Icelanders are extremely inbred. That, and their detailed genealogical records, make them an extremely valuable resource for genetic study. However, their life expectancy is quite high, probably more in correlation with their lifestyles than the detrimental effects of inbreeding.
Humans as a whole are fairly inbred. "Mitochondrial Eve" only lived about 150,000 years ago, making us perhaps one of the most genetically homogenous species on the planet. And when you're genetically homogenous already, you don't notice the effects of inbreeding that much.
Humans as a whole are fairly inbred. "Mitochondrial Eve" only lived about 150,000 years ago, making us perhaps one of the most genetically homogenous species on the planet. And when you're genetically homogenous already, you don't notice the effects of inbreeding that much.