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Fat content of UK chickens
Modern organic and broiler chickens sold for human consumption provide more energy from fat than protein.
Overview
Wang Y et al.. Public Health Nutr 2010 · PMID 19728900 · DOI 10.1017/S1368980009991157
Whole chickens with skin had more energy from fat than protein; skinless breast was lean, and organic chickens were similar.
Does the study support the specific claim? Partly · Methodological quality: low
Plain-language summary
Study explained simply
- What did the researchers want to find out?
What is the fat content of chickens sold to the public?
- How was the study done?
Descriptive analysis of fat content and fatty-acid composition of chickens sold in England
- How many people, animals or samples were studied?
Total number not reported; groups of 1-12 samples; UK supermarket, farm, media- and football-club-supplied chickens
- What was actually found?
Whole birds with skin: fat-to-protein energy ratio 3.1 (conventional) and 2.1 (organic); skinless breast fillets low in fat; n-6:n-3 ratio up to about 9-10:1 in both organic and conventional samples.
- How large was the observed effect?
Descriptive
- What do the results mean in everyday life?
Removing skin reduces fat.
- What are the study's limitations?
Unknown total sample size, tiny groups, opportunistic sourcing, no statistics, historical data from different methods.
- What does it say about Elawady's specific claim?
Weak support.
- Do the results apply to Germany and Europe?
Low.
- What can explicitly not be concluded from this study?
Cannot represent all chicken, cannot attribute fat to industrial production (organic was similar), and says nothing about health effects; does not apply to skinless breast meat.
Scientific in-depth review
1. Full reference
- Authors
- Wang Y, Lehane C, Ghebremeskel K, Crawford MA
- Journal
- Public Health Nutr
- Year
- 2010
- Identifier
- PMID 19728900 DOI 10.1017/S1368980009991157
- Verification
- verified – PubMed E-utilities efetch, 2026-10-25
- Retracted
- no
- Corrections
- none
- Extent checked
- full text
- Conflicts of interest and funding
No specific grant from any funding agency; authors declare no conflicts of interest. Study prompted by discussions with Elm Farm Research (organic research organisation) and media; some samples supplied by TV programmes and a football club.
2. Research question
What is the fat content of chickens sold to the public?
3. Study design and population
- Study design
- Other – Descriptive compositional snapshot (fat, TAG/phospholipid and fatty-acid analysis) of chicken products, compared with historical food-composition data from 1870-2002; no formal statistical comparison
- Population
Whole chickens and cuts (skinless breast fillets, breast with skin, legs with skin, whole birds with skin) from organic farms and supermarkets ('farmed' = conventional); one wild pheasant as reference
- Country
UK (England, south-east to mid-west)
- Period
Samples purchased 2004-2008; historical comparison data 1870-2006
- Sample size
Total number of samples not stated; subgroups in tables range from n=1 to n=12 (e.g. farmed skinless breast n=6 in total from 2 supermarkets; organic whole birds n=12 per source). Some samples supplied by TV programmes (Channel 4 Dispatches, ITV Tonight, Hugh Fearnley-Whittingstall) and Chelsea Football Club.
- Inclusion and exclusion criteria
Convenience/opportunistic purchases described as 'random'; authors explicitly did not assess breed, location, feed or production system and call the data 'only a snapshot'.
4. Methods and endpoints
- Exposure / intervention
Contemporary (2004-2008) conventional ('farmed') and organic chicken
- Comparator
Historical compositional data (Letheby 1870, USDA 1896, McCance & Widdowson 1940-2002, FAO 1953, the authors' own 1970s analyses) and a wild pheasant
- Endpoints
Fat and protein (g/100 g and energy), TAG:phospholipid ratio, fatty-acid profile (LA, ALA, AA, EPA, DPA, DHA), n-6:n-3 ratio
- Statistical methods
Descriptive means (SD where n>5); no inferential statistics; historical data from different methods compared directly
5. Actual results
- Results
Table 1 (whole chicken, energy): 2004 'farmed' fat 22.8 g/100 g vs protein 16.5 g/100 g, fat:protein energy ratio 3.1; 2004 organic 17.1 vs 18.2 g/100 g, ratio 2.1; 2004 FSA 23.2 vs 16.1, ratio 3.2; 1970 IBCHN 8.6 vs 24.3, ratio 0.8. Skinless breast fillets were lean: TAG 1440 mg/100 g (farmed, n=6) and 1730 mg/100 g (organic, n=12), versus 7040 mg/100 g in organic legs with skin and 13,800 mg/100 g in farmed whole bird with skin. n-6:n-3 ratios in TAG roughly 5.4-10.1 across samples (e.g. organic legs from one farm 9.66; organic whole birds 10.0 and 8.84), with organic products 'little better' than conventional. DHA in meat ~16-66 mg/100 g in 2004 samples vs 170 mg/100 g in 1970s data. DPA exceeded DHA in most samples.
