Industry data is flashing warning signs for energy drink stocks.Shares of energy drink company Celsius (CELH -2.16%) fell as much as 16.8% this week, according to data provided by S&P Global Market Intelligence, as industry data pointed to slowed growth for energy drinks. Shares are down 16.7% for the week at 2:30 p.m. ET.The energy drink slowdownTo be clear, there aren't any earnings reports out yet, but investors are looking at market data from third-party analysts that indicate slowing growth for energy ...