I think you're confusing what is indeed factual, such as the benefit of certain nutritional supplements, with the ideology that claims certain foods, shoes, or other consumer products are "conservative" in a special way.
Not exactly; it is just that, "stereotypically", conservatives are against 'dainty' things like organic food, or non-traditionally-Western approaches (chiropractic, acupuncture, yoga, etc.); such historically being the province of hippies.
(See this Victor Davis Hanson thread on Europe for a loose example of the stereotype.) Cheers!