- Absolute risks
not applicable (food composition; no health outcomes)
- Authors' conclusion
Chicken husbandry needs review for welfare and nutrition.
6. Strengths
- Established lipid laboratory with long-standing historical comparison data
- Separates storage fat (TAG) from structural phospholipids and reports detailed fatty-acid profiles by cut
7. Weaknesses
- Total sample size not reported; very small subgroups (often n=2-3)
- Opportunistic sourcing including media-supplied samples; no sampling frame
- No inferential statistics; historical comparisons rely on different methods and sometimes unavailable detail ('most of the detail of the 1970 data is no longer available')
- Fat>protein energy applies to whole birds or cuts with skin; skinless breast meat was lean
- Organic chickens showed similar patterns, so findings are not specific to industrial broilers
- Extensive speculative discussion (mental health, obesity) not tested by the data
8. Risk of bias
- Orienting tool
- none (food-composition snapshot; no standard RoB tool applies)
- Type of assessment
- structured assessment based on the full text by a single reviewer (no formal double review)
- Full formal assessment
- no
- Overall risk of bias
- high
- Rationale
Unchanged (high). Single-reviewer structured judgement; a formal assessment would need two independent reviewers.
| Domain | Judgement | Rationale |
|---|---|---|
| Sampling/selection | high | Opportunistic, partly media-supplied samples; total n not reported; tiny subgroups. |
| Measurement | low | Standard lipid extraction (Bligh-Dyer/Folch), GLC/GC-MS with internal standard. |
| Comparability with historical data | high | Historical values from different methods, sources and cuts; original detail partly unavailable. |
| Analysis/reporting | high | No inferential statistics; selective emphasis on whole bird with skin in headline. |
Full-text review (25 October 2026): Added sampling description (media/football-club supplied, n not reported, subgroups n=1-12), Table 1 values (fat:protein energy 3.1 farmed, 2.1 organic), skinless breast lean, organic similar to conventional, n-6:n-3 ranges, no funding/COI; archive derivation refined. Bias unchanged (high).
9. Assessment of the statistical interpretation
Purely descriptive; no uncertainty estimates for most values and no tests. Differences over time cannot be separated from changes in breed, cut, analytical method and sampling.
10. Relevance to the specific claim
11. Independent contrary findings
Cut-dependent; skinless breast is lean.
12. Transferability to Germany and Europe
Low to moderate: UK 2004-2008 data only; breeds and feeds broadly similar across EU but not quantified.
13. Overall methodological judgement
Weak, descriptive snapshot. It does document that whole UK chickens with skin (organic and conventional) contained more fat energy than protein energy and had n-6:n-3 ratios up to about 9-10:1, but skinless breast was lean and organic birds were similar, so it does not establish a property of 'industrial broilers' per se or any health effect.
| Multidimensional assessment | |
|---|---|
| Authenticity of the source | verified |
| Methodological quality | low |
| Risk of bias | high |
| Precision of results | low |
| Directness | indirect |
| Reproducibility | not replicated |
| Consistency with the overall evidence | unknown |
| Regional transferability | low |
| Adequacy of the interpretation (by the archive) | partly correct but over-interpreted |
14. Open questions
Representative, statistically sampled composition data by cut and production system; current EU and Egyptian chicken composition.
15. Linked fact checks
Use by the Tayebat archive
Note: according to the archive, the studies were compiled by the archive operators. Whether Dr. Elawady himself cited this study is not established.
- What the archive says about the study
Modern broiler chicken now provides more energy from fat than from protein, with omega-6:omega-3 ratio reaching 9:1.
- A. What was actually studied?
Fat in UK chickens.
- B. What did the authors find?
Whole chickens with skin: fat energy 2-3 times protein energy (farmed 3.1, organic 2.1); n-6:n-3 up to about 9-10:1; skinless breast fillets lean (TAG ~1.4-1.7 g/100 g); organic similar to conventional.
- C. What conclusions do the authors themselves draw?
Husbandry should be reviewed.
- D. What does the archive derive from it?
Arabic narrative says "ثبت" (proven).
- E. Is this derivation scientifically justified?
Partly overinterpreted: a small, opportunistic descriptive snapshot is presented as proof; the fat>protein result refers to whole birds/cuts with skin, not lean breast meat, and organic chickens showed the same pattern, so it is not specific to 'industrial' broilers.
- Adequacy of the interpretation (by the archive)
- partly correct but over-interpreted