articleThe Brief A viral drink trend called heavy soda adds extra syrup to fountain sodas for stronger flavor. A new drink trend is bubbling up across social media, and health experts aren’t impressed. Known as "heavy soda," the fountain option boosts syrup levels for an ultra-sweet taste designed to outlast melting ice. Unlike the more elaborate "dirty soda" trend, which mixes soda with creamers, fruit purées or syrups, heavy soda keeps things simple — it’s all about maximum sweetness and stronger flavor. "The extra syrup gives it extra flavor, and it feels like even more of a little treat," Manuele said.