Why Blood Sugar Balance Matters - And How It Stabilises Energy, Mood and Cravings

Blood sugar balance is one of the most overlooked factors affecting energy, mood, cravings and weight and this is especially true during perimenopause. Yet many women don’t realise that unstable blood glucose may be driving the fatigue, brain fog and sugar cravings they experience daily.

 That used to be me and to manage the blood sugar dips I planned my day around my snacks!

Without regular snacks I'd feel shaky and lightheaded. My mood would fluctuate, I'd sometimes struggle to focus and had constant sugar cravings.

The turning point came when I had a very honest moment with myself, this couldn’t be the right way for me to fuel my body. I couldn't keep structuring my professional day and family life around snack logistics.

This was around 15 years ago and at that time more studies were showing the benefits of personalised nutrition to support blood glucose. I made a few changes to my diet structure and felt so much better.

Within two to three weeks of making targeted changes to how and what I was eating the snack dependency was gone. My energy was stable. My moods were even. And I felt more in control of my body than I had in years.

Fast forward to perimenopause and I discovered just how much harder blood sugar dysregulation is to control when oestrogen starts to fluctuate. The energy crashes became more pronounced, the mood dips sharper, the cravings more insistent. But by then, I had a food framework in place and my blood sugar felt balanced. That foundation protected me from experiencing what could have been a much bumpier ride.

I want to share what I learned both from my own experience and from 13 years of helping women do the same thing because I genuinely believe that blood sugar balance is one of the most underappreciated factors we have for feeling well, especially during perimenopause and beyond.

What Blood Sugar Balance Actually Means

The body maintains a tight control over the amount of glucose in our bloodstream ideally around 4 grams at any one time (that's roughly one teaspoon). This is carefully regulated by hormones, primarily insulin, which acts like a key to help glucose move from the blood into our cells where it can be used for energy.

After a meal blood glucose rises naturally. A healthy response is a gradual rise, a modest peak and a smooth return to baseline. The problems begin when the gentle rise becomes a spike followed by a crash. This happens most often with meals or snacks that are high in refined carbohydrates and low in protein, fat and fibre. Something like cereal for breakfast, a biscuit mid-morning, pasta for lunch. Each one sends glucose soaring, triggers a surge of insulin and then leaves you lower than where you started.

Research consistently shows that these repeated glucose spikes, even in people without diabetes, can drive inflammation, disrupt hormones, impair cognitive function and promote fat storage - particularly around the abdomen.

Research shows that repeated glucose spikes, even in people without diabetes, are linked to fatigue, hunger, mood instability and poor sleep.

During perimenopause blood sugar control is even more relevant. Oestrogen plays a role in insulin sensitivity so as levels fluctuate and decline many women find they become more sensitive to glucose. This is one of the reasons why weight gain, brain fog and energy crashes are so common during this life stage and why so many of my clients feel like their body is working against them.

Common Symptoms of Unstable Blood Sugar

Blood sugar instability affects almost every system in the body. Here are a few examples of what it can feel like:

• Persistent fatigue and energy crashes – especially mid afternoon

• Strong cravings for sugar or refined carbohydrates

• Mood dips, irritability and that 'don't talk to me until I've eaten' feeling

• Difficulty concentrating, poor memory and brain fog

• Disrupted sleep - high blood sugar before bed can delays sleep onset and a subsequent crash in the early hours can wake you feeling anxious or unsettled

• Weight gain - particularly around the middle

• Low-grade inflammation, which underpins joint discomfort, skin issues and a general sense of not feeling quite right

These are some of the most common complaints I hear from women in their 40s and 50s and blood sugar is almost always part of the picture.

How To Stabilise Blood Sugar Naturally

The single most impactful change I made, and the one I always recommend, was prioritising protein at breakfast.

This strategy is supported by clinical research a 2023 study found that a high protein breakfast significantly reduced post meal glucose disruptions throughout the day. Protein slows gastric emptying, blunts the glucose response and crucially, it sustains satiety in a way that carbohydrates alone don’t.

For me, the change was easy - I swapped my porridge and berries for a bowl of Greek yoghurt with nuts, seeds and raspberries. I still eat a variation of this on most mornings.

My Framework For Stable Blood Sugar

• Beyond breakfast, here are the principles that make the most consistent difference for my clients:

• Build every meal around protein and fibre first - this is your glucose buffer. Add carbohydrates to a meal that already has structure, rather than making them the centrepiece.

• Eat in a consistent rhythm - irregular meal timing creates blood sugar volatility. Your body responds well to predictability.

