Evidence map›Paper›PMID 19696186›Full record

ArticleDiabetes2009

Brown adipose tissue and seasonal variation in humans.

Iain T H Au-Yong, Natasha Thorn, Rakesh Ganatra, Alan C Perkins, Michael E Symonds

Open access · bronzeAbstract read
In one paragraph

Article in Diabetes, 2009. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 114 papers.

0numbers the graph read from it
0cells of the map it votes in
114citing papers in PubMed
10.0field-weighted citation impact, top 1% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

114 citing papers in PubMed, 271 citations in OpenAlex.

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  12. Brown fat thermogenesis and cold adaptation in humans.Journal of physiological anthropology · 2025
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  16. Brown adipose tissue metabolism in women is dependent on ovarian status.American journal of physiology. Endocrinology and metabolism · 2024
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54 more citing papers are in PubMed but not listed here.

4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

5 authors at 3 institutions in 1 country.

Iain T H Au-YongDepartments of Radiology and Nuclear Medicine, Queens Medical Centre, University Hospitals, Nottingham, U.K.
Natasha Thorn
Rakesh Ganatra
Alan C Perkins
Michael E Symonds
Nottingham University Hospitals NHS Trust · GBQueen's Medical Centre · GBNIHR Nottingham Digestive Diseases Biomedical Research Unit · GB

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

objectiveBrown adipose tissue (BAT) is present in adult humans where it may be important in the prevention of obesity, although the main factors regulating its abundance are not well established. BAT demonstrates seasonal variation relating to ambient temperature and photoperiod in mammals. The objective of our study was therefore to determine whether seasonal variation in BAT activity in humans was more closely related to the prevailing photoperiod or temperature. RESEARCH DESIGN AND

methodsWe studied 3,614 consecutive patients who underwent positron emission tomography followed by computed tomography scans. The presence and location of BAT depots were documented and correlated with monthly changes in photoperiod and ambient temperature.

resultsBAT activity was demonstrated in 167 (4.6%) scans. BAT was demonstrated in 52/724 scans (7.2%) in winter compared with 27/1,067 (2.5%) in summer months (P < 0.00001, chi(2) test). Monthly changes in the occurrence of BAT were more closely related to differences in photoperiod (r(2) = 0.876) rather than ambient temperature (r(2) = 0.696). Individuals with serial scans also demonstrated strong seasonal variation in BAT activity (average standardized uptake value [SUV(max)] 1.5 in July and 9.4 in January). BAT was also more common in female patients (female: n = 107, 7.2%; male: n = 60, 2.8%; P < 0.00001, chi(2) test).

conclusionsOur study demonstrates a very strong seasonal variation in the presence of BAT. This effect is more closely associated with photoperiod than ambient temperature, suggesting a previously undescribed mechanism for mediating BAT function in humans that could now potentially be recruited for the prevention or reversal of obesity.

Indexed as

SeasonsAdipose Tissue, BrownAdolescentAdultAgedAged, 80 and overFemaleHumansMaleMiddle AgedObesityPositron-Emission TomographyTemperatureTomography, X-Ray ComputedUnited KingdomYoung Adult

Identifiers

PMID19696186
PMCPMC2768171
OpenAlexW2110645284

What OpenQuestion holds

Textmetadata
LicenceCC BY-NC-ND
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.