My staples have been eggs (eaten with either mushrooms and tomatoes, or with avocado), greek yoghurt (very nice with cinnamon), frozen salmon fillets, the ingredients for Greek salad (nice tomatoes, cucumber, red onion, oregano, feta, stuff to make a vinaigrette and olives or diced peppers if I fancy them), and loads of courgette. I tried making courgette pasta and cauliflower rice, but it turns out I really can't be bothered. Instead I just slice courgettes and either steam or roast them, then eat in place of pasta or rice. It's nothing like rice but I'm perfectly content to eat it.
For snacks, I eat some nuts, but would suggest that you go for unroasted and unsalted mixed nuts -- they're less hyperpalatable, so it's much easier to only eat a few. A slice of cheese is pretty satisfying too. I know the theory is that we should have a stash of pre-boiled eggs, but I've never managed that level of organisation . . . basically I've learned that if I'm really hungry, I need to go straight for something with a bit of fat and protein, rather than reverting to my more traditional carby snacks. They don't help, and I feel bad for eating them.
I've started getting a weekly produce box again too. The pressure to use it all up helps me focus my meals around veg! I like the Abel and Cole super speedy veg box.
As for exercise, I relied on the school run. I've reverted to my natural state slug-like state now that school's broken up. Not great . . .