Around the world, the risks of developing diet-related health issues such as Type 2 diabetes, obesity and cardiovascular disease are rapidly rising. We're in the middle of a food crisis, but we can't stop eating," says British-Canadian medical doctor Chris van Tulleken in the documentary Foodspiracy. "The evidence is increasingly clear that pre-prepared, packaged, highly processed food is linked to weight gain and obesity, some cancers, dementia, Type 2 diabetes and early death from all causes," van Tulleken says. UPFs are usually cheap and convenient. They've also been engineered to be, quite literally, irresistible by corporations with access to teams of scientists and cutting-edge technology. "The theory is because you're expecting protein that never arrives, you kind of reach for the next chip or the next forkful of noodles because you're going, 'Well, where? Why? Why didn't I get the nutrients?'" says van Tulleken. As a result, we eat " and buy " way more than we should, simply because our bodies don't understand how much we've actually eaten. This is called "vanishing caloric density." It's not just the taste and texture of ultra-processed foods that leave you wanting more: it's everything. "It has all been engineered to get you to eat more," says van Tulleken. "From the pictures on the boxes, all the way through to the mouthfeel, the way it cuts ... the viscosity. There's the ad, the jingle, the cartoon characters. All of it is ultra-processing."