White bread

Overview

FSA/Fera measured this ingredient or non-infant-specific food composite in Table 6 of the FS102048 survey. Exact concentration values remain in progress until Table 6 is parsed into structured ingredient rows with less-than and semi-quantitative flags preserved. Survey of metals in commercial infant foods, infant formula and non-infant specific foods

Why this commodity accumulates heavy metals

White bread is produced from refined wheat flour (typically enriched white flour in the US) that has had the bran and germ fractions removed during milling. This processing step is the defining feature of white bread’s metal profile: Cd partitions preferentially to the bran and germ of the wheat kernel, so refined flour carries approximately half the Cd of whole-wheat flour. The endosperm-dominant composition of white flour therefore results in a materially lower Cd content than whole-wheat bread or bran-enriched products made from the same grain. FDA TDS FY2018-FY2020 data (n=27) for enriched white pre-sliced bread confirm this pattern, with Cd showing a median of 29 ppb and a maximum of 37 ppb (FY2018-FY2020 TDS Elements Analytical Results). Nickel in the same dataset has a median of 79 ppb and a maximum of 120 ppb, consistent with wheat’s background Ni contribution even through refining. Lead is near detection limits across the distribution (max = 23 ppb). The primary metal accumulation pathway for all values present is soil uptake by the wheat crop; commercial yeast, salt, and water additives in bread manufacturing contribute negligible metals.

Heavy metal contamination profile

Per-analyte snapshot derived from the machine-readable contamination_profile in the frontmatter above. data gap indicates the literature has been reviewed for this commodity-analyte combination and no usable occurrence data was found (a finding, not a placeholder). The Key sources column shows the top 2-3 contributing sources by year and sample size, with numbered wikilink aliases.

Synthesis basis and censoring treatment

The total mercury cell previously read typical [0,0] with a p95 of 0. This is a censored-zero artifact: the FDA Total Diet Study returned mercury non-detect in all 27 white enriched pre-sliced bread composites at a 1 ppb reporting limit, which is a bound and not a measured zero (FDA 2022). The cell is now expressed as left-censored at 1 ppb.

The two other national studies confirm that mercury in white bread lies below the reporting limit rather than absent. The UK Total Diet Study placed white sliced bread near 0.3 ppb and other bread composites below 0.5 to 1 ppb (Baxter et al. 2015), and the Irish Total Diet Study found mercury below its 5 ppb detection limit in nearly all cereal samples, with detectable mercury concentrated in fish rather than cereals (FSAI 2016). The value is therefore a below-limit bound with a typical range of 0 to 1 ppb, reported as total mercury and not methylmercury.

Routing

This node is linked from the ingredient index and source routing 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 Evidence

FDA’s FY2018-FY2020 Total Diet Study dataset includes this page’s routed matrix as TDS Food 58, “Bread, white, enriched, pre-sliced.” The normalized row-level data 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 reporting limits preserved separately; reported zeroes are not rewritten as <LOD without a source-specific rule. FY2018-FY2020 TDS Elements Analytical Results

FDA TDS FY2018-FY2020 Occurrence Values

FDA Total Diet Study FY2018-FY2020 reports prepared/composite-food concentration distributions for this ingredient as TDS food “Bread, white, enriched, pre-sliced” (FY2018-FY2020 TDS Elements Analytical Results). Values are in ppb-equivalent on the basis FDA reported. The full sample-level data are stored in data/evidence/fda_tds_fy2018_2020_element_results_samples.csv; per-analyte distributions in data/evidence/fda_tds_fy2018_2020_summary_by_food_analyte.csv. These distributions count as one source under Persistent Wiki Ingest Rule synthesis discipline; numerical values stay in body scratch until a second independent source is integrated.

Ranges by source, region, and variety

FDA TDS FY2018-FY2020 data (n=27) for enriched white pre-sliced bread provide the most detailed available US dataset for this matrix (FY2018-FY2020 TDS Elements Analytical Results). The Cd distribution ranges from 18 ppb (minimum) to 37 ppb (maximum) with a median of 29 ppb, indicating a relatively narrow and consistent Cd range for a commercially standardised product. Ni ranges from 0 to 120 ppb (median 79 ppb). The FSA/Fera FS102048 UK survey provides a second data point that remains quantitatively unstructured in the current corpus (Survey of metals in commercial infant foods, infant formula and non-infant specific foods). White bread from different wheat sourcing regions would be expected to vary in Cd concentration in proportion to the wheat grain’s Cd, but the refining step that removes the bran compresses the upper end of the distribution relative to whole-wheat products, resulting in a narrower Cd range across brands than is observed for whole-wheat bread.

