Losing leg muscle mass???

from the "optimum weight" 3d you can see a general curiosity about this topic. I'm in too since my natural morphotype is "big legs" (I mean in general, not just compared to other climbers). I'd like to loose some quads as long as I can still be able to do a one-legged squat and make my way up the trail to céuze :) the few web resources on the topic suggest to reduce calories intake, and then two opposite roads. a)No protein intake and 1hour or plus of jogging or light running as frequently as possible (apparently makes muscles eat themselves...). The models are marathon runners (they do have very skinny legs despite they are running) b)keep training upper body and avoid any hard leg workout. So, I guess, be intentionally slow on steep approach walks, avoid jumping around, etc.. but, we'd all like to hear more details and thoughts from dr.8a. (for instance, if option a could work even when applied for shorter periods, it would be easy to implement it in a 2 weeks annual break from climbing...)