这个动作喝饮料，相当于给水接种细菌，很多人都在做

Core Insights - The article discusses the surprising findings of a study on microbial growth in various beverages after opening, highlighting that even seemingly safe drinks like mineral water and tea can harbor bacteria after being opened [4][6][12]. Group 1: Experiment Findings - The study included a variety of beverages such as carbonated drinks, dairy drinks, fruit juices, sports drinks, and teas, with a focus on how they change after being opened and left at room temperature [4][10]. - In the "half-poured" group, where half of the drink was poured out and the cap replaced, microbial presence was detected in most beverages, including mineral water and tea [6][10]. - The "half-drunk" group showed even higher microbial counts, with the highest rates found in milk tea, mixed tea, and milk coffee, indicating that drinking directly from the bottle increases contamination risk [8][12]. Group 2: Factors Contributing to Microbial Growth - Nutritional content plays a significant role in microbial growth, with nutrient-rich beverages providing an ideal environment for bacteria to thrive [16]. - Beverages with a pH above 4.6, such as many teas and milk teas, are more prone to microbial growth compared to those with lower pH levels [18][20]. - The absence of carbonation in drinks also contributes to higher microbial growth, as carbonated beverages have natural antibacterial properties due to lower oxygen levels and higher acidity [21]. Group 3: Recommendations for Beverage Safety - To prevent microbial contamination, it is recommended to consume beverages in one sitting, or if not possible, to pour them into a cup before drinking [28]. - Homemade drinks and those stored for more than 12 hours should be discarded to avoid health risks [28].