Why is weight loss so difficult?

Most of us have heard it a hundred times. Eat less, move more, and the weight will come off. If only it were that simple. Around two in three adults in the UK are living with overweight or obesity. If the answer were simply a matter of trying harder, that number would look very different.

The truth is that weight is shaped by far more than the choices we make at the dinner table. Our biology, our sleep, our stress levels, our work patterns, our emotions, the food environment around us and the habits we've built over decades all play a part. Treating weight as a simple sum ignores almost everything that makes it hard.

Human bodies evolved in a world where food was often scarce. When we lose weight, the body responds as if it's protecting us from famine: hunger signals can become louder, feelings of fullness can become quieter, and the body can become more efficient with the energy it has. None of this is a personal failing. It's physiology.

At the same time, we live surrounded by food that is cheap, convenient, heavily marketed and served in portions far larger than a generation ago. Put those two things together and it's no surprise that so many people find weight loss difficult, and keeping weight off even harder.

Many people describe a familiar pattern. They start a new diet full of hope, lose some weight, and feel great. Then something happens: a stressful month at work, a family crisis, a holiday, an illness. The routine slips, the weight creeps back, and they blame themselves. A few months later, they try again, often with a stricter plan, and the cycle repeats.

Each time round, confidence takes another knock. It's easy to conclude "I'm just not good at this" or "I've no willpower". But when the same pattern happens to millions of people, it tells us something important: the problem lies with the approach, not the person.

Part of what makes weight loss so frustrating is the sheer amount of conflicting advice out there. A few of the most common myths we hear in clinic include:

• "If I'm strict enough, I'll succeed." Very restrictive plans are among the hardest to sustain, and they often lead to a rebound.
• "It's all about willpower." Willpower is limited, and it tends to run out exactly when we're tired, stressed or busy.
• "I need to cut out all my favourite foods." Lasting change is about balance and flexibility, not banning foods forever.
• "If the scales don't move, it's not working." Health improves in many ways that the scales don't show.
• "Once I reach my goal, I'm done." Keeping weight off is a skill in itself, and it deserves just as much attention.

In general practice, weight is one of the most common things people want help with, and one of the hardest areas in which to offer meaningful support within a ten-minute appointment. Patients often arrive already feeling embarrassed, expecting to be told what they already know. What most of them actually need is time, understanding, and practical tools that work in their real lives. That gap between what people need and what's available is exactly what this programme was designed to fill.

One of the biggest barriers people face isn't food at all. It's stigma. People living with obesity are often portrayed as lazy or lacking self-control, in the media, in workplaces, and sadly sometimes in healthcare too. Many people tell us they have felt judged, lectured or dismissed when they've asked for help.

Stigma doesn't motivate change. In fact, research consistently shows the opposite: feeling ashamed about weight is linked with more stress, more comfort eating and less willingness to seek support. It also feeds the inner critic, the voice that says "I've failed again", which makes the next attempt feel even harder to start.

Obesity is now recognised by clinical bodies, including NICE, as a chronic, long-term condition, not a character flaw. That shift in understanding matters, because it changes the question from "what's wrong with you?" to "what support do you need?"

For a condition that affects so many people, support can be surprisingly hard to find. NHS weight management services are often oversubscribed, with long waits and strict eligibility criteria. Commercial diets can promise fast results but rarely address the reasons behind our eating. And quick-fix plans tend to work for a few weeks, before life gets in the way and the weight returns.

What's usually missing is help with the how: how to handle cravings on a difficult evening, how to eat out without undoing a week's effort, how to get back on track after a setback, and how to keep going once the initial motivation fades.

As GPs and clinicians, we've seen first-hand how often people are left to struggle on their own. That's why we created the Raiys Weight Management Programme: a supportive, evidence-based programme that focuses on building lasting habits and a healthier relationship with food, rather than rigid rules or quick fixes.

Over 12 weeks, the programme works through the things that really make the difference, from realistic expectations and readiness to change, through portions, hunger, cravings and emotional eating, to sleep, stress and keeping weight off for the long term. Each week answers one of the big questions people ask us, and the articles in this series take a closer look at each one.

