Well done for recognising it, OP. Yours obviously rushed off your feet.
You really do need to eat proper meals though, and fit in lots of fruit and veg - else you could end up with all sorts of health issues, and you’ll feel exhausted from lack of proper nutrition.
Try whole meal toast for breakfast- if you’re in a rush grab it as you leave and eat it en route, take a banana in your handbag. Or a pot of porridge from a cafe. Easy to make porridge at home, but needs five minutes to cool.
For lunch buy a pot of soup from the canteen or another whole meal sandwich, or make yourself a sandwich and pack an apple and a yoghurt in a lunch box while you make your morning toast - or make it the night before and keep it in the fridge.
Dinner (easy, minimal cooking)- baked potato, salad and ham and new potatoes, poached fish (literally just drop a salmon fillet in to a pan of cold water, bring up slowly to a simmer then remove after five minutes simmering, serve with salad or broccoli and boiled potatoes), pasta and a jar of sauce with cheese on top, or make a tray bake by shoving a pack of chicken thighs in the oven with some new potatoes- let it bake while you have a shower etc.