of fish oil plus a placebo. The last group took two placebos. After more than five years, researchers were unable to find any overall benefit.

While the overall results were disappointing, there appeared to be a beneficial effect when it came to one aspect of heart disease and fish oil: heart attacks.

A secondary analysis showed taking fish oil lowered the risk of heart attack by about 28 percent, which is a "statistically significant" finding, says Dr. JoAnn Manson, who is chief of the division of preventive medicine at the Brigham and Women's Hospital in Boston. She led the research.

Those who appeared to benefit the most were people who didn't ordinarily eat much fish in their day-to-day diet, as well as African-Americans, Manson says.

African-Americans in the study experienced a 77been examined properly either.

He added that it was also impossible to predict what the result of the new trial would be.

During the original case, prosecutors could not confirm that he had actually eaten the victim, but some body parts were never found.

(Image: CEN)

When police arrived at the property, he reportedly showed them where the pieces were buried, but officers say the victim's penis was never found.

Guenzel went on trial in August last year accused of cutting the body into small pieces and burying them in his garden, making a macabre home video in the process.

The pair had met in October 2013 on a website for slaughter and cannibalism fantasies which described itself as the "Number 1 site for exotic meat" with more than 3,000 registered members, according to