Recording notes for your Diet.
Just measure your weight and body fat percentage at morning and night then record it !
Those data will be saved into HealthKit, so you can use those data with other apps via HealthKit.
Those records will be displayed with morning-night pair values.
Then you can see the progress graphically.
Implicitly you will always be aware of incense and decrease.
input data is so important. so you can export input data via email with using CSV format.