There are studies which reveal that people who use food journals for various references are more successful in losing weight and keeping it off. (fitness-baron.com)
You can read about my Whole30 experience here, which also includes a full food journal of what I ate every day. (ourpaleolife.com)
Studies show that people who stay dedicated and keep track of a detailed food journal lose more weight and actually maintain the pounds lost. (dietsinreview.com)