DiaBook is a free iPhone app designed to help individuals manage their lifestyle with diabetes. It combines blood sugar monitoring, nutrition tracking, and exercise logging all in one convenient application.

With DiaBook, users can track their calorie intake and expenditure through the Calorie Counter feature. This tool calculates the remaining calorie allowance for the day based on consumed and burned calories, giving a clear overview of progress towards daily goals.

Additionally, the app offers a 7-day retrospective view of calorie goal achievements, providing insights into long-term trends. Users can input a variety of data, allowing healthcare providers to derive valuable insights for personalized treatment plans.