Unhealthy, ultra-processed food: most of us keep eating and buying it, despite knowing that it is not good for us. For some products, the urge to eat is so strong that once the bag is open, it will be empty in a short time. For me, this is the case with chips. Once the bag is open, the sad realization that I’ve eaten everything follows quickly. But what makes this ultra-processed food so irresistible?