Intermitted fasting[1] and lifting weights 3 times a week[2] and being on a cutting regime[3] (cutting on the rest days with low carb and loading on the workout days wiht more carbs).
In the beginning IF was quite difficult but after a while the body get used to it and also I tend to have less cravings during the day. On the loading days/workout days I often have a hard time to get enoug calories because I feel full. I am using MyFitnessPal to track what I eat but it's more about the macros and not so much about the exact calories (but it's also good to get a feeling how much calories different kinds of food has)
[1] http://www.leangains.com/2011/03/intermittent-fasting-for-we... [2] http://stronglifts.com/ [3] http://www.lgmacros.com/standard-leangains-macro-calculator/