The notes you enter on SparkPeople or in a written journal will help you detect habits or patterns that can be improved. This will allow you to change patterns that thwart your progress, strengthen those that move you closer to goal, and develop options for any that trip you up. The calendar is useful because you can anticpate upcoming events and put alternatives into place.
Premenstrual cravings are common, and if you know you like sweets or salty items you can have healthy options on hand. Holidays, vacations and meetings can be planned. Seasonal trends can be addressed (I realize I made excuses when it rained not to go out, so I substitute indoor exercise.)