Researchers at Southern Illinois University Carbondale have used engineered yeast to convert plastic bottles and agricultural waste into protein-rich cookies [1].
This development addresses two critical global challenges: the proliferation of plastic pollution and the need for sustainable food sources during long-duration space missions [2]. By transforming non-biodegradable waste into edible nutrients, the process suggests a future where waste management and food production are integrated.
The project, which received funding from NASA, focuses on PET plastic—the material commonly found in disposable water bottles [3]. Scientists utilized a specific strain of engineered yeast to break down the plastic polymers and combine them with crop waste [1]. The resulting material was then processed into vanilla-flavored, 3D-printed snacks known as µBites [2].
The research team developed this method to create a closed-loop system for nutrition [3]. In a terrestrial setting, this could reduce the amount of plastic entering landfills and oceans. In space, where resources are finite and transporting food is costly, the ability to recycle waste into protein would be a significant advantage for astronauts [2].
The cookies are designed to be nutrient-dense to meet the dietary requirements of those in isolated environments [3]. While the process began in 2026, the focus remains on refining the conversion efficiency of the yeast [1].
The use of 3D printing allows the researchers to control the texture and shape of the µBites, ensuring they are palatable and easy to produce in a laboratory or spacecraft setting [3]. This approach moves beyond traditional food manufacturing by treating waste as a raw ingredient rather than a pollutant [1].
“Researchers used engineered yeast to convert PET plastic from bottles and agricultural waste into protein-rich cookies.”
This research represents a shift toward 'circular bio-economy' technology, where synthetic biology is used to remediate environmental damage while producing value. If scalable, the ability to upcycle PET plastic into human-grade protein could reduce reliance on traditional agriculture and mitigate the impact of plastic waste on global ecosystems.
