Good nutrition is essential to good health. A daily food journal encourages people to monitor every single thing they ingest. 1. A food journal monitors the emotional reactions when eating a certain type of food. 2. It can help people discover if they have any unknown food allergies that are making them sick. 3. They can encourage healthy portion choices. 4. The journals can document how someone felt physically after eating a food. 5. People can be encouraged to eat more good food if they realize they are eating mostly bad foods.