Does Canned soup have microplastics?
The short answer
Less than a pouch, more than a jar. The can body cannot shed a polymer, but a thin internal liner separates the metal from the food — and the food is cooked inside the sealed can, which is the most migration-favourable moment there is.
Why Canned soup scores 35
Retort sterilisation happens after sealing, so the soup is cooked against the liner
Soups are often acidic — tomato in particular — and warm acidity is what liners are there to resist
Shelf lives measured in years mean slow migration continues long after production
The liner is microns thick, against the millimetres of a plastic pouch or tub wall
Where the 35 comes from
Five components, added. The page renders the parts rather than a stored total, so the number cannot disagree with the reasoning behind it.
- Packaging contact
- 10 / 30
- Use conditions
- 6 / 25
- Measured release
- 6 / 25
- Polymer behaviour
- 4 / 10
- Processing
- 9 / 10
What material touches the contents, over how much surface area, for how long. Glass and steel score near zero here; a film pressed against fatty food scores near the top.
Heat, abrasion, flexing, repeated opening, reuse beyond design life. The same bottle scores differently in a fridge and in a hot car.
What a laboratory actually counted, for this product or its category. A high number here means real particles were measured, not that the material looks suspicious.
How this specific polymer behaves — brittleness, fat solubility of its additives, thermal stability, whether it is a polymer named in existing restrictions.
What happened before you bought it. Retort sterilisation inside the pack, hot-filling, and pressurised brewing all happen at the most migration-favourable moment.
What we don't know
Liner composition is proprietary and rarely disclosed, and almost all published work on can liners concerns bisphenols rather than particles. Nobody has counted plastic particles in canned food. What can be said with confidence is the structural comparison: a liner is a far smaller polymer mass than a pouch or a tub.
This section is on every page in the database, including the ones where the answer is comfortable. How evidence grades work →
Better options
Ordered by how much they change, not by how much they cost.
Soup in a glass jar
the same product with no liner at all, where the shop stocks it
Carton soup
thin PE film rather than an epoxy liner — a lateral move, not an upgrade
Made from fresh or frozen
no retort step anywhere in the chain
Check the one in your kitchen
This page scores Canned soup as a product. Formulations, packaging and suppliers change, and the specific item you own has its own condition — a scratched pan and a new one are not the same object. Scan yours for a score built from what is actually in front of you.
Scan my packaged foodSources behind this score
Each with the finding we use it for and the limitation that finding carries — because a study quoted without its boundaries is how this subject got so noisy.
- report2026
Earth Action 2026 — Estimated roughly 1,000 tonnes of microplastics migrate from packaging into food and drink annually — about 130 mg per person per year — with PET bottles responsible for around a third, and found UV exposure can raise release up to 100×.
Limitation: An industry-funded modelling exercise, not a laboratory study, and not peer-reviewed. We use it for the relative ranking of formats rather than for any absolute number.
- peer-reviewed2020
Du 2020 — Take-out containers released 3–29 microplastic particles each, with polypropylene containers the most common source.
Limitation: Counts particles above the detection limit of the method used, so it says nothing about the nanoplastic fraction, which other work suggests dominates by number.
- agency2026
US FDA — States that current scientific evidence does not demonstrate that the levels of microplastics detected in foods pose a risk to human health, while listing detection and characterisation as a research priority.
Limitation: A statement about the state of evidence, not a finding of safety. "Not demonstrated to be harmful" and "demonstrated to be harmless" are different claims, and the agency is explicit that the research is ongoing.