A survey of global trends in body mass index has found that, in 2008, the highest BMIs were found in some Oceania countries including Nauru. Among rich countries, New Zealand women had the second highest BMI levels, after the United States.
Read the Lancet research: The Lancet, 4 Feb 2011 (PDF)
Read the Lancet abstract: The Lancet, 4 Feb 2011
Read the Lancet press release: Eureka Alert, 4 Feb 2011