The evidence points towards a few things that make a real difference. Changes that are small and sustainable rather than dramatic. Support that addresses behaviour and emotions, not just food. Tools for managing the difficult moments, rather than simply instructions about what to eat. And above all, an approach that treats people with respect and kindness, rather than blame.

That's what we've tried to build. The Raiys Weight Management Programme is designed to fit around real life, in short daily sessions, so that each week you're building a new skill rather than following someone else's rules. It's not a diet. It's a way of understanding yourself and your habits better, so the changes you make are ones you can keep.

The programme is designed for adults who want to lose weight or improve their health, and who are tired of quick fixes. You might have tried many diets before, or this might be your first serious attempt. You might want to work through every topic in order, or focus on the areas that matter most to you, such as snacking or emotional eating. Either way, the programme meets you where you are.

Over the next 12 weeks, you'll explore:

• Week 1: Understanding Weight Loss
• Week 2: Readiness to Change
• Week 3: Portions and Meal Structure
• Week 4: Hunger and Fullness
• Week 5: Snacking and Cravings
• Week 6: Control of Eating
• Week 7: Planning for Success
• Week 8: Emotional Eating
• Week 9: Alcohol and Eating Out
• Week 10: Problem Solving and Unhelpful Thoughts
• Week 11: Lifestyle Factors Affecting Weight
• Week 12: Long-Term Weight Maintenance

Is this another diet?

No. The programme doesn't give you a strict meal plan or a list of banned foods. It focuses on the habits, thoughts and environment behind eating, so that changes last.

How much time does it take?

Each daily session is around five minutes, with a short reflection and a simple action to try. It's designed to fit into a busy life.

Who created it?

The programme was developed by Raiys Digital Health, a clinician-led company, and is aligned with current NICE and SIGN guidance.

Can I use it alongside other support?

Yes. The programme can be used on its own or alongside other support from your GP, a dietitian or a weight management service. If you're taking weight loss medication, the habits it builds can complement your treatment.

The Raiys Weight Management Programme is a 12-week, clinician-led digital programme designed to be used alongside the BeChange app. Each week focuses on one course, broken into short five-minute daily sessions, each with a reflection and a simple action to take into your day. It's built on current NICE and SIGN guidance and on proven behaviour-change approaches, and it's written to support you, never to judge you.

This article is for general information only and is not a substitute for personal medical advice. If you have a health condition, take regular medication, are pregnant, or have concerns about your weight or eating, please speak to your GP or healthcare professional before making significant changes. If you have had, or are preparing for, weight loss surgery, please follow the advice of your specialist team.

Dr Laura Coia is a GP Partner in NHS Scotland with over 25 years of clinical experience, and Co-founder and Medical Director of Raiys Digital Health.

Dr Izzy Howat is a Consultant Endocrinologist and NHS Weight Management Specialist, and Weight Management Lead at Raiys Digital Health. She is the author of the Raiys Weight Management Programme.

• National Institute for Health and Care Excellence (NICE) (2025). Overweight and obesity management (NG246). London: NICE. (Replaces CG189.)
• Scottish Intercollegiate Guidelines Network (SIGN) (2010). Management of obesity (SIGN 115). Edinburgh: SIGN. (Some recommendations may since have been superseded; read alongside NICE NG246.)
• Jensen MD, Ryan DH, et al. (2013). 2013 AHA/ACC/TOS Guideline for the Management of Overweight and Obesity in Adults. Circulation, 129(25 Suppl 2), S102–S138. Co-sponsored by The Obesity Society.
• National Institute for Health and Care Excellence (NICE) (2014). Behaviour change: individual approaches (PH49). London: NICE.
• Rubino F, Puhl RM, et al. (2020). Joint international consensus statement for ending stigma of obesity. Nature Medicine, 26, 485–497.
• Obesity UK. Guidance on non-stigmatising language and person-first care for people living with obesity. obesityuk.org.uk
• NHS England. Health Survey for England; and Scottish Government. The Scottish Health Survey. (Adult overweight and obesity prevalence.)
• British Obesity & Metabolic Surgery Society (BOMSS). Clinical guidance for patients undergoing bariatric surgery. Relevant only to readers who have had, or are preparing for, weight loss surgery; this programme is a non-surgical behavioural programme.