Action is needed now to reduce ultra-processed food (UPF) in diets worldwide because of their threat to health, say international experts in a global review of research. They say the way we eat is changing - with a move away from fresh, whole foods to cheap, highly-processed meals - which is increasing our risk of a range of chronic diseases, including obesity and depression. Writing in The Lancet , the researchers say governments need "to step up" and introduce warnings and higher taxes on UPF