Conventional wisdom about running is passed down like folklore (and sometimes contradicts itself): The right kind of shoe prevents injury - or running barefoot, like our prehistoric ancestors, is best; eat a high-fat diet - and also carbo load before a race; running cures depression - but it might be addictive; running can save your life - although it can also destroy your knee cartilage. Often it's hard to know what to believe. In Running Smart, Mariska van Sprundel, a science journalist and recreational runner who has had her fair share of injuries, sets out to explore the science behind such claims. She explains how the body burns fuel, the best foods to eat before and after running, and what might cause "runner's high".