reading is a photo, not a film. It shows that moment, not how your sugar behaves day to day.
A home meter isn’t the lab test either. Diabetes UK says sensors bought without diabetes can’t diagnose diabetes or prediabetes (sugar higher than normal, but not high enough for diabetes). Only blood tests can, and your GP can arrange them.
But 8.2 two hours into the lab’s sugar drink test is different. If you’re not pregnant, it sits in the impaired glucose tolerance band. In pregnancy, it counts as gestational diabetes.
Worried about a home reading? Ask your GP about a blood test.
What should blood sugar be after eating with diabetes?
It depends on your type of diabetes, and whether you’re pregnant.
| Who | After meals (mmol/L) | When to check |
|---|---|---|
| Adult with type 1 | 5 to 9 | At least 90 minutes after eating |
| Child with type 1 | 5 to 9 | After meals |
| Type 2 | No NICE figure | Agree yours with your care team |
| Pregnant, any diabetes | Below 7.8, or below 6.4 | 1 hour after, or 2 hours after |
| Any diabetes, home test | Over 11 is high | At least 90 minutes after eating |
Sources: Diabetes UK; NICE NG3; NHS
Your own aim may differ. Diabetes UK says your care team will agree it with you.
A high reading now and then? The NHS says it’s not usually a serious problem if your sugar is sometimes slightly high for a short time. Staying high, or getting very high, is.
Before-meal levels and hypos (when sugar drops too low) are in our guide to diabetic blood sugar levels. Not sure of your after-meal aim? Ask at your next diabetes review.
How can I lower my blood sugar after a meal?
Walk after you eat. A trial in 41 adults with type 2 diabetes compared two kinds of advice. Advice to walk for 10 minutes after each main meal beat advice to walk 30 minutes a day.
Their sugar rise over the 3 hours after meals was 12% lower. After the evening meal, it was 22% lower.
Short walks beat sitting too. A review of 7 one-day trials, mostly in adults with overweight or obesity, found light walking breaks lowered sugar after meals more than sitting on.
Six ways to keep sugar down after meals
- Walk for 10 minutes after each main meal.
- Break up long spells of sitting with a short, gentle walk.
- Avoid eating too much sugary or starchy food.
- Exercise regularly.
- Lose weight if you’re overweight.
- Take any diabetes medicine you’ve been prescribed, as advised.
Sources: Reynolds et al, 2016; Sports Medicine review, 2022; NHS: high blood sugar
The last four are NHS tips for people with diabetes. Never stop or change a prescribed medicine without your prescriber.
Pick one meal to start, such as the evening one. More in walking after meals and our type 2 diabetes food list.
Do I need a blood sugar test?
If you have symptoms or a higher risk, the NHS says see a GP. The NHS says not everyone with type 2 diabetes has symptoms, so it’s important to get checked.
How a blood sugar check usually goes
- 1
See your GP
If you have symptoms or a higher risk.
- 2
Blood test
Checks how high your sugar is. Results usually take a few days.
- 3
Sugar drink test
Sometimes, if other results aren’t clear.
- 4
Next steps
Prediabetes or diabetes means a plan with your care team.
Sources: NHS; NHS pathology
Prediabetes means your sugar is higher than normal, but not high enough for diabetes. It also means a higher risk of diabetes later.
Aged 40 to 74 with no existing health condition? Ask your GP surgery or pharmacy for a free NHS Health Check.
Ask your GP which test is right for you. See what each test shows: HbA1c, fasting glucose and prediabetes tests.
When to speak to a GP
Book an appointment if:
- You feel very tired, pee more than usual, feel thirsty all the time or lose weight without trying. These are common signs of type 2 diabetes.
- You have blurred vision, cuts that are slow to heal, or itching around your penis or vagina, or keep getting thrush.
- You’re white and over 40, or over 25 and South Asian, Chinese, Black African or Black Caribbean.
- A parent, brother or sister has type 2 diabetes, you’re overweight and not very active, or you have high blood pressure.
- You have diabetes and you’ve tried to lower your sugar, but it’s still high or you still have symptoms.
Call 999 or go to A&E if you think your sugar is high and you’re feeling or being sick, or have stomach pain.
The same goes for fast breathing or heartbeat, or feeling drowsy or struggling to stay awake. Or fruity breath (like pear drop sweets), confusion or trouble concentrating.
Or a high level of ketones in your blood or pee, a sign of a serious problem called diabetic ketoacidosis. Don’t drive yourself to A&E.