Why Only 4% of Us Get Enough Fiber and Why It Matters Way More Than You Think

Registered nutritionist and bestselling author Rhiannon Lambert joins host of the Good Food podcast, Samuel Goldsmith, to tackle one of the most overlooked nutrients in our diets: fibre.

In this episode, Rhiannon explains why the UK is facing a fibre crisis, how ultra-processed foods reshaped the way we eat, and what the latest science says about gut health, longevity, and disease prevention. She also shares her simple 30/30/30 formula for getting more fibre without overhauling your life, plus the truth about supplements, sugar swaps, and nutrition myths that won't go away.

In this episode, you'll learn:

• Why fibre is about far more than digestion. From heart health to cancer prevention to living longer

• How the rise of convenience food left us eating less fibre than during WWII rationing

• The NOVA scale: what "ultra-processed" actually means (and why baked beans aren't the enemy)

• Rhiannon's 30/30/30 formula for hitting your fibre target one meal at a time

• Which supplements are genuinely worth taking and which ones are overhyped

• Why less than 2% of nutrition advice on TikTok is accurate

About the guest: Rhiannon Lambert is a Harley Street registered nutritionist, founder of Rhitrition, and author of The Fiber Formula and The Unprocessed Plate. She's known for cutting through wellness noise with clear, evidence-based advice.

📖 The Fiber Formula is out now.

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