מעניין ומפתיע

http://www.ynet.co.il/articles/0,7340,L-3231992,00.html

American cancer society -------------------------------- Some studies have found that fish fats rich in omega-3 fatty acids suppress formation AND growth of some types of cancer in animals. Studies in humans have produced conflicting results. However, a recent re-analysis of 40 years of research suggests that omega-3 fatty acid supplements do not reduce cancer risk. Despite early reports to the contrary, researchers have also found that fish oil supplements do not improve cancer-related weight loss. Although some research supports the anticancer claims made for omega-3 fatty acids, some does not. Some studies even show an increase in disease when omega-3 supplements are used. The strongest evidence for the health benefits of fatty acids from fish is in the area of heart disease AND its risk factors. The relationship between omega-3 fatty acids, cancer, AND other diseases is not as well known. The evidence from clinical studies published in peer-reviewed medical journals is mixed. A limited study conducted at Harvard Medical Center suggested that one of the omega-3 fatty acids limited the recurrence of colon cancer. A preliminary study of omega-3s published in the Journal of the National Cancer Institute said that even though there appears to be a biological reason for omega-3s to fight cancer, clinical findings didn?’t prove that fish oil containing omega-3 fatty acids prevented cancer OR its recurrence. In 2006, researchers reviewed 38 studies on the effects of omega-3 fatty acids that have been conducted over the past 40 years. They looked at studies that showed good effect, no effect, AND negative effect of omega-3 fatty acids on development of cancer. In the final analysis, it appeared that there was no effect overall. The researchers concluded that omega-3 supplements are unlikely to prevent cancer. A clinical study published recently in the journal Cancer concluded that omega-3 fatty acids seemed to prolong the survival of people with cancer who were also severely malnourished. A small study recently looked at patients with advanced pancreatic cancer AND severe weight loss. It compared EPA (one of the fish oil omega-3s) mixed with a high-protein, high-calorie supplement to the protein-calorie supplement without EPA. After 8 weeks, the study found that EPA did not help the group gain weight A large study of over 34,000 women followed them from 1980 to 1998, observing intake of fish AND the ratio of fish fatty acids to omega 6 fatty acids to find out how this affected their colorectal cancer risk. Women who took in more omega 3 fatty acids did not have a lower colorectal cancer risk, but they had fewer large adenomas (a type of colorectal tumor). This study suggests that omega-3 fatty acids may not reduce colorectal cancer risk, but may slow its growth. More research is needed to find out if this holds true ************************************************* MD Anderson Integrative Medicine ------------------------------------------- Cancer prevention Several population (epidemiologic) studies report that dietary omega-3 fatty acids OR fish oil may reduce the risk of developing breast, colon OR prostate cancer. Randomized controlled trials are necessary before a clear conclusion can be drawn. Colon cancer Omega-3 fatty acids are commonly taken by cancer patients. Although preliminary studies report that growth of colon cancer cells may be reduced by taking fish oil, effects on survival OR remission have not been measured adequately.

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