As reported in The New York Times, the U.S. Preventive Services Task Force has already come out in the last several years critical of the value of cancer screenings. Several years ago they found that early mammogram screenings were probably not necessary in women under 50 and that women over 50 should consider having them less often. Just this year the USPSTF has published an opinion on the PSA form of prostate cancer screening in men, saying that the harms of such screens may actually outweigh the benefits.
While you can take omega-3 supplements, studies have shown that the body is better able to absorb the omega-3 if eat certain foods that contain it. You also need to be aware the there are different forms of omega-3. The EPA and DHA are the forms that can be directly used by the body. Salmon, sardines, and herring contain very high amounts of EPA and DHA and are your very best food sources for omega-3. Other fish, grass fed beef, eggs produced by pasture fed chickens, shrimp, oysters, scallops, and wild game such as deer and elk are also good sources for omega-3.