inadequate enrollement

Both vitamin D deficiency and type II DM/prediabetes are highly prevalent. Vitamin D status has been negatively associated with the presence of type II DM and glycemic control. A cause-effect relationship between vitamin D deficiency and the development of type II DM has not been established.

The investigators plan to conduct a 2 year, double blind, randomized, placebo controlled trial on the effect of vitamin D3 supplement on the incidence of type II DM in high risk individuals.

Inclusion Criteria:

• Adults living in Riyadh area with impaired fasting glucose or/and impaired glucose tolerance (prediabetics) and total 25 OH vitamin D level between 10-30 nmol/l
• Who consume no more than one serving of milk/day
• Do not take vitamin supplement
• Habitually have less than 10 hour of sun exposure per week
• Don't suffer from granulomatus conditions, liver disease, kidney disease, or diabetes
• Don't take anticonvulsants, barbiturates, steroids, or antidiabetic medications.