A nice feature would be to get some badges for certain achievements based on both activity level and diabetic control.
Some Examples
DIABETES
100% Time In Range - on a single activity
Most Improved - 4 weeks of consistent improvements
Weekly Warrior - 100% TIR in all activities for the week
Hypo Hero - Session without a hypo
GENERAL
Consistently Cool - Somebody who did 7 days of daily activities streak
Monthly Mammoth - Somebody who logs 28 days of daily activities streak
Annual Animal - Somebody who logs 365 days of daily activities streak
RUN
Leg Stretcher (first run activity banked)
5km
10km
1/2 Marathon (13.1mile)
Marathon (26.2 miles)
RIDE
Free Wheeler (first ride activity banked)
25km
50km
50mile
Mentric Century - 100km
Century - 100mile
Iron Man Ride - 112mile / 180km
Double Metric - 200km
Double Century - 200mile
SWIM
Pool Hero (first pool swim)
Open Water Warrior (first outdoor swin)
¼ mile (Sprint Triathlon Distance)
½ mile
1km
1 mile (Olympic Triathlon Distance)
1.2 miles (Half Ironman Distance)
2km
2.4 miles (Ironman Distance)
5km Swim