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Descubre un mundo infinito de historias

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BBC World Service


The Food Chain examines the business, science and cultural significance of food, and what it takes to put food on your plate.


The Food Chain

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: thefoodchain@bbc.co.uk

Producer: Izzy Greenfield

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

Portion size: How much should you eat?

Listeners to BBC World Service told us they hate it when fellow diners chew noisily or talk with their mouth full. But what is polite at mealtimes can vary wildly according to where in the world you are and who you are with.

Ruth Alexander visits London's City of Westminster College to meet some of its teenage students, to find out about their different backgrounds and what good manners mean to them. She visits an exclusive private members club in the heart of London's West end to talk to Rupert Wesson, a director and coach at the British etiquette institution Debrett’s. And she hears from Japanese language tutor Chika Nakagawa about the rules that govern mealtimes in Japan.

Plus what if you are thrown into a world you weren't prepared for? After tough beginnings and through sheer determination Reggie Nelson built a career in finance. He tells Ruth about his extraordinary path to success and how he got through his first formal business dinner.

And what about when a restaurant meal brings out the worst in a customer? Mo Abedin, owner of Sticky Rice Thai restaurants in Dubai and Abu Dhabi talks about how he and his staff deal with the nightmare diners who have forgotten their manners.

Producer: Lexy O'Connor

(Image: A bearded man in a shirt and tie is eating a meal in front of a red background. He is shovelling a big fork full of noodles into his mouth whilst staring at his mobile phone. Credit: Getty Images/Group4 Studio)

Dining etiquette: What really matters?

Have you tried Dubai chocolate, hot honey or the fruit sando? They’re just a few examples of viral food trends which got everyone talking on social media. 

Rumella Dasgupta talks to creators and product developer to find out how much work goes into creating the next big thing in food. She hears how there’s often years of work behind the product that seems to suddenly be the latest craze. 

It might look as though some food trends go viral overnight, but entrepreneur Mike Kurtz explains how creating his brand Mike’s Hot Honey took years of hard work. Product developers Katie McDaid and Robert Craggs tell Rumella how their jobs involve travelling the world to find the next big thing in food. Plus chef and food writer Pierre Thiam, explains how he’s been working tirelessly for decades to bring the ancient West African grain Fonio to worldwide attention. 

We’d love to hear about the viral foods you’ve tried and what you thought of them. You can email the team at thefoodchain@bbc.co.uk 

Producer: Lexy O’Connor

How to set a food trend

Self-confessed crisp lover Ruth Alexander traces the story of the crisp or potato chip, starting with a tasting experience matching fine wines and “rubbish crisps” at a wine bar in the northern English city of Manchester. 

With the help of journalist and crisp historian Natalie Whittle, Ruth finds out about the commercial beginnings of the potato chip in the fine dining rooms of nineteenth century New York. She meets the chef who travels the world searching for new taste sensations to develop into a packet of crisps for snack giant Frito-Lays. Can you guess which flavours nearly, but not quite, made it onto the shelves? 

Ruth also talks to salty snack expert Jolene Ng of Mintel, who researches the role crisps play in modern life. And with Japan renowned for its unusual flavours, Ruth meets Makoto Ehara, the boss of one of the country’s biggest potato chip makers Calbee, who tells her about the threat climate change poses to the future of the potato chip industry. 

If you would like to get in touch with the show, please email: thefoodchain@bbc.co.uk 

Produced by Lexy O’Connor 

Photo: A woman in a bright pink jumper is smiling as she pushes a supermarket trolley through the potato crisp aisle. Credit: dowell / getty images

Flavour: The potato chip story

High prices, busy lives and the rise of intermittent fasting mean more people are skipping breakfast. This week, Ruth Alexander speaks to three experts in nutrition about whether that matters. She finds out what it’s best to eat for your first meal of the day and when is best to have it. 
 
Experts Courtney Peterson, a researcher in intermittent fasting and associate professor at the Harvard TH Chan School of Public Health in the United States.. Professor Alexandra Johnstone, a nutrition scientist based at The Rowett Institute at the University of Aberdeen in Scotland snd Marianella Herrera, an associate professor in public health nutrition at Central University of Venezuela and visiting lecturer at Framingham State University in the US, share their insights. 
 
If you would like to get in touch with the show, please email: thefoodchain@bbc.co.uk 

Producer: Izzy Greenfield
Image: A bowl full of cereal and a spoon (credit: Getty)

Should I eat breakfast?

Bottom trawling is one of the most widely used - and most destructive - fishing practices in the world. Dragging heavy nets across the seabed damages fragile ecosystems, depletes global fish supplies, and puts the livelihoods of small-scale fishers at risk.

In this episode of The Food Chain, Rumella Dasgupta speaks to John Worthington, one of the last remaining fishermen in Fleetwood, UK, who fears a proposed ban on bottom trawling in Marine Protected Areas could end his business. Fisheries economist Dr Rashid Sumaila of the University of British Columbia explains the global consequences of trawling, from overfishing to illegal and unregulated catches.

On the coast of West Africa, Aissata Daouda Dia, Head of Advocacy at Blue Ventures, tells us hom much coastal communities rely on local catch. Nana Kweigyah from the Canoe and Fishing Gear Owners Association of Ghana, describes how foreign industrial trawlers are devastating coastal communities. And in Malaysia, Adrian Poon of the Cinnamon Group explores the challenges of sourcing fish sustainably in a market dominated by cheaper, trawled seafood.

