If you have four or five different things causing your symptoms it's very hard to realize the benefits of abstaining from just one. Also you have to consider how powerful an effect denial can have on us. It's very easy to fool ourselves. Other thing you have to realize is effects can be cumulative and sometimes build up subtly and relatively unnoticed. Mold water damaged buildings, gluten and other food sensitivities, water (I'm now a big promoter of distilled water) chemical exposures household cleaners (inhaled absorbed through skin) out-gassing from furnishings, for highly urbanized areas air pollution. Just a few things that need to be considered.