How much coffee is too much?

The FDA notes that you can consume about four or five glasses, or 400 milligrams of caffeine, each day, with no side effects.

However, new research suggests that the more caffeine you consume, the more likely you are to suffer from vitamin D deficiency.

A recent study published online in the International Journal of Vitamin and Nutrition Research tested the link between vitamin D and caffeine by analyzing information from the 2005 National Health and Nutrition Examination Survey.

Medical researchers from China and Brazil researched data from over 13,000 participants between the ages of 30 and 47.

After adjusting for other variables, such as age, gender, race, physical activity and diet, the research team confirmed that vitamin D levels decreased in participants with increasing caffeine levels.

The effects of caffeine on vitamin D levels in adults over 47 are unknown.

Further research will also help prove that caffeine actually causes lower levels of vitamin D.