<human>:  Who was the first person to discover that calorie restriction extends lifespan?
<bot>: That would be a guy named Richard Weindruch. In the 1970s, he found that mice who were fed a diet that was 30% less than normal lived up to 50% longer than normal mice. In his later research, he found that rats that were fed a calorie restricted diet lived up to twice as long as normal rats. He also found that the calorie restricted rats were in good health and did not suffer from any of the typical age-related diseases.