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The Food Chain
Portion size: How much should you eat?
The Food Chain
Oct 1, 2025

How much food is the “right” amount - and why is it so hard to work that out?

Ruth Alexander explores the world of portion sizes, starting with the rise of “portion distortion” in the United States, where supersized sodas and giant restaurant plates became the norm. Nutritionist Lisa Young explains how this shift happened, and what it’s meant for public health.

In São Paulo, dietitian Marle Alvarenga shares new research comparing Brazil, France, and the US, revealing how culture and globalisation shape what feels like a normal portion. Why are French plates so much smaller - and meals so much slower - than in Brazil or America?

And psychologist Lenny Vartanian in Sydney explains the powerful pull of portion size on our behaviour: why bigger servings make us eat more, even when we know better, and why education alone isn’t enough to change our habits.

If you would like to get in touch with the show, please email: [email protected]

Producer: Izzy Greenfield

Photo: Three spoons showing different portion sizes (credit: getty)

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Apr 1, 2026
Is kitchen culture changing?

Is the culture of professional kitchens shifting?

In recent weeks, one of the restaurant world’s most influential figures stepped down amid allegations about his conduct at work. It’s been widely reported that former employees accused René Redzepi, founder of Copenhagen’s Noma, of creating a toxic working environment involving verbal and physical abuse. Redzepi has since apologised publicly, saying he has worked to change.

Ruth Alexander uses this moment as a starting point to explore a broader question: what is, and what should be, the culture inside professional kitchens?

For many chefs, stories of gruelling hours, intense pressure and explosive tempers have long been part of the industry. But are those conditions still the norm today, or is a different kind of kitchen culture beginning to take shape?

Ruth is joined by three chefs from different generations and parts of the world, each reflecting on their own experiences of coming up in the industry, and how those experiences have shaped the way they run their kitchens now.

Jun Tanaka, chef-owner of Michelin-starred restaurant The Ninth in London, looks back on starting out more than three decades ago. Preeti Mistry, executive chef at Silver Oak in California, shares her perspective after 25 years in the industry. And Manon Fleury, head chef at Datil in Paris and co-founder of an organisation working to prevent violence in kitchens, explains why she believes change is both necessary and possible.

They discuss whether the old hierarchies and harsh environments are being left behind, what a healthier kitchen culture could look like, and what still needs to change.

If you would like to get in touch with the show, please email: [email protected]

Producer: Izzy Greenfield Sound engineer: Annie Gardiner Image: credit - getty


26min 29sec




Portion size: How much should you eat?

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