For breakfast, I would have 30g of porridge oats (114 cals) with 125 ml skimmed milk (43 cals), half a banana (50 cals), and a teaspoon of peanut butter for protein (40 cals)
Lunch a small bowl of salad made of lettuce, cucumber, cherry tomatoes, a tiny helping of beetroot, onion, 6 ocean sticks and a splash of Hellmann's 3 calorie salad dressing for 170 calories.
Dinner was an omelet made with 2 medium eggs, onions, and mushrooms and served with a handful of fresh spinach for (200 cals)
Thats enough food if you’re fat. Probably more food than lots of people in the world are getting. If you the same food everyday though of course you’ll miss nutrients .Look at the MacDonalds diet. There are many other vegetables , soups, fish nuts and salads you could swap in and get 800 calories.
The real point is getting to grips with not eating for the sake of it. Because it tastes nice, because it’s lunch, because you’re bored, because it’s on your plate, in the fridge, in the cupboard. It’s learning that eating just enough is fine.