Via the Life Extension Foundation News, a short article on hormesis and its effects on our health and longevity. As for so many complex aspects of our environment and biochemistry, researchers presently know too little to offer specific recommendations: "Small doses of 'stressors' normally considered dangerous to health can actually boost the body's self-repair system, and as a side-effect preserve youth, experts believe. ... In recent years, it has been shown to extend lifespan in yeast, fruit flies, worms and rodents. If the results of such studies also apply to people, it means hormesis could extend average human lifespan to 90. Average lifespans in the UK are now around 75 for men and 80 for women. Stressors seem to kick-start natural repair mechanisms, including the enzymes that patch up damaged DNA. As the repair systems fix damage normally caused by ageing, the body is rejuvenated. ... Exercise and calorie restriction may both promote longevity partly through the stress they cause."