PRAGUE—In most restaurants and taverns across the Czech Republic, a mug of beer is, literally, cheaper than water. The country's health minister wants to change that as he tries to put Czechs on a lower-hops diet.

It won't be easy. Here in the birthplace of pilsner, beer is known as "liquid bread." Czechs drink an average of 37 gallons of the stuff per person per year, the highest per capita consumption in the world and more than double U.S. levels.

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