1. A method comprising: scanning, by a first mobile device including a sensor, a machine readable code attached to a physical object, the machine readable code including data identifying a food item; retrieving, by the first mobile device, using the data identifying the food item, nutrition data corresponding to the food item; associating the nutrition data with a new entry created in a dietary log to yield an updated dietary log; sharing the updated dietary log with a second mobile device; and categorizing the updated dietary log based on the food item.