mexico now has the lowest life expectancy of all oecd countries while life expectancy increased by three years on average across oecd countries between and rising from years to years it increased by only years in mexico from to years this means the gap in longevity between mexico and other oecd countries has widened from about four years to almost six years between and rates of overweight or obesity increased from to of the adult population one in three children is also overweight or obese