Your workplaces should provide you with some sort of a staff room, with space to do a bit of lunch preparation (microwaving something and dishing it up, or making a sandwich or some toast), and somewhere to wash up, and comfy chairs where you can sit and have your lunch or snack - so that the office isn't full of people's food smells or eating noises, and so that people can actually get away from their desks and relax whilst they have their lunch or break.