Medical Disclaimer: This article is intended for educational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional before making changes to your diet, lifestyle, or supplement routine, particularly if you have a diagnosed medical condition or are taking medication.
You’re Doing “Everything Right” — So Why Do You Still Feel This Way?
You’re waking up exhausted even after a full night’s sleep. Your energy crashes mid-afternoon, your cravings for sugar and carbs feel completely out of your control, and no matter how carefully you eat, that stubborn belly fat isn’t budging.
You’ve been told to eat less and exercise more. You’ve tried it. It hasn’t worked.
Here’s what most conventional advice misses: your hormones may be working against you. Specifically, two of the most influential hormones in your body — insulin and cortisol — may be locked in a cycle that makes fat loss, energy, and sleep feel almost impossible.
The encouraging news is that this cycle can be interrupted. But first, you need to understand what’s driving it.
What Is Insulin Resistance?
Insulin is a hormone produced by your pancreas. Its primary job is to act as a “key” that unlocks your cells so that glucose (sugar) from your bloodstream can enter and be used for energy.
Insulin resistance occurs when your cells stop responding to insulin’s signal efficiently. The pancreas compensates by producing more and more insulin, but the cells remain partially “locked.” The result is persistently elevated blood sugar and elevated insulin levels — a state that, over time, contributes to weight gain, inflammation, and metabolic dysfunction.
Common Causes of Insulin Resistance
- A diet high in refined carbohydrates, sugar, and ultra-processed foods
- Physical inactivity and prolonged sitting
- Chronic sleep deprivation
- Chronic psychological and physiological stress
- Excess body fat, particularly around the abdomen
- Hormonal imbalances, including thyroid dysfunction and elevated cortisol
Insulin resistance exists on a spectrum. Many people have it for years before it shows up on a standard blood test — and during that time, they’re experiencing symptoms that are often dismissed or attributed to “just getting older.”
What Is Cortisol Overload?
Cortisol is your primary stress hormone, produced by the adrenal glands. It plays an essential role in regulating your sleep-wake cycle, managing inflammation, mobilising energy, and helping your body respond to perceived threats.
In short bursts — during a workout, a work deadline, or a moment of genuine danger — cortisol is helpful and necessary. The problem arises when stress becomes chronic and cortisol output remains persistently elevated.
High Cortisol Symptoms to Watch For
Chronically elevated cortisol can manifest in a wide range of ways, including:
- Fatigue that doesn’t improve with rest
- Brain fog and difficulty concentrating
- Anxiety, irritability, or a sense of being “wired but tired”
- Poor sleep — particularly difficulty staying asleep between 2–4am
- Increased belly fat, even with a reasonable diet
- Strong sugar and carbohydrate cravings, particularly in the evenings
- Lowered immunity — getting sick more frequently
- Irregular menstrual cycles or worsened PMS in women
- Low libido and mood disturbances
- Elevated blood pressure or resting heart rate
Many of these symptoms overlap significantly with insulin resistance — and that’s not a coincidence.
The Connection Between Insulin Resistance and Cortisol
This is where functional medicine offers a perspective that conventional healthcare often overlooks.
Cortisol directly raises blood sugar. When your body perceives stress — whether that’s a difficult conversation, a skipped meal, financial pressure, or three consecutive nights of poor sleep — cortisol signals your liver to release stored glucose into the bloodstream. This is your body preparing for a “fight or flight” response. It needs quick energy.
The problem is that most modern-day stressors don’t require physical exertion. That glucose enters the bloodstream, triggers an insulin response, and if this happens repeatedly, your cells begin to become resistant to insulin’s signal.
Conversely, insulin resistance worsens cortisol output. Blood sugar dysregulation — the highs and crashes — is itself a physiological stressor. Every time your blood sugar drops sharply, your adrenal glands respond by releasing cortisol to raise it back up. This creates a feedback loop:
Stress → elevated cortisol → elevated blood sugar → insulin spike → blood sugar crash → cortisol release → repeat.
If you’ve ever felt shaky, anxious, or irritable when you haven’t eaten — and then immediately craved something sweet — you’ve felt this cycle in action.
Signs You May Have Both Insulin Resistance and Cortisol Overload
Consider whether you recognise the following pattern of symptoms:
- Persistent fatigue despite adequate sleep
- Difficulty losing weight, particularly around the abdomen and waist
- Strong cravings for sugar, refined carbs, or salty foods — especially in the evenings
- Energy slumps after meals, particularly after lunch
- Feeling anxious or “on edge” much of the time
- Waking between 2am and 4am and struggling to fall back asleep
- Afternoon crashes that require caffeine or sugar to push through
- Frequent headaches or difficulty concentrating
- Low mood, particularly in the mornings
- A history of chronic stress, burnout, or high-pressure environments
- Elevated fasting blood glucose on routine bloods (even within “normal” range but trending upward)
- High triglycerides or low HDL cholesterol on a lipid panel
If several of these resonate, it’s worth investigating both your metabolic health and your stress hormone patterns with a qualified clinician.
