How to Eat for Stable Blood Sugars: Practical Tips

It's mid-afternoon. You ate lunch a couple of hours ago, but now you feel shaky, foggy, and suddenly desperate for something sweet. You grab a couple of biscuits, feel better for a few minutes, then crash again. By the time dinner comes around you are ravenous and reaching for whatever is quickest.

Most of us recognise some version of this scenario. It can be easy to put it down to a busy day or not enough sleep, and while this can contribute, often the bigger factor is simply how our meals are built - what’s on the plate, how often we eat, and what we reach for in between.

This article walks through practical nutrition tips that may help to support steadier blood sugars and more consistent energy levels throughout the day.

What "stable blood sugars" actually means

When you eat carbohydrates, your body then breaks this down into glucose (sugar), which moves into your bloodstream, raising blood sugars. Your pancreas then releases a hormone called insulin to help move that glucose into your cells. This rise and fall is completely normal and happens every time you eat carbohydrates. 

The rise itself is not something that we should be trying to avoid. However, the rate at which blood sugars rise, and subsequently dip, can impact how energised, hungry and focused you may feel.

A meal or snack that is mostly quick-digesting carbohydrate - white bread, a fizzy drink, a handful of lollies on an empty stomach - tends to send glucose up fast and then drop it just as sharply. That drop is often when the slump, brain fog, and cravings tend to kick in. A more balanced meal tends to produce a gentler rise and a slower decline, which usually results in more consistent energy levels and fewer cravings between meals.

After bariatric surgery, blood sugars are typically more reactive to carbohydrates, so you may notice that a smaller quantity of carbohydrates can cause your blood sugars to spike compared to before surgery. 

This doesn’t mean you need to totally avoid carbohydrates or chase perfectly flat lines. The aim is simply to be aware of how you feel after eating, and aim to eat carbs in a way that supports a slower rise in blood sugars. 

Nutrition tips that may help support steadier blood sugars

Choose complex carbohydrates more often

Not all carbohydrates behave the same way. Simple carbohydrates - white bread, white rice, sugary drinks, lollies, many baked goods - are broken down quickly, which tends to send blood sugar up fast and then drop it sharply. Complex carbohydrates - wholegrain bread and pasta, oats, potatoes or kumara with skin on, legumes - contain more fibre and take longer to digest, so the sugar is released more gradually. Leaning towards complex carbohydrates most of the time can be a helpful starting point.

Pair carbs, rather than eating them alone

When you eat carbohydrates on their own - a piece of toast, a handful of crackers, plain porridge - they break down more quickly, typically leading to a rapid rise and fall of your blood sugars. Pairing carbohydrates with protein and healthy fats helps to slow this down. For example:

• Eggs on wholegrain toast 

• Wholegrain crackers with edam cheese 

• Oats with yoghurt and chia seeds

Lead with protein at every meal

Protein digests more slowly than refined carbohydrates and can help you feel fuller for longer. Building each meal and snack around a protein source - eggs, Greek yoghurt, chicken, fish, tofu, legumes - is a simple anchor that may help blunt the sharp rises and falls that come from carbohydrate-heavy meals eaten on their own.

Add fibre wherever you can

Complex carbohydrates are one source of fibre, but you can add more through non-starchy vegetables, nuts, and seeds across the day. As well as slowing digestion, fibre helps with fullness and supports normal digestive function - so including at least one serve of non-starchy vegetables or fruit with each meal is an easy win.

Space meals evenly across the day 

Long gaps followed by one big meal can create the rollercoaster feeling of crashing and then overeating. Reasonably spaced meals through the day can help avoid both the dip and the rebound, keeping blood sugars steadier across the day. 

Be cautious with sugary drinks and "quick" sugars

Sugary drinks and sweet foods deliver sugar quickly and with little to slow it down, which can set off the spike-then-crash cycle. After bariatric surgery, rapidly absorbed sugars are also more likely to cause uncomfortable symptoms for some people, so many find it helps to consume them occasionally. Liquids are absorbed especially quickly, so try to avoid sugary drinks, and if you’re going to have the odd sweet food every now and then - have it at the end of a meal, rather than on an empty stomach. 

Notice your own patterns

Blood sugar responses can vary from person to person. Keeping a simple note of what you ate, when, and how you felt over the following few hours can help you spot your personal triggers. Over time this reflection can help you to develop routines that work best for your body. 

Summary

Eating in a way that supports stable blood sugars doesn’t need to mean avoiding carbohydrates all together, but rather being mindful of your overall eating patterns. Aiming for complex carbohydrates more often, pairing with protein and healthy fats, eating at sensible intervals, and limiting sugar are all approaches that may help support more consistent energy throughout the day. Above all, pay attention to how different meals leave you feeling and adjust from there. It is not about restriction or willpower, but about eating in a way that works with your body.

A little help with the planning

If the trickiest part is working out what a balanced, protein-forward meal actually looks like day to day, our recipe books are a good place to start. They are built around protein-first, sensibly portioned meals - so you have a stack of ideas ready to go for those times when inspiration runs low. They are designed with bariatric patients in mind, but the principles suit anyone wanting to support steadier energy levels. You can browse our recipe books and e-books here.

This article provides general nutrition information and is not a substitute for personalised advice from a GP or a registered dietitian or nutritionist. If you experience symptoms of low blood sugar, or have diabetes or take glucose-affecting medication, please seek advice from a health professional.