Others get what is called a (a fake treatment or sugar tablet which contains no medicine at all). In this kind of research study, the patients are "blinded" they do not know who is getting the treatment and who is getting the placebo up until the trial is over. That method, their action to the drug or placebo can't be affected by whether they think they have actually been taking the real drug or not.
It's unusual for one research study to be the final word. Medical understanding originates from numerous research studies done over time and frequently there are contradictions along the way. Often, various studies of a specific treatment or condition, all done correctly, can still have various (or even totally opposite) results. Likewise, the news media (and even researchers themselves!) are more most likely to report the findings of a study if that research study shows results that are different from what is believed to be true.
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However other research studies might show that eating that food does not really make much difference. The scientific neighborhood can take into account all the various studies and decide that eating the food might not truly assist a person avoid cancer. But to the regular individual who simply becomes aware of one research study through the news, that food suddenly ends up being a cancer-fighting wonder.
The very best medical and clinical journals like The New England Journal of Medicine, The Journal of the American Medical Association, Pediatrics, Science, and Nature thoroughly evaluation studies prior to publishing them so the info is credible. These publications are composed for the scientific community, and the language in them can be hard for people who aren't medical professionals or researchers to comprehend.
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Some press reporters don't always wait till something is released prior to reporting it as news. Often press reporters hear info from scientists prior to a research study has actually even been released and they desire to bring it to the public's attention rapidly. Without a released study, though, a press reporter may not have all the truths.
Put keywords from the news report into a search engine and see what shows up. The results will give you great deals of different viewpoints especially if the concern is big news so you're not depending on just one report for the realities. You'll need to evaluate what you see, though.