Just to add on what ExercisePhysio said about the blogging. It is also good to record your feelings,
energy levels etc throughout the day. That way you can look back through the days and see that you ate (food) and you felt more energized throughout the day opposed to when you at (other food) and fely sluggish afterwards. The more energized you are the more work you can put into exercising and everything else. Try to gravitate towards the foods that make you feel good and keep you energized. It's easy to tell right after you've eaten something how it effected you but the next time it is an option you might choose it again because it tastes good...but if you see how it affected you the last few times you had it...you might choose something different (or that again if it made you feel good)
Just a suggestion.
