Hi OP, I posted on your other thread but I've now found the laptop so can post in a bit more detail!
I find it easier to use the key nutritional rules I've picked up from reading health websites (including NHS). So, I always try and get 5-7 portions of fruit and veg a day. A portion is what you can hold in one cupped hand (ignore what it says on the packets - I find that super confusing). I try to get 1-2 portions of fish a week. Usually tuna mayonnaise, or maybe mackerel pate (DH likes tinned mackerel in tomato sauce, which I think is disgusting, but tinned fish all counts). I was overweight because of snacking too much, so now I try and focus on making sure I have extra protein and green veg in meals, to keep me full so I snack less.
It is easier when you have a larger budget (to cheat with shortcuts), but a week might look like this:
Breakfast - same breakfast every day (banana, pecan nuts, 2x dessert spoons Yeo Valley 0% kerned yoghurt (I choose this because it has 0% fat, no added extras, but a lot of protein - normal Greek yoghurt will also have the protein, but will have more fat in it), frozen fruit of some kind. You can blast frozen fruit in the microwave for 30 seconds to change the temperature / texture. The yoghurt and nuts are expensive but worth it to me (due to allergies / need for extra protein) and I try and keep the rest of the meals cheaper.
Mid morning - very milky coffee (calcium intake very important in women, to protect against osteoporosis later on)
Lunch - cheese sandwich, 2-3 vegetables, e.g. raw peeled carrots, tomato, cucumber sticks, pepper sticks, cooked beetroot, cooked broccoli / green beans / spinach (sometimes with olive oil, or lemon juice, or balsamic vinegar on). Green veg are very important. Adding olive oil to them (not loads, just a small drizzle), or eating them with something like cheese helps your body absorb the nutrients better.
Dinner - I eat a jacket potato at least twice a week (wrap in a bit of kitchen paper, microwave between 8 and 10 mins until it feels done when you stab a fork in it (should go into the middle softly)). You can do loads of different fillings. Pizza is fine (had pizza this evening - I added 2x handfuls of chopped lettuce on the side).
I realise I've gone on. I wasn't joking when I said I'm a bit obsessed with food, meal planning, cooking etc. If you have any questions, or you want to share what you like / dislike in a bit more detail, then I can give some more tailored ideas and provide links to recipes or books you can get in the library?
When I've been really struggling and living by myself I usually ate a lot of tinned soup, vegetable sticks and rice cakes. Not the best diet in the world, but not the worst either. And a lot of pasta salad, which you can make hot or cold and add all sorts to.