Scientists Tested Restaurant Lemon Slices—What They Found Might Make You Skip the Garnish
Ordering water with a slice of lemon seems like a fresh, healthy choice, but research suggests that restaurant lemon wedges may carry more than just citrus flavor. Several studies have found that improperly handled lemon garnishes can harbor bacteria, making them less appealing than many diners realize.
One well-known investigation found that many restaurant lemon slices carried bacteria linked to poor food handling practices. Another study published in the Journal of Environmental Health examined lemons from multiple restaurants and detected microbial contamination on a significant number of samples. The problem isn’t the lemon itself—it’s how it’s is washed, sliced, stored, and handled before reaching your glass.
Lemons are often cut hours before they’re served and may sit at room temperature during busy meal periods. If employees handle them with bare hands or use knives and cutting boards that haven’t been properly sanitized, bacteria can be transferred to the fruit. Although lemons are acidic, the juice from a single wedge diluted in a glass of water isn’t enough to eliminate harmful microbes that may be present.
If you enjoy lemon water, the safest option is to prepare it at home. Wash the entire lemon thoroughly under running water before cutting it, use clean utensils and cutting boards, and refrigerate any leftover slices in a sealed container. This simple routine helps reduce the risk of contamination while still giving you the refreshing flavor you enjoy.
When dining out, plain water or sparkling water without a garnish is often the safest choice. If you prefer citrus flavor, you can ask whether the restaurant has freshly cut lemons or simply skip the wedge altogether.
Lemon water can still be a healthy, refreshing drink—but knowing how that garnish was handled makes all the difference. Sometimes the simplest way to stay safe is to leave the slice on the plate instead of in your glass.
