Nando's and Subway are among 30 new signatories of Wrap's voluntary Courtauld Commitment 2025.
The 10-year commitment seeks to reduce the resource intensity of the UK's food and drink by one-fifth.
Since its launch in March and with the new signatories, Courtauld 2025 now includes food and drink businesses representing 95% of the 2016 UK food retail market. It also includes major brands, manufacturers, hospitality and foodservice companies.
The initiative is expected to save the economy £20b and will see leading organisations from across the food chain work together to tackle food and drink waste, greenhouse gas emissions and water intensity.
Other organisations to have signed include Quorn, the National Association of Care Catering, the Royal Academy of Culinary Arts and Soil Association.
David Moon, head of sustainable food at Wrap, said: "Building connections right across the supply chain makes Courtauld 2025 a powerful voluntary agreement and we are delighted with the desire for action shown from such a range of signatories.
"Already we've set up a number of industry-led working groups that are meeting to address important issues. These range from water and waste to sustainable design and buying; to areas as diverse as fresh produce, meat protein, dairy, redistribution and hospitality and food service.
"Later this year we will introduce a reinvigorated Love Food Hate Waste campaign, working in partnership with these big names with the aim of delivering the step change that's required to push forward the work on household food waste."
Greene King, KFC, Pizza Hut, Compass, Sodexo, OCS, Bidvest and Apetito were among the first 100 companies to sign the voluntary agreement in March.
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