Processing effects

The milling step that produces white flour from wheat removes the bran and germ, reducing Cd and Ni content relative to the whole grain. Enrichment of the flour (adding back iron, thiamine, riboflavin, niacin, and folic acid to meet regulatory standards) uses food-grade nutrient forms that do not contribute heavy metals at measurable concentrations. Bread-making itself involves mixing, fermentation by yeast, proofing, and baking at 180 to 220 degrees Celsius. None of these steps remove or add heavy metals. The leavening step (yeast fermentation) produces CO2 and alcohol and alters the bread matrix physically and chemically, but has no established effect on metal concentrations in the finished loaf. Metal concentrations in finished white bread on a dry-weight basis are therefore determined entirely by the metal concentrations in the input flour.

Ingredient-derivative risk

White bread is one of the lowest-risk positions on the wheat-product metal spectrum because bran removal during milling is the most effective single processing step for reducing Cd in wheat-derived foods. The risk gradient within the bread category runs from white bread (lowest Cd) through mixed-grain breads to whole-wheat bread and bran-enriched breads (highest Cd). White bread used in sandwiches, toast, or as a food-service base product carries the same metal profile as the retail loaf. Breadcrumbs made from white bread are used as coatings in processed products; the breadcrumb fraction contributes its white-bread metal profile proportionally to the finished product by weight.

Mitigation options

Sourcing levers

Sourcing refined white flour from wheat varieties and growing regions with lower background Cd is the primary lever. While bran removal already substantially reduces Cd relative to whole grain, flour from lower-Cd wheat grain will produce lower-Cd white bread. Supplier wheat sourcing specifications and periodic commodity testing are the operationalisation of this lever.

Agronomic levers

No quantified data on this lever in the current corpus; section will be expanded when relevant evidence is ingested.

Processing levers

The milling step to white flour is already the most impactful single processing intervention for reducing Cd in wheat products. Further Cd reduction within the white-bread category is limited by the endosperm composition of the grain itself. Using municipal tap water from low-Pb systems (or filtered water) for dough mixing eliminates any Pb contribution from water, though the Pb contribution from process water is negligible under normal conditions.

Formulation levers

No quantified data on this lever in the current corpus; section will be expanded when relevant evidence is ingested.

Testing and QC levers

Given the consistency of Cd values in the TDS data FY2018-FY2020 TDS Elements Analytical Results (18 to 37 ppb range across the US market), routine lot-level Cd testing of white bread specifically is a lower priority than testing for higher-risk wheat products such as whole-wheat bread or bran supplements. Testing incoming flour for Cd at supplier qualification is more efficient than testing finished bread.

Packaging and storage levers

No quantified data on this lever in the current corpus; section will be expanded when relevant evidence is ingested.

Regulatory limits that apply

The European Union sets a maximum level for Cd in cereal products of 0.10 mg/kg (100 ppb) under Commission Regulation (EU) 2023/915 cadmium maximum levels and EU Regulation 2023/915 maximum levels for contaminants in food, applicable to white bread as a wheat-based food product. For Pb in cereals, the EU ML is 0.20 mg/kg (200 ppb). The observed Cd values in the TDS data (maximum 37 ppb) are well below the EU ML of 100 ppb. Codex Alimentarius — Maximum Levels for Cadmium in Food provides the international Codex Cd ML for cereal-based products. In the US, FDA Closer to Zero — Program Overview Pb guidance (20 ppb) applies to grain-based baby foods; white bread as an adult or general-population product has no specific FDA Pb or Cd action level.

References

Works cited in this page’s text, in first-appearance order. This is not the full corpus for this page; it is only what the prose above draws on. The complete set of sources is listed under Sources below. Each title links to its source record, which carries the ingest receipt, the extracted values, and the file hash of the document it was built from.

1. Survey of metals in commercial infant foods, infant formula and non-infant specific foodsFood Standards Agency / Fera Science Ltd · UK Food Standards Agency report FS102048 · 2016 · www.food.gov.ukGovernment
2. FY2018-FY2020 TDS Elements Analytical ResultsU.S. Food and Drug Administration · FDA Total Diet Study · 2022 · www.fda.govDataset
3. Total Diet Study of metals and other elements in foodBaxter M and Brereton N · Food and Environment Research Agency report for the UK Food Standards Agency, Fera report 15/06, project FS102081 · 2015 · www.food.gov.ukGovernment
4. Report on a Total Diet Study Carried out by the Food Safety Authority of Ireland in the Period 2012–2014Food Safety Authority of Ireland (FSAI) · FSAI Chemical Monitoring and Surveillance Series · 2016 · www.fsai.ieGovernment

Sources

Auto-generated from source-page frontmatter. The "Used on this page for" column is populated by the orchestrator's POPULATE-SOURCE-LEGEND action; pending entries appear as *[awaiting synthesis]*.

Update history

The five most recent substantive edits to this page, classified major (evidence or structure moved), correction (a published value or statement was wrong and has been fixed), or minor (narrative rewritten without changing the underlying evidence). Each description is derived from what the edit did to this page; the linked commit is the authoritative record, routine regeneration passes are excluded, and the full version history lives in git. When DOI minting comes online (see schema docs), each entry below will also link to a version-pinned DataCite DOI.