I'm a creature of habit and my lunchtime meal is usually the same:
1/2 can of chickpeas, blitzed up to make a dip
2 whole peppers, sliced
3 whole celery slices, halved
This is around 250 calories and 7 portion of vegetables, according to the NHS 5 a day portion sizes. Sometimes I add stuff to the chickpeas - tuna and sweet corn, beetroot, cooked spinach or other leftover cooked veg.
I don't tend to eat breakfast. I tend to be thirsty in the morning rather than hungry. So I'll have a litre or two of water and several coffees through the morning.
Dinners, I have 4 children so they tend to be family meal type things. But I always cook from scratch. We eat a lot of "meat and 3 veg" type meals. Just with joints, steaks, chops, fish or whatever and steamed veg.
Also things like spag bol (peppers, onion, chopped tomatoes, tomatoes puree - all blitzed to smooth because my children are mardy about "bits", then add mince and grated carrot). DH and I just have bolognese sauce without the pasta.
I often do a BBQ chicken (3 peppers, passata, tom puree, chicken stock, whizzed to smooth, then add worstershire sauce, soya sauce, chicken and any green veg to hand) serve with rice or a side of vegetables.
We all like quorn, its great low fat protein. So I do at least 1 vegetarian meal a week.
HTH