What is the best way to slow my metabolic rate? I can go out in temperatures that are below freezing in a T-shirt, no sweater and no coat on.
In the summer when the temperature gets above about 25*C (77*F), I may over-heat and become ill.
I need to know how to reduce my metabolism to get my normal core body temperature down.

In the summer of 2003, it was 39*C (101*F) where I was in London, United Kingdom and that was thier records hottest and I was there.  I was was close to dying of heat-stroke and had lost so much salt through sweating that I had hyponatreamia (dizziness and cramps from low sodium content).

I am now living in north Canada and because of global warming, our summers are getting unbearably hot.  It can be 24*C (75*F) outside.  I know someone was in an office that got to 28*C 82*F inside faited last August.

My metabolic rate is very fast, I get a very fast heart rate, I eat tons and tons of food and am still hungry and I am hyper-active and sleep 3-4 hours a night.

Summarized question: What is the best way to slow metabolic rate?