Lemon water feels like the healthy order. A wedge looks fresh, vitamin-rich, and harmless. The problem is not the fruit. It is how the fruit is handled. In a busy kitchen or bar, lemons are often cut ahead of time, stored in open trays, and dropped into glasses with bare fingers. Heat never touches them. Whatever is on a hand, a knife, or an unwashed rind goes straight into the glass.

A 2007 study in the *Journal of Environmental Health* swabbed 76 lemon wedges from 21 restaurants. About 70 percent grew some kind of microbe on the rind, the flesh, or both—bacteria and yeasts among them. The researchers said those organisms *can* cause illness, but they did not prove that most diners get sick from a wedge. A 2008 *Good Morning America* check of a small set of chain-restaurant lemons found fecal traces on some samples and *E. coli* on at least one. Other lab work has turned up skin and gut bacteria that travel when gloves and tongs are skipped.

That does not mean every restaurant is serving waste on purpose. It means garnish trays sit out, rushes are fast, and raw fruit is a poor place to hide sloppy handwashing. Menus, shakers, and other untouched-looking items pick up the same traffic. Healthy adults often shrug it off. Young children, older diners, and anyone with a weaker immune system have less room to shrug.

You do not have to stop eating out. Ask for water without the wedge. If you want citrus, squeeze a lemon you washed at home. Wash your own hands before the meal. The luxury of a yellow slice is small. The cleaner choice is a plain glass and a kitchen that does not need to prove the garnish was worth it.