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Introduction Overweight and obesity are one of the most serious public health challenges for the World Health Organization?s (WHO) European region today. The WHO clearly state that health assessment is needed in order to illustrate the dimensions of the obesity epidemic. Therefore, the aim of this work was to investigate the prevalence of overweight and obesity in a representative sample of adult and elderly Norwegians. Methods A total of 901 (441 female and 460 male) adult and elderly Norwegians (20 ? 85yr, mean; 51,3 yr, SD; ±14,8yr) were randomly enrolled as part of the Norwegian KAN project phase II; health related physical fitness assessment. Body weight, height, waist circumference (WC) and skinfold measurements from 3 sites were measured, and body mass index (BMI) values were calculated. Results Mean BMI was 25,8 kg/m2 (SD; ±3,9 kg/m2), where females displayed significantly lower BMI (25,3 kg/m2) values than males (26,3 kg/m2). A total of 40,1% (29,9% females and 49,8% males) were classified as overweight and 12,7% as obese (13,4% females, 12,0% males). A significant increase was found in mean BMI values with increasing 10 year age range groups (p=0,037 females, p=0,001 males). Mean WC was 90,1 cm (SD; ±12,1 cm,), where males had a significantly higher mean value (94,7 cm) compared to females (85,2 cm) (p=0,001). In both males and females a significant increase in WC was detected with increased age (p=0.001 and p= 0.003, respectively). A total of 66,1% of the females and 51,4% of the males were categorized as having an increased risk of weight related metabolic complications (WRMC) according to the WHO cut-off values for WC values, where 37,5% of the females and 24,3% of the males were at highly increased risk of WRMC. Females displayed a mean sum of skinfolds of 81,8 mm (SD; ±24,4 mm), and the males a mean of 70,5 mm (SD; ±25,5 mm). No significant change in skinfold measures was detected across age groups. Discussion As many as 61,8% and 43,3% of Norwegian males and females, respectively, are either overweight or obese. Both the average male and female WC are above the WHO cut-off values for increased risk of weight related metabolic complications (WRMC); ?94 cm for men and ?80 cm for women. As expected, the BMI and WC increase with increased age in both genders. Gender differences are also found, as males display higher values for both BMI and WC. Governmental measures should be initiated in order to address the situation.