If you're doing your searches online, add the text "site:.gov" or "site:.edu" (minus quotation marks) to the end of your Google searches.
For example, if you wanted reputable, peer-reviewed studies on the effects of low-carb dieting, you might search for:
low carbohydrate diet site:.gov
low carbohydrate diet site:.edu
That weeds out everything but university sites and government sites. There'll still be a little chaff in the wheat--student papers, government regulations that are outdated--but you won't see utter garbage like the "Blah Blah Hospital Diet" hoax or the "Master Cleanse" crap.
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