Hotels and restaurants which cater to overseas travelers are quite careful to meet high standards of hygiene and to provide foods which suit the northern palate. This does not mean that you will be perfectly safe from stomach problems however. Often just the change in water can trigger upsets, but often it is in the food itself. Cooked foods that contain mayonnaise or dairy ingredients that have been left standing at room temperature are also at risk. Never eat foods bought from vendors on the street, eat only fruits that you peel yourself.
Bottled water is available everywhere and some hotels provide it as part of the service.
Use this even to brush your teeth as tap water even in large international hotels is not trustworthy. Water comes in two forms - con gas or carbonated, and sin gas which is plain purified water. The city of Lima is the center of Peru's fish and seafood industry - among the most prolific and varied in the world. Scallops, conchitas, and mussels, choros, are prepared in an infinite variety of tasty dishes including a lo macho which has a shellfish sauce. Corvina, or sea bass, a choice of shrimp or camarones from the rivers and Langostinos from the sea are more excellent choices from the sea, but trout from the Andean streams are some of the freshest and tastiest to be had anywhere.