I've heard various explanations of why we brew with barley rather than wheat, but the one that always made the most sense to me is that wheat is more valuable as a food crop, so it was used primarily for bread and barley was available to use for beer. In other words, there's no scientific reason why you can't use wheat instead of barley as your primary grain, we just do that because that's how brewing evolved. And wheat has plenty of diastatic power, so you should be just fine with a fair amount of corn or rice in your grain bill. A lager with 70% wheat and 30% corn sounds refreshing.
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