• Move after meals - even a 10 to 15 minute walk after eating has been shown to significantly reduce post meal glucose spikes by encouraging muscles to take up glucose directly.

• Manage stress intentionally - cortisol directly raises blood glucose, which is why stress eating is so physiologically understandable and why chronic stress undermines all the best dietary intentions.

• Prioritise sleep - poor sleep impairs insulin sensitivity the following day. The two are deeply intertwined.

Why Blood Sugar Balance Matters For Long Term Health

Blood sugar balance isn't just about how you feel day to day (although that obviously does matter!).

Chronic glucose instability is associated with accelerated cellular ageing through a process called glycosylation, where excess glucose binds to proteins and damages them contributing to inflammation, cardiovascular risk and cognitive decline over time.

Taking care of your blood sugar now is one of the most meaningful things you can do for your long-term health. The good news is that the dietary changes required aren’t dramatic, they don't involve calorie counting, eliminating entire food groups, or giving up the things you enjoy.

It took me two to three weeks to feel the difference. My clients typically notice changes within the same window. That's a very short investment for a very significant return.

Ready To Get Started?

If any of this resonates whether you're running on snacks and caffeine, struggling with energy crashes, battling cravings you can't seem to shake, or noticing your mood and sleep aren't what they used to be - I'd love to help you get to the bottom of it.

A great place to begin is with breakfast. I've put together a free eBook with simple, protein rich breakfast ideas that genuinely taste good and are easy to pull together even on busy mornings. These are the kinds of breakfasts I recommend to my clients, and many of them have told me it's the change that shifted everything.

Download your free Breakfast eBook here

And if you'd like personalised support whether you're navigating perimenopause, struggling with weight, energy or mood, or simply want to feel more like yourself again I offer a month-long programme that gives you the structure, guidance and ongoing support to make these changes stick.

Because food should nourish you. And small changes, done consistently, really do make a big difference.

Frequently Asked Questions

Is blood sugar balance only something people with diabetes need to worry about?

Not at all and this is probably the most important misconception I come across. Blood sugar regulation is something every single one of us does, all day, every day. Type 2 Diabetes is what happens when that regulation breaks down significantly over a long period of time.

The fluctuations that cause daily symptoms like - fatigue, cravings, brain fog, mood dips - can happen long before anyone is anywhere near a diabetes diagnosis.

Do I need to give up carbohydrates completely?

Absolutely not carbohydrates are not the enemy; the type, quantity and context in which you eat them is what matters.

Cutting carbs completely is unnecessary for most people, difficult to sustain long term and can leave you feeling miserable and deprived which is the opposite of what we're going for.

What I focus on with my clients is building meals that have a strong protein and fibre foundation first and then adding carbohydrates into that structure. When carbohydrates arrive in a meal alongside protein, fat and fibre, the glucose response is far gentler. Oats eaten with Greek yoghurt, nuts and seeds behaves very differently in your body to a bowl of porridge with honey! Context is everything.

Can I still eat bread?

Yes but with some thought about how and when. Bread made from refined white flour is digested quickly and tends to produce a sharp glucose spike, particularly if eaten on an empty stomach or without much else alongside it. Swapping to a dense sourdough or a seeded pumpernickel type bread makes a meaningful difference these are digested more slowly thanks to their fibre content and fermentation process.

More importantly, what you eat with your bread matters just as much as the bread itself. Toast topped with eggs, nut butter or smoked salmon will produce a very different blood sugar response to toast with jam.

Why am I gaining weight around my middle now, when I haven't changed what I eat?

This is one of the questions I hear most often, and I understand how frustrating it is - especially when you feel like you're doing everything you've always done. The answer lies in how your body handles glucose during perimenopause and menopause.

Oestrogen plays an active role in how efficiently the body processes glucose. As oestrogen levels fluctuate and decline, the body becomes less effective at managing blood sugar and is more inclined to store it as fat and less inclined to burn it for energy. Abdominal fat tissue is particularly sensitive to this hormonal shift. This means that a diet that was perfectly fine in your 30s may now be tipping your blood sugar in a direction that encourages fat storage around the middle not because you've done anything wrong, but because your physiology has changed. Adjusting the composition of your meals, particularly reducing refined carbohydrates and increasing protein, can make a significant difference.

Why do I get an energy slump every afternoon?

The classic 3pm slump is almost always blood sugar related. If your lunch was carbohydrate-heavy and light on protein such as a sandwich, a bowl of pasta, vegetable soup and bread your glucose will have risen quickly after eating and then dropped, often to below where it started. That drop is what you feel as the afternoon fog, the heavy eyes, the sudden need for something sweet.