MFP is a great app. I looked at it, but I was primarily interested in tracking carbs when I started, so I went with CarbsControl. 140 lbs later, I can recommend the approach wholeheartedly.

There are several apps out there that essentially do the same thing, including some that have a UPC scaner to scan canned foods for nutrition info. But the key is to simply pick one and be religious about logging everything that goes in your mouth. It's amazing how much easier it is to have some will power when you see the numbers in black and white.

Hang in there!

BB