Inclusion Criteria:  Healthy fishermen Healthy health care workers Who will be willing to participate in the study  Exclusion Criteria:  Those who will refuse to participate in the interview Physically and psychologically handicapped Subjects with known chronic illnesses like liver, kidney or gastrointestinal disease, metabolic bone disease, malignancy, pregnancy and lactation, history of immobility for more than 1 week, on vitamin D or calcium supplementation, on anti-epileptic drugs Primary hyperparathyroidism Subject having lactose intolerance