Blood sugar after eating: simple ways to stop the spike

Auriel WetherallLived with Type 2 diabetes for over 20 years · September 2026

When you eat, your blood sugar goes up. That happens to everyone. With Type 2, it tends to go higher and stay up for longer, and that's what people mean when they talk about a spike.

The good news is that you can often take the edge off a spike without giving up the foods you like. It's more about how and when you eat than what you cut out.

What's a normal reading after a meal?

For most people with Type 2, the general target is under 8.5 mmol/L two hours after you start eating. Your diabetes team might give you a different target, so check with them.

If you use a finger-prick meter, test two hours after your first bite. If you've got a sensor like a Libre, you'll be able to see the whole curve, which is really useful for learning what your body does.

Why you spike

• Carbs, especially the fast ones. White bread, white rice, pasta, potatoes, cereal and anything sugary break down into sugar quickly.
• Big portions. A normal amount of rice and a heaped plate of rice are two different things to your body.
• Carbs on their own. Toast on its own, or a bag of crisps, hits harder than the same carbs eaten with a proper meal.
• Drinks. Juice, smoothies, fizzy drinks and sweet coffees are some of the worst for spikes.
• Stress and poor sleep, which can push everything higher.

And some of it is just you. One person spikes on porridge and the next person is fine. That's why testing beats guessing.

Simple ways to stop the spike

Eat in order. Start with your vegetables, then your protein, and leave the carbs until last. Lots of people find this makes a real difference, and it costs nothing.

Never eat carbs naked. Put some protein or fat with them. Toast with an egg, an apple with some cheese, crackers with hummus.

Walk after you eat. Ten to fifteen minutes is enough. Your muscles use the sugar from your meal as fuel, so less of it hangs around in your blood. Even pottering round the house or washing up standing helps more than sitting straight down.

Swap some carbs. Wholegrain bread instead of white. Brown rice or a smaller portion of white. More veg on the plate so the carbs take up less room.

Watch what you drink. Water, sugar-free drinks, tea and coffee without sugar. If you want juice, have a small glass with a meal, not on its own.

Test and learn. Pick a meal you eat a lot, test it a few times, then try one change and test again. After a few weeks you'll know which foods spike you and which don't.

Don't be scared of one spike

The odd high reading after a birthday meal or a takeaway isn't going to ruin anything. Your HbA1c is an average over months. What matters is what you do most of the time, not the one meal.

If you're on tablets or insulin, keep taking them as prescribed, and speak to your GP or diabetes team before you make big changes to how much you eat. Some diabetes medication can make your sugar drop too low if you suddenly eat a lot less.

Where next

If your mornings are the problem rather than your meals, read High blood sugar in the morning. To see how all this adds up over three months, read How to lower your HbA1c. And if you've only just been diagnosed, start with Just diagnosed with Type 2? What to do first.

My free guide has a simple way to build a plate that keeps spikes down, with no banned foods.

Auriel isn't a doctor or a lawyer. This is general information from her own experience and UK guidance. Always follow your GP and diabetes team.