I love Tandoorichicken's 3 rules:
"1) eat real food - more vegetables, moderate meat, moderate fruits, less grains, less sugar, less vegetable oils.
"2) exercise - moderate intensity cardio, sprinting, heavy lifting, dedicated stretching and mobility.
"3) live - relax, de-stress, meditate."
So you don't need a "diet." By entering your foods in FitDay you can see what you're getting from the foods you eat and then make incremental changes to be more healthy.
FitDay shows you the amount of calories it takes to maintain your current weight based on your lifestyle, and as long as you take in fewer calories than that you will lose weight over the long haul.