Yesterday's Croissants: How Paris Is Turning Stale Pastries Into Zero Waste

Walk into most Paris bakeries and you’ll see the same ritual: closing time arrives, unsold croissants vanish into the trash, and 50,000 perfectly edible pastries get pitched every single month across the city. It’s a routine so normalized that nobody questions it—until you meet someone like Martin Herbelin, the 35-year-old co-founder of Demain, who looked at that waste and saw an opportunity instead.

Demain, which means“tomorrow”in French, launched in 2023 with a deceptively simple concept: collect yesterday’s bread and pastries from more than 20 artisan bakeries, then resell them the next day at roughly half price. A buttery croissant for €0.50. A thick loaf of pain de campagne sourdough that normally costs €8 for just €4. Traditional baguettes under a euro. It sounds small until you realize that about 50,000 of these goods are being salvaged from landfills every month, and the model has grown so successfully that Demain opened a third location in June 2026.

The economics alone tell the story: French bakeries waste about 10 percent of their daily output, which adds up to 345,000 metric tons per year with an equivalent value of more than one billion euros. Most of that waste happens because redistribution is impractical and costly, day-to-day quantities are unpredictable, and fragile items like croissants don’t travel well. Herbelin’s answer was to get creative. Stale croissants get flattened and caramelized into“smash croissants.”Old pains au chocolat are baked together into a giant“Chocobread.”Even breadcrumbs find their way back into fresh loaves made on site. On average, Demain sells 95 percent of the inventory it brings in—a conversion rate that would make most retailers jealous.

What makes this work isn’t just resourcefulness; it’s messaging. As food marketing specialist Béatrice Siadou Martin from the University of Montpellier points out, upcycled food succeeds when consumers see a clear link between their action and impact. Croissants are easy to understand. A pastry you recognize, sold at a price that makes sense, with zero guilt. That’s why Demain’s hyperlocal model—sourcing from renowned bakeries like Land&Monkeys, Terroirs d’Avenir, and BO&MIE—resonates more than abstract sustainability messaging.

The story here isn’t really about pastries, though. It’s about a global food waste crisis that’s become almost invisible through routine. Roughly one-third of all food produced for human consumption gets lost or wasted. Europe tosses 58 million metric tons annually. The U.S. throws away nearly 60 million tons every year—almost 40 percent of its entire food supply. That’s not a supply problem; it’s a systems problem. And while Herbelin acknowledges that individual responsibility gets overstated (business and industrial waste are the real culprits), small-scale initiatives like Demain are proving that change doesn’t have to be abstract or top-down. It can taste like yesterday’s sourdough at today’s prices, made accessible to people who might have otherwise grabbed a mass-produced baguette from the supermarket.

The impact is already spreading beyond Paris. Herbelin reports interest from parties in Montreal, Brussels, and London. In France, government policy has helped—the 2020 anti-waste law for a circular economy (Agec) introduced tax incentives for businesses that donate unsold food and set a target to halve waste across the entire food chain by 2030. But the real revolution happens on the ground, in bakeries picking up yesterday’s goods and customers discovering that artisanal quality doesn’t have to cost a fortune. As HopHopFood co-founder Michel Montagu puts it:“Everyone brings their own stone, every actor can mobilize. It’s the multiplicity of all these initiatives that will bring change.”Sometimes that change arrives wrapped in paper, still warm from being rebaked, and priced at half what you’d normally pay.