Recent large studies do not tend to attribute cod-liver oil and supplementation with vitamin D miraculous healing properties. More precisely, in assigned doses, these substances have not shown much benefit.
Those who promote these supplements on the market that say they help with all, but in these tests, vitamin D proved to not matter – says Dr. James Stein (James Stein), a cardiologist from the University of Wisconsin in Madison, who was not involved in the research.
New data were presented at the conference of the American heart Association (American Heart Association) in Chicago and published in the New England Journal of Medicine.
Active ingredients of fish oil are the omega-3 fatty acids: eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA). In new scientific work was tested omega-3s in the form of various dietary supplements, scientists observed over 26000 participants, who at baseline had no heart problems and cancer.
In the group treated with dietary SUPPLEMENTS, during the study were 145 heart attacks, among not receiving omega-3 acid 200 heart attacks. Study author Dr. JoAnn Manson (JoAnn Manson) Brigham and Womens hospital believes this is a significant benefit, but many experts do not agree with it because of the design of the study.
These findings are speculative and require confirmation in a separate study, say Dr. Steve Nissen (Steven Nissen) the Cleveland clinic (Cleveland Clinics).
Thus, the new data do not conflict with the old data of smaller studies in which it was claimed that the commercial product with 4 g of EPA and DHA may reduce the frequency of heart attacks, strokes, cardiovascular mortality and angina.
The group led by Manson was also tested vitamin D. Previously, some studies have shown that deficiency often develops cancer, but it is unknown whether dietary supplements affect the risk.
Vitamin D is not poured on the frequency of heart attack, stroke and cancer. However, after exclusion of first two years from the calculations, the group of people receiving vitamin cancer cases was lower (112 vs. 149).
The development of cancer takes years. It looks promising, says Manson.
However, some experts do not agree.
Both studies were negative. First, they showed that fish oil and vitamin D do not reduce the incidence of cancer and heart disease, said Dr. Lawrence fine, chief of the clinical applications and prevention, National Institute of heart, lung, and blood in the United States.