Keep A Public Journal
This entire forum is devoted to Personal Logs. You can start your own log and keep a journal of your food, your exercise habits, the difficulties you are facing, or simply talk about yourself and what is going on in your life. Other members will 'visit' to chat, encourage and offer advice. In addition, you can visit other members logs and make some great new friends.
OR... Keep A Private Journal
If you prefer, you may also keep a private and confidential journal - which only you can access - to record your daily food intake, exercise and thoughts.