A health study was done by Dr. Dariush Mozaffarian, of Harvard School of Public Health, which measured the toxin levels in many thousands of toenail clippings. They found out that eating fish and the mercury content did not raise the risk of people developing either heart disease or stroke.
Health experts have long told us that eating fish was good for us to lower heart risks, however they were concerned about the mercury levels in certain fish might counter-act the benefits.
This unusual study, funded by the government, measured the mercury found in toenails, which is a very good gauge of the long term exposure of mercury from fish consumption.
The study found that there were no differences in the rates of stroke or heart risks in those with the highest concentrations of mercury compared to the people with the lowest concentrations.
The conclusion was that people should eat fish as part of their healthy diet and not worry about any ill heart effects.