I’m doing all the right things, why can’t I shift my belly fat? A Nutritional Therapist Explains

I have been there and it’s frustrating and confusing: you are cutting calories, exercising more than you ever did, and still, the weight that has accumulated in strange new places – your mid-section, arms, back – just won’t shift. 

You are not going crazy, you are not being lazy, and rarely is the answer further restriction or a fad diet. Your underlying biology has changed. The key now is understanding and working with it.

A qualified nutritional therapist (RNT) can work with you, identify the drivers to that weight gain and develop a plan specifically tailored to your body, your preferences and lifestyle. 

What does nutritional therapy look at?

The right balance of protein and fibre.

Many food diaries reveal a gap here — not from lack of effort, but because protein and fibre needs shift with age. The right balance of these macro-nutrients will help to preserve muscle mass (which itself drives your metabolic rate), keep you fuller for longer, and stabilise blood sugar. Bonus benefits to this approach can include increased energy, better digestion, less sleep disturbance, etc.

Insulin sensitivity and blood sugar regulation.

As oestrogen declines through perimenopause and beyond, cells can become less responsive to insulin. This makes the body more inclined to store fat, particularly around the middle, and can drive the energy dips and cravings that make healthy eating choices harder. Understanding and supporting insulin sensitivity — through food intake, meal structure and timing — is one of the most powerful levers available to an NT.

Can cutting calories make weight gain worse?

I see this in clinic.  The body reads too much calorie restriction as a physiological stressor. It raises cortisol, which encourages fat storage, disrupts sleep, and can suppress thyroid function – all creating havoc with your metabolism.  This is why the ‘eat less, move more’ advice can be so unhelpful at this point in life.  Plus, calorie restriction can deplete nutrients, which can lead to muscle loss, hair thinning, breaking nails and  lack of energy among other things.

Why is my thyroid relevant to weight gain?

The thyroid governs metabolic rate (how you use your energy), and subclinical or borderline underactivity is not uncommon in middle age.  Where symptoms suggest it — fatigue, cold sensitivity, sluggish digestion, brain fog, hair thinning —thyroid testing can be insightful and guide thyroid support with diet and supplementation (or medication if thought necessary by your GP).

What else affects weight at this life stage?

Muscle mass and strength. From your 40s onward, muscle mass naturally declines unless it's actively maintained.  Muscle is metabolically active tissue.  Having less of it means a lower resting metabolic rate (you burn less calories).

Sleep and stress. Poor sleep alters the hormones that regulate appetite and hunger cues, and chronic stress keeps cortisol elevated in ways that directly influence where and how the body stores fat. These aren't ‘soft’ factors — they're measurable, physiological ones.

Gut health. An increasing body of research links the diversity and balance of the gut microbiome to metabolic health, inflammation and even how efficiently the body regulates blood sugar.

So what now?

When you understand what's driving the changes you're seeing, pure restriction stops being the answer and informed, sustainable adjustment to your diet and lifestyle can happen.

As a bonus that shift — from fighting your body to working with it — can restore something beyond the number on the scales.  It can bring a sense of being back in the driver's seat, and of feeling like yourself again.

If you'd like an honest, evidence-based look at what might be going on for you, I offer a discovery call to talk through your goals and to see if my approach feels like the right fit for you.  See here for more details of what happens in a discovery call.   

Frequently Asked Questions

Does menopause cause weight gain?

Menopause doesn't cause weight gain directly, but declining oestrogen during perimenopause and menopause affects insulin sensitivity, fat distribution and muscle mass — all of which make weight gain more likely and weight loss harder, even without changes to diet or exercise.

Can stress cause weight gain even with a good diet?

Yes. Chronic stress keeps cortisol elevated, which encourages fat storage (particularly around the abdomen) and can disrupt sleep and blood sugar regulation — both of which further affect weight, regardless of how well you're eating.

How is nutritional therapy different from a diet?

Nutritional therapy doesn't start from a fixed set of rules. It starts with your individual biochemistry, history and life stage, and identifies the specific factors — hormonal, metabolic or otherwise — driving what you're experiencing, then builds a personalised plan around them.

Do I need blood tests before starting nutritional therapy?

Not always, but relevant testing (such as thyroid function or blood sugar markers) may be recommended where your history and symptoms suggest it's warranted, to ensure the plan is based on what's actually happening in your body.