An exploratory study that included Ecuadorian beer identified synthetic polymers in a pooled food-category subsample and reported estimated particle concentrations for craft and industrial beer. Those estimates are based on subsampling and extrapolation. They are not counts in which every observed object was confirmed as plastic. The reviewed evidence does not establish a typical concentration for beer sold elsewhere or a human health effect from drinking the tested beers.1
What this page covers
Beer is a finished beverage with ingredients, brewing equipment, filtration, and packaging that may all affect particle observations. A food or beverage paper belongs on this page only when its actual samples include beer or when it provides clearly labeled methodological context. Milk, soda, cold tea, and experiments on empty beverage cups do not become beer measurements because they were filed in the same library folder.
What the beer study found
Diaz-Basantes and colleagues examined beer alongside honey, skim milk, and soft drinks. The beer samples were packaged in glass, and the authors separated craft and industrial processing groups. The paper reports the following category averages. Both carry the same limitation: the plastic share came from chemical analysis of a selected fraction of the observed objects, rather than confirmation of each counted object.1
Scroll horizontally for methods and limitations.
| Sample group | Paper-reported estimate | Measurement basis | Interpretation |
|---|---|---|---|
| Craft beer | 32 estimated MPs/L | Microscopy with FTIR subsampling | Exploratory source estimate; no universal craft-beer rate. |
| Industrial beer | 47 estimated MPs/L | Microscopy with FTIR subsampling | Different processing group, with no basis for a current market ranking. |
Across the food categories, FTIR identified plastic in 64 of 530 sampled objects. The remaining analyzed material included cellulose and inorganic objects. The source extrapolated this plastic fraction to the wider microscopic observations. That distinction matters: a table of fibers and fragments records particle appearance, while the polymer estimate depends on a separate identification step. The denominator in the chemical subsample is not a count of beer samples.1
How the particles were measured
The workflow diluted the beverage, used sieving and hydrogen peroxide treatment, filtered the sample, and used sonication during particle transfer. Optical microscopy counted objects and recorded dimensions. FTIR then provided a chemical fingerprint for a selected set. The paper identified polypropylene, low- and high-density polyethylene, and polyacrylamide across the analyzed foods. It does not show that every polymer occurred at the same proportion in each beer.1
The dimensions attached to the raw fiber and fragment observations should not be presented as a chemically confirmed beer-plastic size distribution. Sample preparation also involves sieving, filters, heating, and transfers. A filter pore size alone cannot establish complete recovery or a validated minimum size for identified plastics. This page therefore does not assign a precise polymer-confirmed size window to the beer estimates.1
Contamination and comparison limits
The researchers described air cleaning, laminar flow, and blank runs. Fibers were found in the procedural blanks, and the inspected methods do not clearly show how those counts were subtracted from the beverage estimates. The article also differs between its methods sample count and the beer rows in its results table. Those limitations narrow how confidently the reported averages can be used.1
A separate South African beverage study adds context on identification. It used microscopy, exclusion staining for natural material, and Raman analysis of a selected fraction. It found several synthetic polymers across alcoholic and nonalcoholic samples and could not assign contamination to one packaging material. Its main methods group the alcoholic samples together, so that aggregate is not used here as a beer-specific concentration. This keeps a category label from becoming a stronger claim than the source supports.2
What the findings do and do not establish
Glass packaging does not itself demonstrate that the liquid contains no plastic particles. Equally, detection in glass-packaged beer does not identify the cap, brewery equipment, source water, or airborne fallout as the proven cause. Distinguishing these routes would require comparisons designed to isolate them. The beer survey measured material in products; it did not measure absorption, disease, or a clinical response in drinkers.12
The available review supports an evidence page, with the estimates visibly qualified, rather than a single score for all beer. More direct beer studies with comprehensive polymer confirmation, numerical blank reporting, validated size coverage, and well-described sampling are needed to test whether results agree across products and places. The current numbers should remain attached to their source, method, and processing group.
Regulatory status
The supplied EFSA statement is a dated scientific assessment that calls for improved methods and quality assurance. Its historical legislative description is not treated as a complete statement of current law. Neither that assessment nor the drinking-water measurement decision supplies a particle limit for this food category.34 A research concentration is not a product compliance determination. See source scope and versions.
References
- Microplastics in Honey, Beer, Milk and Refreshments in Ecuador as Emerging ContaminantsResearch article
- Occurrence and characteristics of microplastics in South African beveragesResearch article
- Presence of microplastics and nanoplastics in food, with particular focus on seafoodScientific statement
- Commission Delegated Decision (EU) 2024/1441: methodology to measure microplastics in water intended for human consumptionLegal instrument