Higher thyroid hormone levels are associated with increased metabolic rate and longevity.

“across species it is very clear that a higher basal metabolic rate higher metabolism is associated with longevity within a species especially whether it's dogs or mice or humans higher metabolic rates are associated with more longevity and I will repeat that within species including humans and dogs and mice the hotter you burn and I'll repeat that within species including humans dogs and mice the hotter the Flames are the more your engine is stoked the higher your basil metabolic rate the more longevity that is associated with”