well, 9-10kg is about 20 lbs, so I dropped from 165 to 145.
Diet? it is not about diet man. Floyd eats whatever
, as long as he works his ass out properly. Metabolism does the job.
remember, if you want to drop weight a lot - it is a serious stress for your body, for your heart. So, at first, work on cardio, it does not matter what is the weight dynamics actually. With improved cardio you can start working out more often and more seriously, this would lead to actual weight loss.
Like I said, cut on fat, unhealthy sugar like coke. That would help a lot. But do not expect fast results.