Hah, little late on this one. Sorry:
Gummis were just one data point. But wasn't it one data point in a series of others? The other foods/consumables that, when discontinued, marked an improvement, or vice versa. Stopping them wasn't just a dramatic shift; it was a dramatic shift which mimicked the other dramatic, food-related behavior shifts.
I guess the point is that IMO one's children should not be by default a clinical trial; every meal is a trial enough, from the sounds of it. Prior to the full-on hard-proof scientific method is a period of observation and field work, after which a hypothesis can be formed and specific studies can be done.
On the other hand, part of the understanding Clod is working on seems to be that the triggers are very distinct from person to person, even two siblings from the same parents. By nature sample sizes will, at this stage, be small, and the changes overlapping.
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