You are eating less, exercising regularly, maybe heading out for a morning walk on an empty stomach and lifting weights too — yet the scale simply won't budge. You have probably asked yourself, more than once, "Why isn't this working? Is something wrong with me?" Here is the reassuring part: the problem is most likely not your willpower. Your body doesn't behave like a simple calorie calculator — it works more like a connected hormonal system, and sometimes that system itself resists letting the weight go.
It's a system, not just calories
For years we have all heard the same formula: "Eat less, move more." So why doesn't it give everyone the same result? Because the body isn't a machine that simply subtracts the calories you burn from the ones you eat. Hormones, the nervous system, digestion and the gut constantly influence one another. When this system is in a calm state, losing weight becomes easier; when it's on high alert, the body can become more inclined to store energy and hold on to fat rather than burn it. That's why shrinking your plate isn't always enough — and why very harsh restriction can backfire, pushing stress hormones up and making things harder still.
The three blockages behind stubborn weight
In clinic, I see three blockages come up again and again behind stubborn weight. You'll probably recognise yourself in one — or several — of them.
1. Silent, low-grade inflammation. You have no fever and no obvious pain, but your body may be producing a low, constant "alarm" signal. We often see this through markers such as hs-CRP, and it is common alongside excess weight. Research suggests this chronic inflammation can blunt how cells respond to insulin — in other words, reduce insulin sensitivity. When that's the case, diets that rely on cutting calories alone often work less well than expected.
2. The insulin–cortisol cycle. Chronic stress raises cortisol, which can send blood sugar and insulin swinging. When insulin stays high for long stretches, the body becomes more inclined to store fat, particularly around the middle. Add rising appetite and cravings for sweets and carbohydrates, and the cycle starts to feed itself. Evidence points to chronic stress and higher cortisol being linked with fat around the abdomen.
3. Gut microbiota. Your gut flora affects far more than digestion — it may also influence your hunger and fullness hormones, mood-related molecules, and how your body uses energy. When you find yourself saying, "We're on the same diet, but she's losing and I'm not," your microbiota may be part of the picture. This is an exciting field, but to be honest the evidence is still emerging, and there is no single "slimming bacterium." Even so, eating in a way that nourishes your microbiota is good for your overall health.
Practical steps to calm the system
The encouraging news is that this system responds well to everyday habits. The goal isn't to force your body into "fat-burning mode" — it's to bring it out of alarm mode first. Here are a few anti-inflammatory, metabolism-friendly steps:
- Plenty of fibre and plants. Vegetables, fruit, pulses, wholegrains and soluble fibre help steady blood sugar and feed your gut flora. Filling half your plate with colourful vegetables is a good place to start.
- Enough protein. Adding a protein source to each meal — eggs, yoghurt, pulses, fish, chicken — increases fullness and keeps blood sugar steadier.
- Sleep. Too little sleep can push up both cortisol and appetite. Regular, sufficient sleep is an invisible but powerful pillar of metabolic health.
- Stress management. Short walks, breathing exercises, a little time in nature — unglamorous but real ways to bring cortisol down. Bear in mind that a punishing diet is itself a source of stress.
- Movement. Both regular activity such as walking and resistance work that protects your muscle support healthy insulin sensitivity.
- Fewer ultra-processed foods. Cutting back on heavily processed, sugar-added products is one of the most practical ways to ease the inflammatory load.
If you have dieted and exercised for years, started over again and again, and wondered "is it me?", please be gentle with yourself. You were most likely trying to fight a mis-firing system alone, on willpower. The good news is that this system can be supported with small, consistent steps — and order matters: calming the system first makes the rest easier. There is no miracle here, but once you understand the why, you have a workable, kind way forward.
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This article is for general information and isn't a substitute for individualised advice from your own doctor or dietitian.
Merve Tığlı, Dietitian
Sources: Wu & Ballantyne — Metabolic Inflammation and Insulin Resistance in Obesity, Circulation Research (2020); van der Valk et al. — Stress and Obesity: Are There More Susceptible Individuals?, Current Obesity Reports (2018); Nature Reviews Endocrinology — The gut microbiota in obesity and weight management (2022); Harvard T.H. Chan School of Public Health — The Nutrition Source (fibre and anti-inflammatory eating).