An event publication that promises to change how we eat, saving ourselves and the planet at the same time. The Third Age of Eating is a fast paced and eye-opening book which reveals the true cause of both obesity and poor health; ultra-processed food - or UPF. Van Tulleken delves into the science and economics of UPF, reframing obesity as a "commerciogenic disease" driven by an unregulated industry and caused by the consumption of knowingly harmful, addictive substances. It is not a diet book, but it may lead to weight loss; it is not an environmental treatise, but it will help the planet. The book will use evidence to propose real solutions to the current obesity epidemic, both for policy makers and for readers. Threaded throughout is a highly engaging personal account of the author´s own confused relationship with UPF as a doctor, parent and sibling.