Over the next few days, there will be many people watching the NCAA tournament with a beer by their side. And when they do, there’s a good chance that beer will be light. According to Beer Marketers Insights, Bud Light was the top-selling beer in 2012, making up more than 18 percent of the entire beer market. Light beer was invented in the 1960s by a biochemist who believed many people didn’t like beer because they were afraid it would make them gain weight. Ultimately, that beer became the precursor to Miller Lite.