Heavy metals in Chicken noodle soup

This page draws on evidence from FDA. The complete citation list is at the bottom of the page.

Overview

This ingredient stub was created during the FDA FY2018-FY2020 Total Diet Study element-results ingest so future source ingests have a stable destination for this food matrix. FDA reports this item as TDS Food 155, “Soup, chicken noodle, canned, condensed, prepared with water.” FY2018-FY2020 TDS Elements Analytical Results

Regulatory limits that apply

EU Regulation 2023/915 (Commission Regulation (EU) 2023/915 cadmium maximum levels) and the general contaminants framework (EU Regulation 2023/915 maximum levels for contaminants in food) do not set a single composite limit for chicken noodle soup as a finished product; rather, the limits for each constituent ingredient (cereal products, chicken meat, vegetables) apply to those components as assessed in the final product. Codex CXS 193-1995 (Codex Alimentarius — Maximum Levels for Cadmium in Food) similarly addresses ingredient categories rather than composite dishes. No specific US FDA action level applies to canned chicken noodle soup; the FDA Closer to Zero program (FDA Closer to Zero — Program Overview) covers infant and toddler food categories. For tin in canned products, the Codex ML for tin in canned foods is 200 mg/kg; EU limits are 200 mg/kg for non-beverages. The TDS data showing tin (Sn) at or below reporting limits is consistent with modern canned products meeting these limits comfortably FY2018-FY2020 TDS Elements Analytical Results.

Mitigation options

Sourcing levers

For manufacturers, specifying low-cadmium wheat flour for the noodle fraction is the highest-leverage sourcing decision, as the noodle component drives the cadmium signal in the final product. Selecting chicken suppliers who use clean-bone processing (muscle-only broth rather than bone-in broth) reduces potential lead contribution from skeletal calcium. Specifying enamel-lined cans minimises tin migration risk.

Agronomic levers

Agronomic levers apply primarily to the wheat ingredient used in the noodle fraction; see Wheat flour for wheat cadmium mitigation levers. The chicken, vegetable, and salt fractions do not offer meaningful agronomic levers relative to wheat.

Processing levers

Using muscle-only chicken stock rather than bone-derived broth reduces the lead contribution from the broth fraction. Ensuring adequate can-lining quality limits tin migration. Formulating with a higher water-to-noodle ratio dilutes the cadmium contributed by the noodle fraction in the final product serving.

Formulation levers

Reducing the noodle fraction of the recipe or substituting rice-based noodles (which carry different metal profiles depending on rice origin) for wheat noodles changes the cadmium source. Adding more vegetables relative to noodles may increase nickel but typically does not materially increase cadmium or lead. Including vegetables with lower soil-contact cadmium (peas, corn) rather than higher-accumulating types changes the vegetable-fraction metal contribution.

Testing and QC levers

Given the low cadmium concentrations observed in the TDS data FY2018-FY2020 TDS Elements Analytical Results (median 2.6 ppb, maximum 2.8 ppb in prepared product), routine lot-level testing for chicken noodle soup is lower priority than for higher-risk categories. For manufacturers sourcing wheat from high-cadmium regions, testing the flour prior to noodle production provides earlier-stage quality control. Tin testing is warranted for any canned soup product where enamel lining quality cannot be confirmed.

Packaging and storage levers

Enamel-lined cans substantially reduce tin migration. For products stored in damaged or corroded cans, tin migration increases and is a relevant quality defect. No specific metal packaging interaction has been identified for chicken noodle soup beyond the tin-can pathway.

Why this commodity accumulates heavy metals

Chicken noodle soup is a multi-ingredient composite product whose metal burden is the sum of contributions from each ingredient stream. Cadmium enters primarily through the wheat-based noodle component: wheat grain accumulates cadmium through root uptake from soil, and whole-wheat or enriched-wheat noodles carry this signal into the final product. Nickel is a secondary concern that derives from both the noodle fraction (wheat contains moderate Ni) and the vegetable components (celery, carrots, peas) commonly included in the soup recipe. Chicken muscle itself contributes very little to lead (Pb), cadmium (Cd), or nickel (Ni); the broth component, if prepared from bones, may contribute trace lead through leaching from the skeletal calcium matrix. The canned format introduces the potential for tin (Sn) from the can interior, though modern cans use enamel linings that substantially reduce tin migration. The FDA Total Diet Study FY2018-FY2020 measured canned condensed chicken noodle soup prepared with water and found cadmium detectable at a median of 2.6 ppb and nickel at a maximum of 62 ppb across 3 composite samples FY2018-FY2020 TDS Elements Analytical Results; the small sample size limits inference.

