Selenium supplements increase cholesterol levels: Study

However, a new study suggests that when the balance is altered and the body absorbs too much selenium, it can be hazardous for the health.

According to researchers at the University of Warwick, a high intake of the mineral supplement might cause cholesterol levels to rapidly increase, thereby exposing eaters to an increased risk of cardiovascular diseases.

Lead author of the study Dr Saverio Stranges stated, “This use has spread despite a lack of definitive evidence on selenium supplements efficacy for cancer and other chronic disease prevention.

“The cholesterol increases we have identified may have important implications for public health. In fact, such a difference could translate into a large number of premature deaths from coronary heart disease.”

Details of the study
The researchers studied high cholesterol levels from selenium among 1042 participants aged 19-64 in the 2000-2001 UK National Diet and Nutrition Survey.

They were questioned about their lifestyle, diet and alcohol intake. In addition, their blood samples were taken.

The scientists discovered that high concentrations of selenium levels were 'associated' with a ten percent rise in cholesterol. They also found that participants who had an excess of the mineral in the body had a cholesterol score that was eight percent higher than the average.

Nearly half of the subjects examined with elevated selenium in their blood confessed to taking dietary supplements.

The authors stated, “We believe that the widespread use of selenium supplements, or of any other strategy that artificially increases selenium status above the level required, is unwarranted at the present time.

"Further research is needed to examine the full range of health effects of increased selenium, whether beneficial or detrimental.”

A bit about selenium
Selenium, reputed for ant-oxidant properties, is found in meat, Brazilian nuts, seafood, and vegetables. It is vital for the body's immune system, thyroid function, and reproduction.

However, earlier studies have linked selenium supplements to increased risk of diabetes. In addition, excess of selenium is known to cause selenosis which results in loss of skin, hair and nails.

All the above problems, along with the latest research that links increase in selenium intake to the risk of cardiovascular problems, indicate that taking supplements could cause more harm than benefits.

The work was published in the Journal of Nutrition.