Heart symbols are frequently used to symbolize "health" or "lives" in video games. "Super Mario Bros. 2" (1987, 1988) had a "life bar" composed of hexagons, but in 1990s remakes of these games, the hexagons were replaced by heart shapes (the Castlevania franchise being a notable exception, where the hearts are ammunition for the secondary weapons instead of representing health). Since the 1990s, the heart symbol has also been used as an ideogram indicating health outside of the video gaming context, e.g. its use by restaurants to indicate heart-healthy nutrient content claim (e.g. "low in cholesterol"). A copyrighted "heart-check" symbol to indicate heart-healthy food was introduced by the American Heart Association in 1995.