Each family member participating in the family food journal needs to record everything he or she eats and drinks, including snacks and glasses of water. Tracking your food intake means if it goes into your mouth, you track it. Encourage family members to be as specific as possible. For example, if you have a salad at lunch, make sure to list all the ingredients of the salad, from mixed greens to the sunflower seeds you sprinkled on top, not just the salad itself. And don't forget the dressing
How long you keep your food journal is up to you, as is how often you consolidate everyone's information into one place. You'll start to see a pattern in about a week, but even after a day or two, you might see some red flags.