The Proof with Simon Hill

Food Labels, Fibre, and Ultra-Processed Foods: What Really Matters | Rhiannon Lambert

17 snips
Apr 28, 2026
Rhiannon Lambert, a registered nutritionist and bestselling author, breaks down food processing, fiber and label tricks in clear, practical terms. She explains limits of NOVA, why calorie labels mislead, and which additives merit concern. Learn quick label checks, simple low-effort cooking hacks, and which ultra-processed items to really watch.
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INSIGHT

NOVA Category Is Too Blunt

  • Ultra-processed foods (NOVA category 4) are a blunt group that lumps together very different products like ice cream, baked beans, and fortified plant milks.
  • Rhiannon Lambert explains that additives and food science make the category heterogeneous, so not all UPFs carry the same health implications.
INSIGHT

Food Matrix Alters Calorie Absorption

  • The food matrix changes calorie availability; processing often makes energy more absorbable and raises blood sugar and gut impacts.
  • Lambert uses ground almonds versus whole nuts to show processed forms can deliver 100% of calories vs ~60–70% from intact foods.
INSIGHT

Low Fiber From UPFs Linked To Bowel Cancer Rise

  • High UPF intake both reduces fiber and may contribute to rising bowel cancer, with diet preventing an estimated 60% of bowel cancers.
  • Lambert links low cooking rates, fiber depletion, and younger-age bowel cancer increases in recent decades.
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