Why won’t the weight shift despite diet and exercise?
Quick answer: Weight that won’t respond to diet and exercise — especially around the middle — is commonly driven by insulin resistance, cortisol dysregulation, thyroid dysfunction, oestrogen dominance, or gut microbiome imbalances. Identifying which hormonal or metabolic factors are at play changes the approach entirely.
If you’ve been counting calories, exercising more, and still can’t shift weight — you’re not failing at willpower. This is the most important thing I want my weight management clients to understand. Weight that resists conventional approaches is almost always being driven by underlying hormonal, metabolic, or inflammatory factors that no amount of restriction will overcome.
What hormonal and metabolic drivers do you commonly identify?
Insulin resistance: The most common metabolic driver of stubborn weight gain, particularly around the abdomen. When cells become resistant to insulin, the body compensates by producing more — and high insulin is a powerful fat-storage signal. Research shows that insulin resistance affects up to 25% of the adult population and is frequently undiagnosed (Freeman & Pennings, 2022, StatPearls).
Cortisol and chronic stress: Elevated cortisol promotes visceral fat deposition — the “stress belly” pattern. It also increases appetite, promotes cravings for high-sugar foods, and impairs sleep, creating a cycle that’s very difficult to break through willpower alone.
Thyroid dysfunction: Even subclinical hypothyroidism slows metabolic rate, making weight loss significantly harder. I assess full thyroid panels in all weight management clients.
Oestrogen dominance: Excess oestrogen relative to progesterone promotes fat storage, particularly around hips, thighs, and buttocks. This can be driven by impaired liver clearance of oestrogen, gut dysbiosis affecting the oestrobolome, or environmental oestrogen exposure.
Gut microbiome: Emerging research demonstrates that the composition of your gut bacteria directly influences energy extraction from food, fat storage signalling, and metabolic inflammation (Cani, 2018, Gut).
What does a realistic treatment approach look like?
I start by identifying which drivers are most relevant for you through detailed assessment and targeted blood work. Treatment then focuses on correcting the underlying imbalances: dietary strategies tailored to your metabolic profile (not generic calorie restriction), herbal and nutritional support for insulin sensitivity, cortisol management, thyroid optimisation, and gut health restoration.
Realistic expectations are important. Sustainable weight loss driven by metabolic correction typically occurs at a rate of 0.5–1kg per week once the underlying drivers are being addressed. The difference is that this weight stays off because the cause has been corrected, not just the symptom managed.
References: Freeman, A.M. & Pennings, N. (2022). Insulin Resistance. StatPearls Publishing. Cani, P.D. (2018). Human gut microbiome: hopes, threats and promises. Gut, 67(9), 1716–1725.