Researchers Made a Cookie From Plastic Waste, but Nobody Has Tasted It Yet

A cookie displayed at the American Chemical Society meeting on August 24 began with an unlikely feedstock: discarded PET plastic and crop waste. A Southern Illinois University Carbondale team used engineered yeasts to rebuild carbon from those materials into food ingredients, then shaped the mixture with a 3D printer.

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The prototype currently costs about $60 per kilogram, before the substantial work needed to prove safety and scale production.

How waste carbon became a food ingredient

The team first used oxidative hydrothermal dissolution, a process involving water and oxygen at high temperature and pressure, to break polyethylene terephthalate (PET) and plant material into smaller molecules. Engineered yeasts then consumed those molecules and produced proteins, fats and acids.

One strain of baker's yeast made vanillin from a compound found in plant biomass. Another yeast, adapted to use ethylene glycol from PET, produced beta-carotene, which the body can convert into vitamin A. The ingredients were mixed with added starch, fiber and sweetener before being extruded into cookies called µBites.

Why this is more than a strange snack

The project grew from NASA's effort to develop food systems that need few resources and create little waste during long missions. NASA's Deep Space Food Challenge also treats remote communities and disaster zones as possible Earth applications.

The more useful idea is not that households will soon bake old bottles. It is that microbes can act as small chemical factories, turning locally available carbon into selected nutrients. NewTqnia has also covered an engineered enzyme route that converts methanol into a plastic building block, showing how biological manufacturing can redirect simple carbon molecules in either direction.

What happens next

The immediate test is not whether the cookie looks edible, but whether independent safety review permits people to eat it. The researchers also need to disclose contaminant testing, nutrient composition and conversion efficiency in enough detail for other laboratories to reproduce the process.

If those checks succeed, the team plans to improve yeast efficiency and make more of the recipe through microbial conversion. The gap between an eye-catching prototype and a dependable food system is still large, but it is now defined by measurable questions rather than a concept alone.