Root Causes: A Functional Medicine Perspective
Functional medicine asks why — not just what. Rather than treating insulin resistance and cortisol overload as separate problems requiring separate medications, the functional approach looks for the upstream drivers.
Chronic Stress
South Africans face a unique and often underacknowledged stress burden — financial pressure, load shedding, safety concerns, and socioeconomic stressors are real and physiologically significant. Your nervous system doesn’t distinguish between being chased by a predator and lying awake worrying about an electricity bill. The cortisol response is the same.
Poor Dietary Patterns
A diet dominated by refined carbohydrates, added sugars, seed oils, and ultra-processed foods creates a relentless cycle of blood sugar spikes and crashes. Every spike demands an insulin response. Over time, this taxes the system and drives resistance.
Sleep Disruption
Even one or two nights of poor sleep can measurably impair insulin sensitivity. Chronic sleep deprivation elevates cortisol, disrupts appetite-regulating hormones (ghrelin and leptin), and makes you significantly more likely to overeat refined carbohydrates the following day.
Gut Health and Inflammation
A disrupted gut microbiome — often caused by antibiotic use, chronic stress, poor diet, and alcohol — contributes to systemic low-grade inflammation. This inflammation impairs insulin signalling at a cellular level and further drives cortisol dysregulation. The gut-brain-hormone axis is real, and it matters enormously in this context.
How to Overcome Insulin Resistance and Cortisol Overload
There are no quick fixes here — and anyone offering them isn’t being honest with you. What there is, however, is a clear, evidence-informed pathway that, applied consistently, can meaningfully improve both insulin sensitivity and cortisol regulation.
1. Nutrition: Eat to Stabilise Blood Sugar
This is foundational. The goal isn’t perfection — it’s reducing the frequency and severity of blood sugar spikes and crashes.
Practical principles:
- Prioritise protein at every meal. Protein blunts the blood sugar response to carbohydrates and keeps you fuller for longer. Aim for eggs, fish, chicken, legumes, or quality dairy at breakfast and lunch especially.
- Choose low-glycaemic carbohydrates. Sweet potato, brown rice, oats, lentils, and vegetables over white bread, white rice, and sugary cereals.
- Add fibre consistently. Fibre slows glucose absorption. Focus on vegetables, legumes, seeds (particularly chia and flaxseed), and whole fruits rather than juices.
- Include healthy fats. Avocado, olive oil, nuts, and fatty fish support cell membrane function and reduce inflammation. Fat also slows gastric emptying, blunting blood sugar spikes.
- Reduce ultra-processed foods and added sugars. This includes many “health” products — energy bars, flavoured yoghurts, fruit juices, and low-fat products often contain significant hidden sugars.
- Don’t skip meals — particularly breakfast. Skipping meals triggers a cortisol response and can worsen blood sugar instability throughout the day.
2. Stress Management and Nervous System Regulation
You cannot supplement your way out of chronic stress. Addressing the nervous system is non-negotiable.
Practical approaches:
- Diaphragmatic breathing (box breathing or 4-7-8 breathing) activates the parasympathetic nervous system and can measurably lower cortisol within minutes. Practise for 5–10 minutes daily — not only when you’re anxious.
- Morning sunlight exposure. Getting natural light into your eyes within 30–60 minutes of waking helps regulate your circadian rhythm and normalises the cortisol awakening response, which governs your entire day’s stress pattern.
- Set boundaries around news and social media consumption. Perceived threat — even from a screen — drives cortisol. Limit exposure, particularly in the morning and evening.
- Build in genuine rest. Rest is not Netflix after a 12-hour workday. It is intentional downtime — a walk without your phone, time in nature, connection with people you trust, or a creative activity you genuinely enjoy.
- Consider professional support. Therapy, particularly approaches that address nervous system regulation, can be profoundly effective for chronic stress and cortisol dysregulation.
3. Sleep Optimisation
Sleep is when your body repairs, resets cortisol, and restores insulin sensitivity. It is arguably the single most important lever in this entire process.
Practical strategies:
- Aim for 7–9 hours of sleep in a cool, dark, quiet room
- Keep a consistent sleep and wake time — even on weekends
- Avoid screens and bright overhead lighting for at least 60 minutes before bed
- Avoid caffeine after 1pm if you’re sensitive or struggling with sleep
- Avoid large meals within 2–3 hours of bedtime — late eating raises insulin and can disrupt cortisol rhythms overnight
- If you’re waking between 2–4am consistently, this is a clinical sign worth investigating — it often points to blood sugar dysregulation or elevated nocturnal cortisol
4. Exercise: The Right Kind, in the Right Amount
Exercise is one of the most powerful tools for improving insulin sensitivity — but the type and amount matters, particularly when cortisol is already elevated.
