A review published in 2009 in Transactions of the American Clinical and Climatological Association reports that an increase in body temperature is associated with a higher metabolic rate, and higher body temperatures do speed up metabolism. read more
The relationship between the rate of metabolism and temperature can be visualized as a hump-shaped curve. Enzyme activity, and therefore metabolism, is slow at the lower and upper ends of a given temperature range, and highest at some optimum point. read more