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  • Researchers presented edible cookies made from upcycled plastic and biomass at the American Chemical Society meeting in August 2026.
  • The process involves breaking down waste into molecules that microbes convert into proteins, fats, and flavorings like vanilla.
  • While intended for extreme environments like Mars missions, critics argue the method cannot solve global plastic waste issues.

A team of researchers has developed a method to create edible cookies from upcycled plastic and agricultural waste, presenting their findings at the American Chemical Society Fall 2026 meeting in Chicago. The project, known as μBites, represents an effort to solve multiple logistical challenges simultaneously by turning carbon-based waste into nutritious food sources. This innovation is particularly relevant for scenarios where resources are scarce, such as deep-space exploration or disaster relief zones.

The core of the technology relies on programming specific strains of yeast to consume broken-down waste materials. The process begins by using water and oxygen under high temperature and pressure to reduce items like PET bottles and corn stalks into smaller molecular components. These fragments are then ingested by genetically engineered microbes, which transform them into essential nutrients including proteins, fats, and organic acids.

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Once the microbial conversion is complete, traditional food ingredients such as fiber, starch, and sweeteners are added to the mixture. This creates a dough-like substance that can be extruded through a 3D printer to form the final cookie product. The resulting snacks are described as protein-rich and designed to be palatable, with recent advancements allowing microbes to produce vanillin for vanilla flavoring and beta-carotene, a precursor to vitamin A.

The research originated from NASA’s Deep Space Food Challenge, which selected teams in 2021 to develop sustainable food systems for long-duration spaceflight. Lahiru Jayakody, a microbiologist at Southern Illinois University Carbondale involved in the study, emphasized the necessity of resource efficiency for missions to Mars. He noted that astronauts on a three-year round trip must utilize every available material to survive extreme conditions.

While the initial concept focused on basic sustenance, recent developments have aimed to improve the consumer appeal of the product. Sandhya Jayasekara, another microbiologist at Southern Illinois University, explained that the team has refined the microbial programming to create a more attractive and friendly food item. The addition of flavor compounds like vanilla is intended to make the cookies more acceptable to potential users who might otherwise hesitate to consume food derived from waste.

Despite the technical achievements, questions remain regarding public acceptance and practical application. No one has yet consumed the cookies, as the team awaits institutional approval for formal taste tests. Preliminary assessments involved participants smelling the printed goods, with most indicating they would eat them in resource-limited situations. However, researchers acknowledged that vanilla flavoring may not be sufficient to overcome consumer hesitation about food derived from plastic.

Critics have raised concerns about the scalability of this approach for addressing broader environmental issues. Jason Hallett, a chemist at Imperial College London who was not involved in the study, argued that the method is unlikely to have significant impact on global plastic pollution. He pointed out that with 400 million tons of plastic waste produced annually, converting it all into food is not commercially viable or feasible as a solution to the waste crisis.

Other experts offered more measured perspectives on the technology’s potential. Stephen Wallace, a chemist at the University of Edinburgh, described the work as an exciting demonstration of what biological upcycling could achieve. While the immediate application may be limited to specialized contexts like space travel, the underlying science showcases new possibilities for converting waste into valuable resources through microbial engineering.

The long-term vision for this technology extends beyond space exploration to addressing global food security. Jayakody highlighted projections that global food demand will rise significantly by 2050, with a substantial portion of the world’s population at risk of hunger. He believes that utilizing microbes to convert waste into food could play a crucial role in meeting these future demands, provided the technology can be further developed and accepted.

As the research progresses, the team aims to make μBites ready for public consumption within a few years. The project highlights the intersection of biotechnology, sustainability, and food science, offering a novel approach to resource management. Whether this method will become a mainstream solution or remain a niche technology for extreme environments remains to be seen as further studies are conducted.

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  • Smithsonian Magazine↗Would You Eat a Cookie Made From Upcycled Plastic? Scientists Propose a New Way to Deal With Waste and Provide Food in Extreme Environments