- University of Illinois researchers have developed 3D-printed vanilla cookies made from plastic bottles and corn waste using genetically engineered yeast, though the product has not yet been tasted.
- The project, originally part of NASA’s Deep Space Food Challenge, aims to address both plastic pollution and food scarcity by converting PET plastic into edible protein.
- Food safety experts warn that genetically engineered yeast can “unexpectedly produce toxins or allergens,” citing the 1989 Showa Denko tragedy that killed 37 Americans.
- The scientists have a patent application pending for their production system, which uses a 32-step process to break down materials before fermentation and 3D printing.
- Critics argue the environmental footprint of lab-grown bioreactor food is massive and that the cookies cannot meaningfully address plastic pollution at scale.
Southern Illinois University Carbondale researchers have created 3D-printed vanilla-flavored cookies derived from plastic bottles and agricultural waste using CRISPR-engineered yeast—a technology originally funded by NASA for deep space missions. The scientists presented their findings Aug. 24, 2026, at the American Chemical Society fall meeting in Chicago, but have not yet received university approval to taste the product. Food safety experts and environmental watchdogs are raising alarms about potential health risks and questioning whether the process offers a realistic solution to plastic pollution.
The technology: From trash to treats
The process, called oxidative hydrothermal dissolution, uses heat, water, pressure and oxygen in a 32-step sequence to break down polyethylene terephthalate (PET) plastic bottles and discarded corn stalks into components digestible by engineered microbes. Yeast strains modified through CRISPR gene editing then convert these components into proteins, fats and flavorings—including vanillin for vanilla scent and beta-carotene for golden color and vitamin A.
The resulting ingredients are mixed with fiber, starch and sweeteners, then extruded through a 3D printer to form protein-rich cookies dubbed “µBites.” The scientists said the cookies currently cost about $60 per kilogram to produce but hope scaling up and improving yeast efficiency will lower the price.
Lead researcher Lahiru Jayakody told NewScientist the cookies have a “pleasant, appealing aroma” and predicted they would taste good, though no human has consumed them.
Safety questions and historical precedent
GMO food expert Claire Robinson, founder of GMWatch, criticized the lack of safety testing, noting that genetically engineered yeast and bacteria can “unexpectedly produce toxins or allergens.” She pointed to the 1989 Showa Denko disaster, when genetically engineered tryptophan killed 37 Americans and sickened more than 1,500.
Robinson said she would not “dignify the product by expecting lab animals to eat it, let alone humans,” and called the environmental claims “highly questionable.” The energy and resource demands of lab-grown bioreactor food are substantial and difficult to scale to commercial levels, she added.
Environmental claims unsubstantiated
The researchers argued the technology could address both plastic pollution—which accounts for 3.4% of global emissions—and rising food demand, projected to increase 35-56% by 2050. But critics contend the solution is a distraction. Robinson said the proper approach to plastic pollution is phasing out plastic production worldwide and improving recycling systems with deposit programs.
The American Chemical Society reported that the team hopes µBites will be ready for public consumption within a few years and could sustain life in disaster zones, submarines or colonies on the moon and Mars.
Fringe theory lacks evidence, raises more questions
The plastic-to-cookie technology represents an inventive approach to two pressing global issues, but significant gaps remain before it can be considered viable. The absence of taste testing, limited safety data and unresolved questions about scalability and environmental footprint mean the product is years—if not decades—from reaching consumers. For now, the science demonstrates that microbes can transform waste into edible compounds, but whether that transformation yields safe, sustainable food for human consumption remains unproven.
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