well, we loosely follow paleo diet so if you have a look at 'Mark's daily apple' on t'internets that would be a good start. Basically, try and avoid anything that's been 'made' IYKWIM by someone else, generally things that come ready made - anything from ready meals to cakes/pasta/bread etc. I don't measure anything, I can't cope with that but my husband keeps a list of everything he eats on My Fitness Pal, just because he's interested really, it doesn't stop him eating anything much.
Things that worked for me were:
- increase protein, so instead of cereal for breakfast have scrambled eggs/avocado or smoked salmon or protein shake with nuts/seeds or fruit
- snack on things like feta cheese, cherry tomatoes, nuts/seeds
-lunch have a massive salad with lettuce, beetroot, chicken, turkey or fish
-dinner have some sort of meat and veg (loads of veg). We tend to roast veg a lot, its quick and dead easy, just chop up a red onnion, a couple of peppers, courgette, garlic, cherry tomatoes - it's lush!
We tend to steer away from root veg and go for things like courgette, leafy greens (baked kale is AMAZING), peppers etc. We eat a lot of broccoli, sprouts and make cauliflower rice instead of using actual rice. Its a different way to get another veg in and means you aren't getting the ridiculous amount of carbs you are with normal rice. Ummmmm, cook with coconut oil rather than olive oil and most definitely don't cook with any other type of oil (think veg or sunflower etc).
Husband swears by having strong black coffee before working out for a bit of a boost. I don't, not my thing but might work for you?