Have any large-scale studies investigated the personality types likely to follow "conspiracy theory" fads ....?

....related to diet and health (e.g. deploring "artificial chemicals" vs. "natural" cures, favoring "colon cleansing" and "raw foods" versus "evil agribusiness", etc.)

I'm not interested in reading emotional rants rehashings of the classic debates surrounding these topics. (Those are easy to find through any search engine or by visiting quackery websites.) I'm asking about published psychological studies appearing in peer-reviewed journals attempting to profile the types of people likely to be drawn to various health fads despite the scientific evidence weighing against their efficacy and safety.

Sources/citations please?