What helps:
- Strength training (resistance exercise) 2–3 times per week. Muscle tissue is the primary site of glucose uptake. More muscle means better blood sugar regulation. You don’t need a gym — bodyweight exercises are effective.
- Daily walking. A 10–20 minute walk after meals has been shown to significantly blunt post-meal blood sugar spikes. It also lowers cortisol, improves mood, and supports sleep quality.
What to be cautious about:
- High-intensity training every day — when cortisol is already dysregulated, excessive high-intensity exercise (particularly on an empty stomach) can worsen cortisol output and blood sugar instability. More is not always better.
- Exercising through exhaustion. If you’re in a phase of significant burnout or adrenal fatigue, intense exercise can be counterproductive. Prioritise sleep and nervous system recovery first.
5. Blood Sugar Stabilisation Habits
Small, consistent habits can make a meaningful difference to blood sugar stability throughout the day:
- Eat meals in the order of vegetables → protein and fat → carbohydrates (research suggests this sequence significantly reduces post-meal glucose spikes)
- Avoid eating carbohydrates in isolation — always pair them with protein, fat, or fibre
- Stay well hydrated — even mild dehydration can elevate cortisol
- Minimise alcohol — it disrupts sleep, raises cortisol, and impairs blood sugar regulation
- Consider a brief walk after meals rather than sitting down immediately
Supplements: A Cautious, Supportive Role
Supplements can support this process but should never replace the foundational lifestyle work above. Always discuss supplementation with your healthcare provider before starting, particularly if you have any diagnosed conditions or take medications.
Magnesium
Magnesium is one of the most commonly deficient minerals in modern diets and is involved in over 300 enzymatic processes — including glucose metabolism and cortisol regulation. Magnesium glycinate or magnesium bisglycinate are generally well-tolerated forms, and many people notice improvements in sleep quality and stress resilience. A typical therapeutic dose ranges from 200–400mg taken in the evening.
Omega-3 Fatty Acids
Omega-3s (found in fatty fish like salmon and sardines, as well as fish oil supplements) have well-established anti-inflammatory properties and may support insulin sensitivity and cortisol regulation. Look for a supplement with a combined EPA and DHA content of at least 1,000mg per day.
Adaptogens
Adaptogenic herbs such as ashwagandha, rhodiola, and holy basil have been used traditionally and are increasingly studied for their potential to support the body’s stress response. They work by modulating the HPA (hypothalamic-pituitary-adrenal) axis — the system that governs cortisol production. The research is promising but still evolving, and quality and dosing matter considerably. These should be used under guidance rather than self-prescribed, particularly if you have thyroid conditions, autoimmune issues, or are pregnant.
When to Seek Professional Help
Lifestyle changes are powerful — but there are circumstances where professional evaluation is essential, not optional.
Please consult a healthcare professional if:
- You have been diagnosed with, or suspect you may have, type 2 diabetes or prediabetes
- You have consistently elevated fasting blood glucose or HbA1c on blood tests
- Your symptoms are significantly impacting your quality of life, work, or relationships
- You are experiencing symptoms of severe burnout, depression, or anxiety
- You are pregnant, breastfeeding, or planning to conceive
- You are on any chronic medications, particularly for blood pressure, blood sugar, or mental health
- You’ve made consistent lifestyle changes for 2–3 months with no meaningful improvement
A thorough functional medicine assessment — including fasting insulin, HbA1c, a cortisol profile, thyroid function, and an inflammatory marker panel — can give you a far clearer picture of what’s actually driving your symptoms, and allows for a targeted, personalised approach rather than guesswork.
Final Thoughts: Consistency Over Perfection
If you’ve recognised yourself in this article, please understand something important: this is not a willpower problem. Insulin resistance and cortisol overload are physiological states driven by real biological mechanisms — and they can be meaningfully addressed with the right approach.
But they didn’t develop overnight, and they won’t resolve overnight either.
What works is not a dramatic 10-day detox or a punishing exercise regime. What works is rebuilding your body’s metabolic and stress resilience through consistent, sustainable habits — better sleep, balanced meals, intentional movement, and genuine nervous system recovery.
Small changes, applied consistently over weeks and months, compound into real, lasting results.
If you’re not sure where to start or how to assess where you are metabolically, that’s exactly the kind of work we do at Ask Dr Olz. Your symptoms are telling you something. It’s worth listening.
This article is for educational purposes only. The information provided does not constitute medical advice and is not intended to replace professional medical consultation, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you may have regarding a medical condition.
