>> Previous studies have led researchers to believe that individuals with social anxiety disorder or social phobia have too low levels of the neurotransmitter serotonin. A new study, however, shows that the situation is exactly the opposite. It's stuff like this that is destroying the reputation of science in general. I know it's one thing to "lead to believe" and another to "show that", and perhaps that's what happe…
The problem is not these supposed 'reversals', but rather how this information is being reported. Pop-science media reports modest studies as absolute truths to catch eyeballs. When one study merely suggests research in one direction, it's emblazoned as fact on the tabloids.
In the example you identified: "Fatty food is bad - no it's good" the issue is not the studies flip-flopping. Rather, it's a problem of regular people taking what are likely modest reports way too far and massively integrating them into their daily lives, without ever reading the study and understanding the context or scope of it. A study indicating that, say, there may be health problems associated with consuming excess saturated fat seems to compel people to follow no-fat diets. So I'd argue that the bigger problem is people reading oversimplified reports of scientific information
I mean, I'm not terribly familiar with this field, but the study itself indicates that whether high or low serotonin levels were contributory was "a matter of debate" and that "only a few studies have used molecular neuroimaging to examine serotonin dysfunction in SAD directly."[1] So this doesn't appear to be a reversal at all, but rather a study which helps clarify the role of serotonin in SAD.
[1] http://archpsyc.jamanetwork.com/article.aspx?articleid=23197...