You don't need a bunch of cycling back and forth. A few times is plenty. I have every-varying food sensitivities (mostly exposure causes sensitivity which wil

You don't need a bunch of cycling back and forth. A few times is plenty. I have every-varying food sensitivities (mostly exposure causes sensitivity which will eventually fade if I leave the offender alone for long enough) and I've been around the loop of figuring out what is it now many, many times. (At least to the degree I can figure it out--more than once it's clearly been an impurity in an item. And you often don't know--I know "artificial flavors" is very likely to be a problem--but what exactly? I'm no chemophobe--second on my list of likely to be a problem is "natural flavors".) Rarely does it take me more than one repeat to be confident of what is bothering me.