Have found the app 'myfitnesspal' incredibly useful in tracking what I eat. The food database is huge, and anything that you can't find can be entered in and saved. It even has a barcode scanner to just scan the code of what ever you eat.

As part of my mass/muscle gaining regime I have found it invaluable in learning portions etc, and how much I need to eat to maintain and build my physique. My diet demands 3400 calories per day, with guidelines for carbs, protein and fat intake as a percentage.

So far that app is helping me stick to this target, hopefully I see some quality gains together with new 4 day per week gym schedule.