Light and dark beer differs only in the color of the grains that are used, and dark beer will often be as light or lighter in taste than many light beers. Understand the main differences between light and dark beers, ales and lagers with information from a professional bartender in this free video on beer.
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What is the difference between light and dark beer? Well, the only difference between light and dark beer is the color of the grains used. So a lot of people think that darker beers are heavier; they might have more sugar. In some cases that's true; in some cases there's a lot more malt added to a beer and it gives you a darker color and it's a heavier beer. But, you know, ninety percent of the time, it's just the color of the grains. A beer like Guinness, they use very dark grains and it gives you this dark color. But Guinness is a much lighter beer than most other beers; even lighter than these two you're looking out right here which are very popular beers. So ales can be dark; there are dark ales just as there are dark lagers and the only difference between ales and lagers is the temperature at which they're fermented. So dark grains can still be used for either one. So that's basically the difference.