Depends upon how much you want to cook, but easy, filling but light would be;
Filled pasta (spinach/ricotta or the fancier beetroot and goats' cheese ones). Drizzle with olive oil when cooked. Serve on a bowl of mixed leaves, cheery tomatoes, cucumber, beetroot, spring onion, sliced radish with some olive oil/lemon juice/herbs and grate a small amount of strong cheese on top.
Baked sweet potatoes with cream cheese, loads of salad.
Jacket potatoes with cheese and salad.
Make chilli in the slowcooker (onion, browned mince, garlic, tin of beans with chilli sauce), have with rice and blue cheese tonight, leftover chilli with Jacket potato/sweet potatoes and salad tomorrow.
Make a thick tomato and vegetable stew (peppers, courgettes, aubergine, tin of tomatoes, tomato puree, onion, garlic) then have with baked chicken breasts sliced up and boiled potatoes, add chilli flakes and have with roast chicken thighs, white fish or tinned chickpeas added to it. Add curry paste and do the same with them.
Make soup. Vacuum packed beetroot, two boiled potatoes, stock and blitz. Cook sliced leek and blitz in stock with 2 boiled potatoes.
Vegetable curries.
You need fluid and fibre, plus nutrients. And to move around more to get your system working better.
Any of these useful or appealing?