"I am not a chef. I am not even a trained or professional cook. My qualification is as an eater." So writes Nigella Lawson in the preface to her first book 'How To Eat', published 20 years ago.

Presenter Charlotte Smith puts down her beloved Kit Kat to discover a world of rich, bitter and often rather pricey chocolate as she explores how small producers and big manufacturers are adapting to demands for less sugar and less dairy but hopefully not less fun. She asks what this means for growers and for us when we pick up a bar for a pick me up.

Rachel Roddy and Sheila Dillon share their love of Sweet Chestnuts and find out how they're for so much more than just roasting over an open fire. Like a lot of people Rachel's first memories of Chestnuts is as stuffing for turkey, but when she moved to Rome in 2005 where there was a Chestnut seller on every corner she embraced Chestnuts as an ingredient. She and Sheila discuss the soups, cakes and stews that are made using Chestnuts and how for one restaurant-owner they're a hero ingredient which saved a population from starvation.

Fabio Parasecoli, Professor of Food Studies at the New York University explains why Chestnuts were so important to the Italian region of Abruzzo and how he still makes his Grandmother's Chestnut and Chickpea soup on Christmas Eve. Martin Crawford of the Agroforestry Research Trust in Dartington sells 750Kg of Chestnuts a season and explains why he would like UK producers to challenge the imports from Italy, France, Portugal and increasingly, China, and Simon Melik from Besana UK gives an overview on the industry.

Producer: Toby Field

Sheila Dillon is joined by cook and food-writer Chetna Makan, Tom Tivnan from The Bookseller’—the book industry’s bible, and Kate Young who won the Guild of Food Writers Blogger of the Year award in 2017 discuss the cookbooks of 2018. The list includes books by Diana Henry, Caroline Eden, Thom Eagle, Bosh!, Yasmin Khan and Snoop Doggy Dogg. They also discuss the inspiration for writing a book, how the books are produced, and the role social media plays in deciding who gets a book deal and how the books are produced and marketed. Rachel Roddy also gives her favourites of the year.

There are also nominations from Mitch Tonks, Olia Hercules, Russell Norman, Bee Wilson and Paula McIntyre.

Producer: Toby Field

Food as part of a prescription for health and wellbeing. What has gone wrong with our diets in the UK and how are doctors and experts trying to redress the balance to get us well again. Sheila Dillon and a group of food, diet and medical experts continue the discussion with contributions from Dr Rangan Chatterjee, BBC's Doctor In The House, Professor Tim Spector author of the Diet Myth, Henry Dimbleby who drew up the School Food Plan and Dr Rupy Aujla, founder of the Dr's Kitchen.

Producer: Maggie Ayre

The Food Programme invites a panel of four to discuss the merits of a low versus high carbohydrate diet. Following up on the issues raised in discussing the government's dietary advice in the Eatwell Guide a panel including Duane Mellor of the University of Coventry, Fiona Godlee of the British Medical Journal, Dr Trudi Deakin and Anthony Warner aka the Angry Chef try to answer some of the questions and bust some of the myths about carbohydrates.

Producer: Maggie Ayre

Food writer, chef and presenter Genevieve Taylor tells the story of how Cambodia’s cooking history was almost lost in the genocide that saw millions die in the mid-1970s. While food from its neighbours Thailand and Vietnam was spreading all over the world, Cambodia’s finest dishes were side-lined or lost. In the UK, there are just three restaurants focussing on Cambodian cuisine. Now, slowly but surely its traditional dishes are making a comeback.

Genevieve goes to Cambodia in search of the ingredients that make up its distinct flavours and in the UK she talks to Y Sok who runs two Cambodia restaurants in Marple and Altrincham, she meets Simon and Kamya Allen from the Khmer Kitchen in Somerset and she hears the story of Longteine de Monteiro, a chef who fled the Khmer Rouge regime and set up Cambodian restaurants in France and the US.

How Instagram changed food - with journalist George Reynolds and Anissa Helou, the author of Feast.

The photo above was taken by Matt Inwood who runs masterclasses on taking better photos on your phone.

The producer in Bristol is Miles Warde

Following the recent high-profile cases involving food allergy deaths, Bee Wilson investigates whether labelling needs to go further to protect allergy sufferers. Bee asks if the growing number of people suffering from food allergies could be due to our diet and finds out how food production and labelling might change following the death of Natasha Ednan-Laperouse who had a severe allergic reaction to Sesame after eating a baguette from Pret a Manger.

Bee speaks to Michelle Berriedale-Johnson and Professor Chris Elliott about the state of current food regulations and the frustrations of the 'May Contain...' label. Dr Adam Fox and dietitian Lucy Upton talk through the probable causes of food allergies and why they're increasingly prevalent in young people. Bee visits Vita Mojo whose use of digital menus offers their customers pinpoint accurate information about which potential allergens are in which dish. Kerrie Foy describes the shock of discovering that her daughter Bluebell may have a peanut allergy and describes how it's turned their lives upside down.

Producer: Toby Field

After the summer heatwave, Master of Wine Susie Barrie meets winemakers bringing in what could be a watershed harvest for homegrown wine. On a tour of the south of England she visits Peter Hall who's been making wine for 40 years in his isolated Breaky Bottom vineyard in East Sussex. Just down the road we visit sparkling wine makers Nyetimber and Ridgeview, we get a lesson in winemaking from Sarah Midgley at Plumpton College and then to Frazer Thompson of Chapel Down in Kent and Patrick McGrath of Hatch Mansfield in Ascot who helped Champagne Taittinger plant vines in the UK.