I'm so bad at that. Just have no real motivation to cook for myself (love cooking for others) so with living alone and working long days, eating proper meals just doesn't happen very often for me.
Not really a breakfast person and don't usually have anything, don't tend to eat much during the day generally, often just grab some soup and/or a crusty roll at lunch, often buy a seed snack bar with nuts in it if I'm feeling peckish.
I'm usually out of the house before 7 on a work morning, in work by 8 then get out at 6 at the earliest, often after 7, so by the time I've walked to the shop to pick up something for tea my motivation to make an effort has disappeared, let alone for preparing it by the time I've got the bus home and it's already 8/9pm.
It is laziness and I really should make more of an effort to do a proper big shop in a decent sized supermarket (not the mini ones in town with limited choice) once a week to get a load of fresh stuff and cook up batches of meals to fridge/freeze and eat through the week.
I have periods of making more of an effort, getting veggies I can steam quick in the microwave and some meat I can do on the George Forman but tend to revert to quick microwave fixes.