The intake of vitamin D is lower in obese than normal weight subjects, as we reported in an epidemiological study on more than 18 000 subjects (8). There are also indications for an association between vitamin D and obesity, and that serum levels of 25-hydroxyvitamin D (25(OH)D) are reduced in obese subjects ( 4, 6, 7). Recently, a low serum level of vitamin D has also been associated with a number of other diseases, such as inflammatory bowel disease, rheumatoid arthritis, hypertension, cardiovascular disease, diabetes mellitus, and cancer (5). The importance of vitamin D for skeletal health is undisputed, and lack of vitamin D in childhood causes rickets. The cause of obesity appears to be both genetic and environmental (2), and obesity increases the risk of several endocrine dysfunctions (3), including changes in the calcitropic hormones (4).
There is an increase in body weight world wide (1).
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