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The Fibre Formula : Feed Your Gut, Support Immunity & Live Well for Longer - Rhiannon Lambert

The Fibre Formula

Feed Your Gut, Support Immunity & Live Well for Longer

By: Rhiannon Lambert

Hardcover | 9 June 2026 | Edition Number 1

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Discover the power of fibre with industry-leading nutritionist and Sunday Times bestselling author Rhiannon Lambert

"This book is a comprehensive guide for something I’ve been passionate about for over a decade: understanding the importance of fibre for our gut health – and how to eat more of it every day." – Tim Spector

"If your goal is to have a healthier body and mind, this is the book for you." – Joe Wicks

Goodbye high-protein, hello fibre!

The importance of fibre in our diet and its impact on our overall health cannot be understated, yet 96% of us aren't consuming enough.

Sunday Times bestselling author and industry-leading nutritionist Rhiannon Lambert is here to unpack the benefits of fibre, and outline the growing recognition of the importance of good gut health on alleviating a wide range of common complaints and health conditions. The solution is simple: 30g of fibre a day + eating 30 different plants a week will drastically improve short-term discomfort and fatigue, and lead to a much lower risk of developing more serious health conditions in the future.

Alongside this clear formula Rhiannon offers 60 minimally processed recipes.

Recipes include:

  • Breakfasts: Potato farls with an avocado smash, Barley porridge with blackberry and bay compote

  • Nutritious lunches: Coronation Brussels sprouts & chicken salad; Veg-filled summer rolls

  • 30-Minute Dinners: Green butterbean mac & cheese, Steamed cod & white beans

  • Fibre-filled Twists on a Classic: Champion chocolate chilli, Baked aubergine Milanese

  • Snacks: Vegetable bhajis with coriander chutney, Popcorn – 3 ways

  • Desserts: Chickpea blondies with tahini & raspberries, Rice pudding with salted pear compote

With plant points and macronutrient figures included for every recipe, this book empowers everyone to get the formula right and hit their recommended 30g of fibre every day.

"Fibre sits at the heart of so much of our health, yet it’s been quietly overlooked while the conversation has been dominated by protein and quick fixes. Rhiannon’s book brings it back into the spotlight in a way that’s clear, accessible and incredibly timely." – Ella Mills

About the Author

Rhiannon Lambert is a Sunday Times bestselling author, one of the UK's leading Registered Nutritionists, and founder of Rhitrition, a private nutrition clinic in London. Rhiannon is the host of the "Food for Thought" podcast, and the co-host of "The Wellness Scoop" with Ella Mills which explores and dissects the latest wellness news every week. Rhiannon holds a first-class degree in Nutrition and Health, a Master's degree in Obesity, Risks, and Prevention, and diplomas in sports nutrition, and in pre- and post-natal nutrition.
Industry Reviews
We’re living at a time when we’re eating fewer vegetables and more ultra-processed foods than at any point in the last fifty years. Fibre sits at the heart of so much of our health, yet it’s been quietly overlooked while the conversation has been dominated by protein and quick fixes. Rhiannon’s book brings it back into the spotlight in a way that’s clear, accessible and incredibly timely. I can’t wait to see the impact it has.

Ella Mills

This book is a comprehensive guide for something I’ve been passionate about for over a decade: understanding the importance of fibre for our gut health – and how to eat more of it every day.

Tim Spector

Addressing fibre deficiency is a public health priority. This book helps to bring the latest science and practical tips to more people to improve their health.

Dr Federica Amati

If your goal is to have a healthier body and mind, this is the book for you.

Joe Wicks

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