Anorexia is good for climbing!!

Don't worry, the above is ABSOLUTELY NOT my opinion. I have only chosen an extreme title for this topic because then hopefully more people will click on it and react ;) Here's the real topic. For a climber, I'm fairly heavy for my height. Sadly, this is in the greatest part because of an abundance of muscle especially in my lower body, not because I'm too fat ;) I'm 1.75m and 75kgs. So the dilemma is this: Would the benifits of weighing less outweigh the perhaps negative effects of losing some muscle in the upper body?? If you calculate what the ideal BMI for a climber is, according to the BMIs of the top 50 8a scorecard presentations, it is about 20.2. Conversely, translated to my height I would then have to weigh about 63 kgs to have reached the 'ideal climbing weight'. Which in my case is a weight loss of 12kgs. Needless to say, that's a lot, and committing to it would not be an endeavour without serious consequences. I am fully aware of this. I think I can lose about 7 kgs of fat untill I'm at 6% fat (the minimum for me) That means, hypothetically, I'd have another 5kgs of MUSCLE TISSUE to lose before I reach my 'ideal climbing weight'. Weight loss would occur in my legs, but also in my upper body. So what do you think? Should I go for it? And if so, how??