I guess that's why it's an experiment. Having cut grains from my own diet I haven't seen any positive effects other than weight loss, and this guy doesn't need

I guess that's why it's an experiment. Having cut grains from my own diet I haven't seen any positive effects other than weight loss, and this guy doesn't need to lose weight, but other people may respond in different ways. There's no especially good reason to suppose that grains are bad for you, but there's no especially good reason to suppose that they're not. Grains are a perfectly serviceable food source and helped to provide greater food stability for our neolithic ancestors (at least for those of us who had neolithic ancestors) but it's plausible that a diet excessively rich in them might contribute to minor ailments. Anyway, better to experiment with it for 30 days than to sit around and prognosticate about whether it will work or not. The only downside is that you can't necessarily trust your introspective observations about your condition.