How cruise lines like Carnival and Costa are reducing food waste at sea

For an industry that serves millions of meals every day, food waste has long been one of cruising’s most complex operational challenges.

Increasingly, however, cruise lines are approaching it as a systems problem—one that begins well before ingredients reach the galley and extends far beyond the ship itself.

Across its global fleet, Carnival Corporation has been developing what it describes as a Less Left Over strategy, aimed at cutting food waste by 50% by 2030. The approach combines supply chain adjustments, onboard operational changes, and partnerships ashore, reflecting a broader shift in how cruise operators are addressing sustainability.

The scale of the challenge is significant. Carnival Corporation operates more than 90 ships, serving approximately 13.5 million guests annually across over 800 destinations. Managing food production at that scale requires not only volume, but precision.

“Even small improvements can have enormous positive impacts when you’re serving millions of meals each year,” said John Haeflinger, SVP, Maritime Policy & Analysis, Carnival Corporation.

At the core of the strategy is a shift towards data-driven provisioning. Before a ship even departs, onboard teams use analytics to forecast consumption patterns and align purchasing volumes with expected demand. The aim is to reduce excess at source, rather than managing waste after the fact.

Once onboard, culinary teams are tasked with maximising ingredient use through standardised preparation methods and menu design. Practices such as repurposing unused bread into croutons or incorporating by-products into new dishes are now embedded into galley operations. Portion sizing has also been refined, balancing guest flexibility with waste reduction.

These measures have already delivered measurable results. Food waste per guest has been reduced by nearly half since 2019, exceeding initial targets ahead of schedule, while also contributing to cost savings by avoiding unnecessary provisioning.

Beyond the ship, sourcing strategies are also evolving. In Alaska, Carnival Corporation has partnered with Seattle-based supplier Charlie’s Produce to connect vessels with regional farms and producers. By sourcing closer to embarkation ports, the company reduces transport-related emissions while improving freshness and shelf life, limiting spoilage before ingredients reach the kitchen.

“It’s pretty cool to think about,” said Jake Sterino of Sterino Farms. “People from all over the world come to Seattle, step onto a cruise ship, and are enjoying produce grown right here in the Northwest.”

For suppliers, the model reinforces a localised supply chain that supports small businesses while aligning with cruise operators’ sustainability targets. “Smart sourcing and strong partnerships help us raise our game,” said Tygann Billow, co-CEO of Charlie’s Produce.

Food waste reduction efforts also extend to surplus management. Where excess food cannot be avoided, cruise lines are increasingly exploring donation programmes in partnership with local food banks. Within Carnival Corporation, Costa Cruises has established regulatory frameworks in multiple countries to enable the offloading of prepared meals to community organisations, an initiative that has so far facilitated the donation of more than 300,000 portions.

Where donation is not possible, waste processing technologies are used to minimise environmental impact. Systems such as biodigesters, dehydrators, and grinders reduce food waste volume onboard, supporting compliance with maritime regulations while limiting discharge.

Taken together, these measures reflect a broader industry trend towards integrating sustainability into core operations rather than treating it as a standalone initiative. For cruise lines, reducing food waste is no longer solely an environmental consideration, but a logistical and economic one as well.

As operators continue to expand into new regions and scale up capacity, the ability to manage food efficiently across complex global supply chains is becoming a defining feature of modern cruise operations—one measured not only in what is served, but in what is left behind.