Producer: Izzy Greenfield 
Image: Getty

Bottom trawling and the future of global fish supplies

The quality of food in care homes for the elderly can be underwhelming. Ruth Alexander talks to the people highlighting the issue and finding ways to bring nutrition and comfort back on the menu. 

Dr Lisa Portner, a medical doctor and researcher at the Berlin Institute of Health at Charite, outlines the inadequate diet offered by three nursing homes she studied in Germany. 

Australian restaurateur and food writer Maggie Beer tells how she came to set up the Maggie Beer Foundation, which aims to research the issues, raise awareness and offer culinary training. 

Ronald Marshall explains the simple ways he found to help carers understand the food preferences of his mum, who was diagnosed with dementia in 2020. 

And Navjot Gill-Chawla recounts the conversations she had with South-Asian Canadians living with dementia and their families, as a PhD Candidate in Public Health at the University of Waterloo in Ontario. When the subject of care homes came up, she says food was uppermost in their minds. 

If you would like to get in touch with the show, please email: thefoodchain@bbc.co.uk

And if you'd like to try Maggie's brownie recipe featured in the show, you can find it in full on our website.

Producer: Beatrice Pickup 

(Photo: Two cooks in a care home kitchen are smiling as they prepare a tray of brigh orange roast pumpkin. Credit: Sam Kroepsch)

Making care home food better

From ancient Egyptian pyramid builders to French chefs, garlic has been prized, feared, and even used to ward off evil. In this episode, Rumella Dasgupta explores garlic’s journey through history and across cultures - from its medicinal roots and rich folklore to its starring role in kitchens worldwide. Featuring chefs, historians, and dietitians, we uncover how this pungent bulb became a global favourite - and ask the ultimate question: is garlic really good for us? 

Producer: Izzy Greenfield
Image: A bulb of garlic split in half to reveal cloves Credit: Getty

Garlic: Food or medicine?

The World Health Organisation says close to 60 million people are living with dementia; and there are 10 million new cases every year. But could what we eat help to prevent it?

Three guests who've been exploring the potential for diet to help prevent dementia tell Ruth Alexander about their findings. We hear from Professor Christy Tangney of Rush University System for Health in the United States – she co-created the MIND diet; Anne-Marie Minihane, Professor of Nutrition and Genetics or Nutrigenetics as it’s known, at Norwich Medical School at the University of East Anglia in the UK; and Dr Lizette Kuhn, a dietitian in Pretoria, South Africa.

If you would like to get in touch with the show, please email: thefoodchain@bbc.co.uk

Produced by Izzy Greenfield and Alistair Kleebauer

(Image: two sides of a brain; one made up of fruits and vegetables, and the other a sketch. Credit: Getty Images)

The anti-dementia diet

Dementia is a syndrome associated with a decline of brain function that can affect memory, thought processes and behaviour. In some cases this can impact people’s ability to shop, cook and eat a meal. The most common form of dementia is Alzheimer’s Disease. 

In this programme Ruth Alexander meets people living with dementia and their families, to hear about the ways in which a diagnosis can impact mealtimes. 

Ruth meets Alan and Amy Lambert in Manchester, England. Alan was diagnosed with Alzheimer’s Disease in 2024 and his daughter Amy lives with him. They share some of the techniques they’ve developed at home to support Alan. 

For Ruby Qureshi in Canada, cooking was a huge part of her life before being diagnosed with Alzheimer’s in 2020. Ruth hears how her husband Pasha Qureshi has joined her in the kitchen in a supporting role. 

Jo Bonser in Nottingham, UK shares her experiences of supporting her mother who lived with vascular dementia and in 2016 stopped eating and drinking. Jo has gone on to set up a company, Dignified Dining that offers training in this area. 

And Aideen McGuinness is a registered dietitian working in the Memory Assessment and Support Service in Country Wexford Ireland, and co-author of a guide on dementia and nutrition. 

If you would like to get in touch with the show, please email: thefoodchain@bbc.co.uk 

Produced by Beatrice Pickup. 

(Image: Alan and Amy Lambert sat at the kitchen table with a bowl of soup and plate of toast. Credit: BBC)

Eating well with dementia

Every day, humans make multiple choices about what to eat. Some of those decisions will be better for our health than others - but what if we allowed a machine to decide for us? 

In this programme, Adam Shaw explores what would happen if we let artificial intelligence (AI) design our diets and whether that might improve our health. 

Adam visits a laboratory in the UK to meet AI researcher Dr James Neil, from the Centre for Nutrition Education & Lifestyle Management, whose company is developing machine-learning systems to create personalised diets. 

He speaks to dietician Pennie McCoy, to find out how a digital therapist called ‘Hope’ is learning to help Australians stay on track with their weight-loss goals. 

Dr Mariette Abrahams, dietician and CEO of Qina, a company in Portugal which offers strategic advice on the personalised nutritional market, tells Adam about the potential and the pitfalls of the new tools. 

And Dr Eric Topol, professor of molecular medicine and executive vice president of Scripps Research in the US, considers whether AI-driven diets will be used for a small group of people, or whether the technology could fundamentally change everyone’s approach to food. 

If you would like to get in touch with the show, please email: thefoodchain@bbc.co.uk 

(Picture: A robot hand and a human hand both reaching out to grab an apple. Credit: Getty Images/BBC)

Presenter: Adam Shaw 
Producer: Elisabeth Mahy

How AI could design our diets

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