What do cruise ships do with leftover buffet food?

The easiest way for ships to do this is to liquefy the leftover food in an industrial grinder. The food is blended with water until it's a smooth mixture and then either disposed of in port, incinerated, or pumped out to sea when the ship is deep water and away from the coastlines. Simple as that.



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Food waste is a significant problem on cruise ships, with thousands of passengers generating enormous amounts of leftovers daily. Historically, cruise lines have discharged food waste into the ocean, causing serious environmental concerns.

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9 Things to Avoid Eating on a Cruise
  • French Food. While French food is delicious, it's also an overall heavy type of cuisine. ...
  • Sugary Drinks. ...
  • Pizza. ...
  • Daytime Ice Cream. ...
  • Buffet Sushi. ...
  • Already-made Eggs. ...
  • Burger & Fries. ...
  • “One of Everything”


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With so many choices, the buffet table can be an overwhelming place. But those who overfill their plates may have to pay with more than just their pride at some restaurants.

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Cruises are often known for decadence when it comes to food – it's available all day, every day, in unlimited portions, and it's certainly not all healthy. That said, it is possible to eat healthy while on a cruise ship – while still enjoying yourself, too!

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With the exception of a smoothie and an afternoon iced latte, we ate all of our meals/snacks on board the cruise ship. Cruises are often known for decadence when it comes to food – it's available all day, every day, in unlimited portions, and it's certainly not all healthy.

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When a toilet is flushed on a cruise ship, the sewage travels to the onboard treatment plant. Here the waste is filtered before it enters an aeration chamber. The aeration chamber cleans the waste. It is then sterilized using UV light and released into the ocean when clean enough to do so.

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During a typical one-week voyage, a large cruise ship (with 3,000 passengers and crew) is estimated to generate 210,000 US gallons (790,000 L) of sewage; 1 million US gallons (3,800 m3) of graywater (wastewater from sinks, showers, and laundries); more than 130 US gallons (490 L) of hazardous wastes; 8 tons of solid ...

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Food Safety and Buffet Etiquette
  • Place the serving utensil on a plate or spoon holder rather than in back in the food. ...
  • Don't use your hands to serve food. ...
  • Do not eat in the buffet line. ...
  • Most buffets have a glass or plastic sneeze guard that comes down over the food.


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Here's the list of foods she recommends skipping on your next cruise.
  • Sushi. Although cruise lines take safe food handling extremely seriously, nothing is foolproof. ...
  • Soft Serve Ice Cream Cones. ...
  • Scrambled Eggs. ...
  • Old Pizza. ...
  • Communal Condiments. ...
  • Compromised Food. ...
  • More Than One Plate at a Time. ...
  • Dessert During the Day.


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The safest way to eat an egg aboard a cruise ship is to get it hard-boiled, according to the CDC. Runny or undercooked eggs can cause you to fall ill with possible salmonella or listeria poisoning if they aren't cooked to at least 160 degrees.

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You're likely fine eating salads, fruit, and raw seafood on reputable cruise lines—they have strict guidelines for keeping foods clean—but avoid them when you're dining on land, particularly in less developed regions.

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