The short version
- Scientists have successfully converted plastic waste into edible proteins and fats using specialized yeast strains.
- The technology addresses logistical challenges for multi-year space missions by recycling carbon-based materials.
- Human consumption trials are pending institutional approval, though the product has received positive sensory feedback.
A research team funded by NASA has demonstrated a method for converting plastic waste into edible food products, specifically designing the output to resemble cookies. The project, led by microbiologist Dr. Lahiru Jayakody at Southern Illinois University Carbondale, represents a significant step in developing sustainable life-support systems for deep space exploration. By utilizing genetically reprogrammed yeast, the researchers can transform polyethylene terephthalate, commonly known as PET, into essential nutrients including proteins and fats.
The underlying logic of the project rests on the chemical similarity between plastic and food. Both materials are primarily composed of carbon. Jayakody noted that his laboratory focuses on plastic upcycling technologies, which prompted the investigation into whether this process could be extended to produce nutrition. The resulting mixture is processed through a 3D printer to form disc-shaped biscuits, offering a structured and familiar format for consumption in microgravity environments.
The production process begins with the breakdown of PET, a material frequently used in single-use water bottles. This plastic is subjected to high temperatures and pressure in the presence of water and oxygen, a procedure that digests the tough polymer into smaller, carbon-rich molecules. These molecules are then introduced to yeast strains that have been engineered to metabolize them. The yeast converts the carbon source into new biological compounds, creating a slurry rich in nutritional value.
In addition to the primary nutrient conversion, the team employed a different strain of yeast to generate vanilla flavoring from plant biomass. This step addresses the psychological and sensory aspects of space food, which often suffer from monotony and lack of appeal. The combination of the protein-fat slurry with starch and the added flavoring results in a product that researchers report receives high marks for aroma, despite not yet being consumed by humans.
Safety protocols require institutional sign-off before any human tasting can occur. Jayakody confirmed that the team is awaiting approval to conduct tests on people, meaning the current data relies on chemical analysis and sensory evaluation of smell rather than taste or digestibility studies. The findings were presented at a meeting of the American Chemical Society in Chicago, marking a public debut for this specific application of microbial upcycling.
The initiative was supported through NASA’s Deep Space Food Challenge, which seeks innovative solutions for feeding astronauts on extended missions. A round-trip journey to Mars is estimated to take three years, requiring systems that maximize resource efficiency. In such extreme conditions, the ability to recycle waste materials into food becomes critical for survival, reducing the mass of supplies that must be launched from Earth.
Currently, the production cost stands at approximately $60 per kilogram. However, the researchers anticipate that improvements in yeast efficiency and scaling up manufacturing processes will drive these costs down significantly. The economic viability is a key factor in determining whether this technology can transition from experimental prototypes to standard provisions for space agencies or other high-stakes environments.
Beyond aerospace applications, the team suggests potential uses on Earth. Extreme environments such as submarines or disaster zones could benefit from compact, recyclable food sources. Furthermore, the technology may offer a dual solution to global plastic pollution and rising food demand. With projections indicating a 35% to 56% increase in global food demand by 2050, microbial conversion of waste presents an alternative pathway for sustainable agriculture.
Despite the technical success, widespread adoption faces cultural hurdles. The concept of consuming food derived from plastic may require significant public education and acceptance. While the scientific community views this as a breakthrough in resource management, consumer perception remains an uncertain variable that could influence the future deployment of such technologies in civilian markets.
Sources behind this briefing
Go to the original reporting
- The Guardian US↗‘Cookies’ made from plastic may be on the menu for future astronauts
