Avoid foods that aren't usually in your diet. It can be thrilling to try every dessert or an exotic dish, but too many new and unusual foods can overwhelm your digestive system.
Fresh salad and condiments might seem like a safe and healthy option, but if they've been handled by multiple people, they can be a breeding ground for bacteria.
For cold foods, ensure they're kept on ice that's still frozen. If you witness another sailer mishandling the food, notify the buffet staff, and ask for a fresh serving.