Heavy metal contamination profile

This table summarizes the available occurrence evidence for each metal. A data gap means the literature was reviewed for this commodity and metal but no usable occurrence data was found. Key sources link to contributing studies.

FDA TDS FY2018-FY2020 Evidence

The normalized row-level data for this TDS food is stored in data/evidence/fda_tds_fy2018_2020_element_results_samples.csv, with per-food/per-analyte summaries in data/evidence/fda_tds_fy2018_2020_summary_by_food_analyte.csv. Concentrations are retained as FDA reported them, with the reporting-limit column preserved separately; reported zeroes are not rewritten as <LOD unless a source explicitly says to do so. FY2018-FY2020 TDS Elements Analytical Results

Routing

This ingredient is listed in the ingredient index and in the FDA Total Diet Study source list.

Contamination Profile State

Per-analyte state — populated, in progress, or declared data gap — is carried authoritatively in the machine-readable contamination_profile frontmatter and the contamination-profile table above. Ingredient-level values belong here; finished-product values belong on the relevant product-category page.

FDA TDS FY2018–FY2020 source observations

FDA measured the prepared foods named below. Each row describes that food and preparation, not every form of this ingredient. Values are µg/kg (ppb) on the FDA sample basis. ND means not detected; it is not a measured zero. Reporting limits can vary between composites. FY2018-FY2020 TDS Elements Analytical Results

Ranges by source, region, and variety

The FDA TDS FY2018-FY2020 provides the primary quantitative reference, with 3 composite samples of canned condensed chicken noodle soup prepared with water reporting cadmium at a median of 2.6 ppb, nickel at a maximum of 62 ppb, and all other measured metals (Pb, total arsenic (tAs), total mercury (tHg), chromium (Cr), U) below reporting limits FY2018-FY2020 TDS Elements Analytical Results. The very small sample size (n=3) limits confidence in these distributional estimates. Variation across brands and product lines would be expected primarily from differences in the noodle-fraction wheat source (which drives Cd), the proportion of bone-derived versus muscle-only broth (which affects Pb), and the vegetable complement (which affects Ni). Homemade chicken noodle soup would vary from canned product in tin content (absent without canned ingredients) and in broth lead content depending on whether bone-in chicken is used and cooking time.

Processing effects

Canning involves cooking the soup at high temperature under pressure (retort processing), which converts the product to a ready-to-heat form. The acidic content of the soup (from tomato-based additions in some recipes, or from natural acidity of ingredients) can influence tin migration from can interiors, but modern enamel-lined cans substantially limit this; Sn was below reporting limits in all three TDS samples FY2018-FY2020 TDS Elements Analytical Results. The preparation instruction to dilute condensed soup with an equal volume of water reduces all concentrations by approximately half relative to the condensed product; the TDS values represent the prepared (diluted) product. Extended cooking of bone-in chicken to make broth before soup assembly increases the leaching of lead from bone surfaces into the liquid; the TDS product is manufactured with controlled processes that likely minimise this pathway compared to home preparation from whole bone-in chicken.

Ingredient-derivative risk

Chicken noodle soup is already a composite product rather than a raw ingredient, and its derivatives are primarily variations in recipe formulation (see Mitigation options below). Dried soup mixes and instant noodle packets that carry the chicken noodle soup flavour profile would concentrate all metals relative to the prepared liquid product; they are not characterised separately in the current corpus. Soup stock or broth sold separately as a component derives from a similar process and would carry the bone-lead pathway more directly than the finished composite.

Interpretation of source evidence

Source observations and population estimates are different. A non-detect supplies a reporting-limit bound for the tested composites. It does not show that this ingredient contains zero metal. Where a previous profile lacked matching source, species or basis support, its generic concentration has been withdrawn; the available source evidence is kept below.

Pb. FDA source observations are non-detects at the reporting limits below. They do not estimate a zero population concentration; other literature remains separate context.

tAs. FDA source observations are non-detects at the reporting limits below. They do not estimate a zero population concentration; other literature remains separate context.

tHg. FDA source observations are non-detects at the reporting limits below. They do not estimate a zero population concentration; other literature remains separate context.

Cr. FDA source observations are non-detects at the reporting limits below. They do not estimate a zero population concentration; other literature remains separate context.

uranium (U). FDA source observations are non-detects at the reporting limits below. They do not estimate a zero population concentration; other literature remains separate context.

References

Works cited in this page’s text, in first-appearance order. See Sources for this page’s source inventory. Each title links to a source record with bibliographic details, reported findings, and document provenance.

1. FY2018-FY2020 TDS Elements Analytical ResultsU.S. Food and Drug Administration · FDA Total Diet Study · 2022 · www.fda.govDataset

Sources

Sources catalogued for this page. The last column says how each source is used here.

Update history

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