Higher iron levels may boost heart health

Scientists have helped unravel the protective and potentially harmful effect of iron in the body. In a series of early-stage studies examining genetic data from over 500,000 people, a team of international scientists, led by Imperial College London, explored the role that iron plays in over 900 diseases. The results reveal not only are naturally higher iron levels associated with a lower risk of high cholesterol levels, they also reduce the risk of arteries becoming furred with a build-up of fatty substances.

Risk of blood clots

However the research, fund by the Wellcome Trust, also reveal the potential risks associate with naturally higher iron levels. These included a higher risk of blood clots relate to slow blood flow blood a common cause of stroke and a higher risk of bacterial skin infection. Dr. Dipender Gill, lead author of the study from Imperial’s School of Public Health, said: “Iron is a crucial mineral in the body, and is essential for carrying oxygen around the body.

However, getting the right amount of iron in the body is a fine balance too little can lead to anaemia; but too much can lead to a range of problems including liver damage.” Dr. Gill cautioned the study only look at naturally occurring iron levels in the body relate to genetic variation; hence between individuals and did not investigate the effect of taking iron supplements. He cautions anyone to speak to their doctor before starting or stopping iron supplements.

In the studies, the research team use a genetic technique called Mendelian Randomization; hence to investigate the link between iron levels and the risk of disease. In this process, they sift through genetic data; hence from thousands of people to identify genetic ‘variants’ with naturally higher iron levels. They then investigate whether people who carry these variants; called single-nucleotide polymorphisms, also had higher or lower risk of a range of conditions and diseases, such as high cholesterol and atherosclerosis.

High iron levels

The results, publish in the Journal of the American Heart Association and PLOS Medicine; so reveal that naturally higher iron levels were with reduce risk of both high cholesterol and atherosclerosis. Atherosclerosis is a potentially serious condition where the arteries become clogged with fatty substances. This can reduce the flow of blood in the arteries; also in some cases can lead to a block in flow to the brain (triggering a stroke), or the heart (triggering heart attack).

However, the picture was complicate by further findings from the same study; which reveal high iron levels may be link to a risk of clots relate to slow blood flow, which can increase the risk of certain types of stroke and the condition deep vein thrombosis. And to add to this, the studies also reveal higher iron levels may also be link to an increase risk of bacterial skin infections. Dr. Gill said these findings now need to be investigate in patient trials. They explained: “These studies reveal new avenues of research, and present many questions.

They are still unclear on how iron affects cholesterol levels; so narrows arteries and form blood clots, but we have ideas. One possibility is that the lower cholesterol levels may be link; hence to the reduce risk of arteries becoming furred. Furthermore, higher iron levels may cause blood clots to arise when flow is reduced, possibly explaining the increase chance of clots.” They adds that previous research suggests that iron may also play a role in bacterial replication and virulence; which may be link to the increase risk of skin infections.