Day 18 -- cruising past the mid point. Still dread the showers, but feel great afterwards. Instantly warm.
Another thing of interest, I've noticed most of my heat comes from the back between my shoulder blades. Even when I'm sitting in a chilly car without a coat or get on the chilly side somewhere, I can feel that heat kicking in. At times it is so pronounced it feels like an electric car seat heater on this area of my skin. I did a little bit of reading at JD's prompting and learned this is where Brown Fat lives, so maybe it was there all along or perhaps I'm getting some activation in the shower that's turning it on now as needed. IDK.
Either way, this has been a fun experience in doing something small but extremely different. As an aside, we had a couple over for dinner Tuesday night, and I found another cold shower fan -- he even does ice water baths in the summer because cold pipes get too warm for a good effect. According to him, the Brown Fat science shows you must hit the shivering point to get activation and white fat conversion -- he's skinny as a rail, so it must be working for him.
Maybe I should get one of these.
http://coolfatburner.com/