“…However, Hunt et al (12) who studied British Asians who kept a diary of the time spent outdoors found a significant correlation between 25(OH)D3 and outdoor time. Moreover, the high summer 25(OH)D3 among US lifeguards (9) whose exposure is particu larly high, and the decreased levels of submariners (22) after 2 months patrol service, despite a good diet, as well as the reported seasonal variations (9,10,13,17,23,26), emphasize the importance of sunlight. Our failure of finding an association between reported exposure to sunlight and serum 25(OH)D3 is possibly due to the fact that sunshine in Jerusalem is sufficient for preventing low serum levels of 25(OH)D3.…”