Many biochemical process happen at optimal rates only at optimal body temp, faster at higher temps, and slower at lower temps. I think Peat considers 99 deg F to be approx optimal, and current lower norms as reflecting the commonness of slightly hypothyroid states?
Generating extra heat might be a problem in a food shortage (hence adaptively reduced metabolism in famine conditions). If there is plenty of fuel, then doesn't Peat suggest that 'wasting' some of it to maintain higher temps (without getting dangerously high) and higher CO2 flow and higher overall flow of energy is helpful for optimally maintaining both structure and processes?
Generating extra heat might be a problem in a food shortage (hence adaptively reduced metabolism in famine conditions). If there is plenty of fuel, then doesn't Peat suggest that 'wasting' some of it to maintain higher temps (without getting dangerously high) and higher CO2 flow and higher overall flow of energy is helpful for optimally maintaining both structure and processes?