I think it would be too complicated to base it on whoever lost the biggest percentage of their body weight - though I see what you are getting at.Does anyone else think it seems a bit unfair that slimmer of the week goes to those with the biggest loss that week.
Unfortunately not everyones metabolism results in big losses, so some may continously lose a small amount each week and therefore not get recognised for their hard work and motivation, when they have probably been just as focused as someone who experiences big losses all the time.