If you want to truly understand what you are eating and how hard you are working out, keep a journal of both. This will help your evaluate your patterns, and more importantly, how you feel daily.
Keeping a journal will also keep you accountable for what you are eating and how hard you are working out. After a little while your mind will start to think about the consequences of eating an ice cream sundae because you will have to write it in your journal later on.
Also write down how you felt during the day. You can review your journals to see what you did and how you felt as a result of your eating and training. For example, you can see every time you had an afternoon doughnut, you felt tired afterwards.
Write in your journals throughout the day to make sure you don’t forget anything. To make it less obvious to those around you, purchase a nice journal.