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The Fiber Formula

Eat Your Way to Better Health Through the Power of Fiber

Hardcover
7-7/16"W x 9-11/16"H | 20 oz | 1 per carton
On sale Jun 16, 2026 | 224 Pages | 9798217306503

APPROVED B2B

Fiber is often the most overlooked of the macronutrients, yet it is more powerful than most life-saving drugs.

For too long we have focused on high-protein, low-carb diets but fiber's importance to our diet cannot be understated. Fiber is what feeds our gut microbes, directly impacting immune health, and improving the gut, which, as we're increasingly coming to understand, dictates so much of our overall wellbeing, both mentally and physically.

When we extract the nutrients we need from the food we eat, the fiber (prebiotics) go to the microbes which then produce postbiotics. These have a major anti-inflammatory impact throughout the body, impacting mood, skin, longevity, and much more. Fiber also plays an integral role in regulating blood sugar, keeping us fuller, and helping with weight and diabetes prevention. Overall, it’s a vital part of our diet, and one we're only starting to truly embrace.

Over 80% of the immune system resides in the gut, so in addition to providing over 70 nourishing recipes and food swaps, Rhiannon outlines the importance of gut health, and the impact our food has on alleviating symptoms of hormonal imbalances, immunity issues, and common gut and skin complaints. With this book Rhiannon is driving the conversation to help people start making more informed choices and eating the right foods now.
Rhiannon Lambert is one of the UK’s leading Registered Nutritionists, Sunday Times bestselling author and founder of Rhitrition, a private nutrition clinic in London. Rhiannon is the host of the ‘Food for Thought’ podcast, which has surpassed over 10 million listens, 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. She is a Master Practitioner in Eating Disorders, accredited by The British Psychological Society, and a Level 3 Personal Trainer. View titles by Rhiannon Lambert
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About

APPROVED B2B

Fiber is often the most overlooked of the macronutrients, yet it is more powerful than most life-saving drugs.

For too long we have focused on high-protein, low-carb diets but fiber's importance to our diet cannot be understated. Fiber is what feeds our gut microbes, directly impacting immune health, and improving the gut, which, as we're increasingly coming to understand, dictates so much of our overall wellbeing, both mentally and physically.

When we extract the nutrients we need from the food we eat, the fiber (prebiotics) go to the microbes which then produce postbiotics. These have a major anti-inflammatory impact throughout the body, impacting mood, skin, longevity, and much more. Fiber also plays an integral role in regulating blood sugar, keeping us fuller, and helping with weight and diabetes prevention. Overall, it’s a vital part of our diet, and one we're only starting to truly embrace.

Over 80% of the immune system resides in the gut, so in addition to providing over 70 nourishing recipes and food swaps, Rhiannon outlines the importance of gut health, and the impact our food has on alleviating symptoms of hormonal imbalances, immunity issues, and common gut and skin complaints. With this book Rhiannon is driving the conversation to help people start making more informed choices and eating the right foods now.

Creators

Rhiannon Lambert is one of the UK’s leading Registered Nutritionists, Sunday Times bestselling author and founder of Rhitrition, a private nutrition clinic in London. Rhiannon is the host of the ‘Food for Thought’ podcast, which has surpassed over 10 million listens, 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. She is a Master Practitioner in Eating Disorders, accredited by The British Psychological Society, and a Level 3 Personal Trainer. View titles by Rhiannon Lambert
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