Have you ever tried MyFitnessPal for tracking your food.
I found it best to log a normal week, just being absolutely honest about what you are consuming, food and drink.
That way you can see how many calories a normal day includes for you, and how you consume them. Are you racking up loads of calories by having 6 cups of tea with 2 spoons of sugar? That kind of thing.
It also breaks down for you what percentage of your diet is carbs, protein and fat.
Once you know what you're diet looks like for real you can decide what you need to cut down on.
For me I find if I reduce carbs I lose weight, so I cut sugar from my coffee, only eat pasta once a week and don't have bread/crackers. I've also really upped my veg intake, mainly green beans, asparagus, broccoli, mushrooms and baby corn and reduced fruit.
I've just hit 20lb loss, loads and loads and loads left to lose but it's working.