Fig. 2.

Screenshots of the app from the second usability test. Participants could self-track ( A ) a meal item's serving size, number of fruit and vegetable servings, associated carbohydrates, and current blood glucose; ( B ) the number and type of alcoholic beverage, associated carbohydrates, and current blood glucose; and ( C ) the duration, intensity, start time, and current blood glucose of exercise. Following this study, the entry of meals and alcohol was streamlined from two interfaces down to just one interface and users could access the United States Department of Agriculture nutrition database. Additionally, users could track the compensation techniques employed at the time of meals and exercise.