Stress, Sugar & Serotonin
How this Hidden Cycle is Affecting Your Mental Health
By Sam Botica, Naturopath
Have you ever noticed that when you’re stressed, you crave certain foods?
Do you ever find yourself reaching for something sweet in the afternoon, craving carbs late at night, or needing that extra coffee just to get through the day? It might feel like a lack of willpower but actually, you can cut yourself some slack, because there’s something deeper at play on a physiological level.
Stress, blood sugar, and brain chemistry are all closely connected. And when this system becomes dysregulated, it can have a big impact on your mood, energy, focus, and your overall mental health.
I'm going to unpack what’s really going on - so you can stop beating yourself up AND find a better way.
How Stress Drives Cravings and Blood Sugar Swings
When you’re under stress, whether it’s work pressure, lack of sleep, emotional strain, or even ongoing low-grade worry, your body releases stress hormones like cortisol.
Cortisol has a job to do - it helps mobilise energy so you can respond to a perceived threat.
One of the ways it does this is by increasing your blood sugar levels.
At the same time, stress can:
Increase your appetite (particularly for quick energy foods)
Reduce your sensitivity to fullness signals
Drive cravings for sugar and refined carbohydrates
Why? Because your body is looking for fast fuel.
The problem is, when you respond to these cravings with processed foods or snacks high in sugar, you get a rapid spike in blood glucose, and that my friend, is followed by a crash.
We often forget about the crash...
But that crash doesn’t just affect your energy levels.
It affects your brain.
The Downstream Effects on Mood, Anxiety & Energy
Blood sugar instability can create a rollercoaster effect throughout your day.
When blood sugar rises quickly:
You may feel temporarily energised or uplifted
When it drops:
You can feel irritable, anxious, shaky, or flat
Concentration becomes harder
You may experience brain fog or low motivation
Over time, repeated spikes and crashes can:
Increase overall anxiety levels
Contribute to low mood or depressive symptoms
Disrupt sleep
Leave you feeling constantly tired but wired
This is where serotonin comes into the picture.
Serotonin is one of your key “feel good” neurotransmitters. It plays a role in mood, emotional regulation, sleep, and even appetite.
Interestingly, your body often craves carbohydrates when serotonin is low because carbs can temporarily help increase serotonin production in the brain.
This is why you might reach for:
Chocolate
Bread or pasta
Pastries
Sweet snacks
It’s not random, it’s your body trying to self-regulate and get its needs met.
But again, this is usually a short-term fix that feeds back into the same blood sugar cycle.
The Gut–Brain Connection
It's About More Than Just Digestion
Your gut and brain are in constant communication.
In fact, a large portion of serotonin is produced in the gut, and your gut microbiome (the trillions of bacteria living in your digestive system) plays a significant role in:
Mood regulation
Stress resilience
Craving patterns
Inflammation levels
When the microbiome is out of balance (due to stress, diet, medications, or illness), it can:
Increase cravings for sugar and processed foods
Contribute to inflammation that affects brain function
Impact the production and signalling of neurotransmitters
This means your cravings aren’t just about habits, they can be biologically driven.
Breaking the Cycle
Supporting Your Brain & Body
The goal isn’t to eliminate stress completely - that’s just not realistic.
The goal is to create stability in your system so you’re less reactive to stress - not just in your awareness of stress, but how your body actually responds to stress (even when you're not noticing and calling it stress).
Here are some simple, effective ways to start:
1. Stabilise Blood Sugar Through Food
Aim for balanced meals that include:
Protein (eggs, chicken, red meat, legumes, tofu)
Healthy fats (olive oil, avocado, nuts, seeds)
Fibre-rich carbohydrates (vegetables, whole grains)
This helps slow the release of glucose into the bloodstream, preventing spikes and crashes.
Tip: Start your day with a protein-rich breakfast to set a more stable foundation. Scrmabled eggs with avocado or an omelette with some cooked vegetables, maybe even topped with salmon is a great way to start the day!
2. Don’t Skip Meals (Especially When Stressed)
Skipping meals can worsen blood sugar dips and increase cravings later in the day.
And coffee is not a meal replacement!
Even if your appetite is low, small, balanced meals or healthy nutrient dense snacks can help regulate your system.
3. Support Your Gut Health
Focus on:
Whole, unprocessed foods
A variety of plant-based fibres
Fermented foods (like yoghurt, kefir, sauerkraut) if tolerated
A healthy gut microbiome supports better mood regulation and more stable energy.
Tip: Most people don't realise that there are many strains of probiotics and specific strains can support different goals - including the gut/brain axis for better mental clarity. We have a rnage of probiotics for targeted treatment plans.
4. Personalised Herbal & Nutritional Support
This is where naturopathy can be especially helpful.
Depending on your individual needs, support may include:
Herbs to regulate stress hormones
Nutrients that support neurotransmitter production
Supplements for depleted minerals
Gut repair and microbiome protocols
This kind of targeted approach can help restore balance more efficiently than diet alone.
5. Create Small Daily Anchors
Your nervous system thrives on consistency.
Simple routines can make a big difference:
Eating meals at regular times
Getting at least 5 minutes of early morning sunlight
Gentle movement everyday (like walking)
Reducing caffeine - especially later in the day
Winding down for sleep a few hours before with less screens, low lighting, and calm activities
These signals help regulate your internal rhythms, supporting both mental and physical resilience.
The Big Takeaway to Remember
If you’re finding yourself stuck in cycles of cravings, energy dips, irritability, or brain fog, there’s likely more going on than just “what you’re eating.”
Stress, blood sugar, gut health, and brain chemistry are all interconnected.
And when one is out of balance, the others can fall out of sync too.
But with the right support, this cycle can be shifted.
You might be surprised how quickly things can get back on track with the right adjustments.
You don’t need to rely on willpower alone.
How to Get Expert Support
If you’re experiencing ongoing stress, low mood, fatigue, or difficulty concentrating, our highly experienced naturopath Sam Botica can help identify what’s driving these patterns and create a personalised plan to support your mental health from the inside out.
Book a consultation here to start restoring balance to your system OR call our friendly team on 08 9328 9233 to find out about a free 15 minute discovery call.