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  • Published: 24 March 2026
  • ISBN: 9781761356728
  • Imprint: Penguin
  • Format: Trade Paperback
  • Pages: 288
  • RRP: $36.99

The Fibre Factor

A Science-backed Guide to a Healthier Gut, Stronger Heart and Sharper Brain




The ultimate guide to better gut health, brain function and whole-body wellness through the power of fibre.

We didn’t mean to lose fibre – but between industrial food processing and convenience culture, it quietly disappeared from our plates . . . and our bodies have noticed.

Drawing on the latest science and nearly three decades of experience as a nutrition scientist and TV personality, Dr Joanna McMillan brings fibre back into focus – not as a dull dietary box to tick, but as one of the most deliciously powerful tools for health and longevity.

You’ll discover:
- how fibre fuels your gut microbiome, and supports digestion, mental health, immunity, inflammation and detox pathways
- why fibre is vital for heart health, weight balance and blood sugar control
- your dream team of foods, meal ideas and flavour-packed recipes to make eating fibre easy and inviting
- the tools to design your own fibre-rich way of eating that suits your lifestyle
- why fibre diversity – not just quantity – is essential.

Whether you’re an omnivore, a plant lover or somewhere in between, The Fibre Factor will inspire you to rethink your diet and rediscover the missing nutrient your body – and mind – have been craving.

  • Published: 24 March 2026
  • ISBN: 9781761356728
  • Imprint: Penguin
  • Format: Trade Paperback
  • Pages: 288
  • RRP: $36.99

About the author

Joanna McMillan

Dr Joanna McMillan is a PhD-qualified nutrition scientist, dietitian, food futurist and one of Australia’s most trusted and dynamic health experts. Originally from Scotland, Jo swapped kilts for sunnies more than 25 years ago and has become a familiar face on Australian TV, hosting Good Chef Bad Chef, ABC Catalyst and appearing regularly on The Today Show for two decades. A born communicator, Jo makes the science of nutrition deliciously entertaining, combining her passion for food with a talent for storytelling. She’s an accomplished author, a sought-after speaker and a firm believer that good health starts with joy on your plate.

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Praise for The Fibre Factor

Delivered with Jo’s usual easy to read style, this book makes getting enough fibre easy! An essential resource for everyone looking to improve their gut health, heart health and more!

Dr Ginni Mansberg

For years I’ve called fibre the forgotten nutrition hero, and Dr Joanna McMillan has finally given it the spotlight it deserves. The Fibre Factor is Joanna at her finest: deeply researched, utterly readable and delivered with her trademark blend of warmth, wit and scientific rigour.

Lisa Donaldson, Accredited Practising Dietitian

Australia’s favourite nutrition scientist and dietitian, Dr Joanna McMillan, has done it again. Joanna is renowned for turning complex science into practical, engaging guidance that resonates with people across the country. In The Fibre Factor, she uncovers the critical role of fibre – a nutrient that supports gut health and so much more – and brings it to life with her trademark charm.

Maree Ferguson, Founder of Dietitian Connection

Jo McMillan is a world-class communicator who makes complex science make sense. Though fibre might not be the sexiest nutrient, this fabulous book reveals why it is fundamental for good health.

Sarah Berry, Lifestyle & Health Writer at The Sydney Morning Herald and The Age

The Fibre Factor is your modern-day encyclopedia of fibre. It’s a brilliant blend of science, fascinating history, practical tools and cheeky fun facts. If anyone can make fibre sexy, it's Dr Joanna! She shows you why fibre is a top nutrient of concern in our diets, giving you the biggest return on investment for your health and it will forever change the way you see fibre on your plate.

Dr Flavia Fayet-Moore, CEO FoodiQ Global

A powerful reminder that what nourishes the gut also nurtures the mind. Dr Jo McMillan makes the science of fibre interesting, accessible and profoundly important.

Professor Felice Jacka OAM
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