Today’s bonus guest is Dr Chris van Tulleken, he's the author of the bestselling book Ultra Processed People, an infectious diseases doctor and broadcaster. Now for anyone who’s been listening to Big Fish for a while, you’ll know that this book absolutely changed my life. It’s an eye-opening exploration into ultra processed food and why we can't stop eating it. He looks at how this industrially processed food is designed and marketed to be addictive, why exercise and willpower can't save us and what UPF is really doing to our bodies and our health. I absolutely loved this conversation with Chris - you’ll find it utterly fascinating.