In Season 4, episode 8 of Torchwood: Miracle Day, a character is said to have prolonged their life (not much, but definitely longer) by keeping their core temperature two degrees lower than normal, maintaining a lower caloric intake, and keeping their blood pressure below 110 (I assume systolic pressure).
Is there actually any scientific evidence to validate this? I know it's a science fiction show, but they seemed to at least imply that this part was accurate in life.