I just want to mention that with your height the healthy bmi range is about 30lbs, so if you're within the healthy range you'll be quite underweight afterwards. Please stay healthy!
That said, while I can't come up with a dare right now, I want to suggest a rule which might help you get on track.
Weight yourself once a week at the same time of the same day. If you lost at least 0.5 lbs that week, all is fine. If you lost less, you'll be denied any and all orgasms for 1 week. If you gained weight you're denied as well and will spank each your ass cheeks 50 times per day in a single session. If you gained more than 0.5 lbs double the spanks.
Quick reference:
Lost < 0.5 lbs: denial
Gained > 0 lbs: denial plus 50 spanks per ass cheek per day
GAined > 0.5 lbs: as above but double amount
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