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Dietary heterogeneity among Western industrialized countries reflected in the stable isotope ratios of human hair.

Valenzuela LO, Chesson LA, Bowen GJ, Cerling TE, Ehleringer JR - PLoS ONE (2012)

Bottom Line: Although the globalization of food production is often assumed to result in a homogenization of consumption patterns with a convergence towards a Western style diet, the resources used to make global food products may still be locally produced (glocalization).European hair samples had significantly lower δ(13)C values (-22.7 to -18.3‰), and significantly higher δ(15)N (7.8 to 10.3‰) and δ(34)S (4.8 to 8.3‰) values than samples from the USA (δ(13)C: -21.9 to -15.0‰, δ(15)N: 6.7 to 9.9‰, δ(34)S: -1.2 to 9.9‰).Within Europe, we detected differences in hair δ(13)C and δ(34)S values among countries and covariation of isotope ratios with latitude and longitude.

View Article: PubMed Central - PubMed

Affiliation: Department of Biology, University of Utah, Salt Lake City, Utah, United States of America. valenzuela@biology.utah.edu

ABSTRACT
Although the globalization of food production is often assumed to result in a homogenization of consumption patterns with a convergence towards a Western style diet, the resources used to make global food products may still be locally produced (glocalization). Stable isotope ratios of human hair can quantify the extent to which residents of industrialized nations have converged on a standardized diet or whether there is persistent heterogeneity and glocalization among countries as a result of different dietary patterns and the use of local food products. Here we report isotopic differences among carbon, nitrogen and sulfur isotope ratios of human hair collected in thirteen Western European countries and in the USA. European hair samples had significantly lower δ(13)C values (-22.7 to -18.3‰), and significantly higher δ(15)N (7.8 to 10.3‰) and δ(34)S (4.8 to 8.3‰) values than samples from the USA (δ(13)C: -21.9 to -15.0‰, δ(15)N: 6.7 to 9.9‰, δ(34)S: -1.2 to 9.9‰). Within Europe, we detected differences in hair δ(13)C and δ(34)S values among countries and covariation of isotope ratios with latitude and longitude. This geographic structuring of isotopic data suggests heterogeneity in the food resources used by citizens of industrialized nations and supports the presence of different dietary patterns within Western Europe despite globalization trends. Here we showed the potential of stable isotope analysis as a population-wide tool for dietary screening, particularly as a complement of dietary surveys, that can provide additional information on assimilated macronutrients and independent verification of data obtained by those self-reporting instruments.

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Covariation of δ13C values of human hair with A) latitude and B) longitude for samples collected in Europe.Open circles are individual hair samples and filled circles represent country averages (see Table 1). Solid lines represent the standard deviations of δ13C values by country. Horizontal dashed lines represent the latitudinal (A) or longitudinal (B) ranges covered during sample collection per country. Location means were estimated as the average latitude (A) or longitude (B) for collected samples per country. Partial correlations were significant (rCLat.Long = −0.56 (A), rCLong.Lat = −0.27 (B), p<0.001).
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pone-0034234-g003: Covariation of δ13C values of human hair with A) latitude and B) longitude for samples collected in Europe.Open circles are individual hair samples and filled circles represent country averages (see Table 1). Solid lines represent the standard deviations of δ13C values by country. Horizontal dashed lines represent the latitudinal (A) or longitudinal (B) ranges covered during sample collection per country. Location means were estimated as the average latitude (A) or longitude (B) for collected samples per country. Partial correlations were significant (rCLat.Long = −0.56 (A), rCLong.Lat = −0.27 (B), p<0.001).

Mentions: Within Western Europe, the δ13C values of human hair were negatively correlated with latitude (partial correlation rCLat.Long = −0.56, p<0.001, n = 126; Figure 3A) and longitude (rCLong.Lat = −0.27, p<0.01, n = 126; Figure 3B). No significant correlations were detected between the δ15N values and latitude (rNLat.Long = −0.02, p = 0.82, n = 129) or longitude (rNLong.Lat = −0.10, p = 0.26, n = 129). Sulfur isotope values were not correlated with latitude (rSLat.Long = −0.22, p = 0.26, n = 26) but were negatively correlated with longitude (rSLong.Lat = −0.40, p = 0.03, n = 26; Figure 4). However, this latter correlation is driven by the lower hair values of Finland (Figure 4); if this country is excluded from the analysis the correlation is not significant (rSLong.Lat = −0.31, p = 0.15, n = 21).


Dietary heterogeneity among Western industrialized countries reflected in the stable isotope ratios of human hair.

Valenzuela LO, Chesson LA, Bowen GJ, Cerling TE, Ehleringer JR - PLoS ONE (2012)

Covariation of δ13C values of human hair with A) latitude and B) longitude for samples collected in Europe.Open circles are individual hair samples and filled circles represent country averages (see Table 1). Solid lines represent the standard deviations of δ13C values by country. Horizontal dashed lines represent the latitudinal (A) or longitudinal (B) ranges covered during sample collection per country. Location means were estimated as the average latitude (A) or longitude (B) for collected samples per country. Partial correlations were significant (rCLat.Long = −0.56 (A), rCLong.Lat = −0.27 (B), p<0.001).
© Copyright Policy
Related In: Results  -  Collection

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getmorefigures.php?uid=PMC3316624&req=5

pone-0034234-g003: Covariation of δ13C values of human hair with A) latitude and B) longitude for samples collected in Europe.Open circles are individual hair samples and filled circles represent country averages (see Table 1). Solid lines represent the standard deviations of δ13C values by country. Horizontal dashed lines represent the latitudinal (A) or longitudinal (B) ranges covered during sample collection per country. Location means were estimated as the average latitude (A) or longitude (B) for collected samples per country. Partial correlations were significant (rCLat.Long = −0.56 (A), rCLong.Lat = −0.27 (B), p<0.001).
Mentions: Within Western Europe, the δ13C values of human hair were negatively correlated with latitude (partial correlation rCLat.Long = −0.56, p<0.001, n = 126; Figure 3A) and longitude (rCLong.Lat = −0.27, p<0.01, n = 126; Figure 3B). No significant correlations were detected between the δ15N values and latitude (rNLat.Long = −0.02, p = 0.82, n = 129) or longitude (rNLong.Lat = −0.10, p = 0.26, n = 129). Sulfur isotope values were not correlated with latitude (rSLat.Long = −0.22, p = 0.26, n = 26) but were negatively correlated with longitude (rSLong.Lat = −0.40, p = 0.03, n = 26; Figure 4). However, this latter correlation is driven by the lower hair values of Finland (Figure 4); if this country is excluded from the analysis the correlation is not significant (rSLong.Lat = −0.31, p = 0.15, n = 21).

Bottom Line: Although the globalization of food production is often assumed to result in a homogenization of consumption patterns with a convergence towards a Western style diet, the resources used to make global food products may still be locally produced (glocalization).European hair samples had significantly lower δ(13)C values (-22.7 to -18.3‰), and significantly higher δ(15)N (7.8 to 10.3‰) and δ(34)S (4.8 to 8.3‰) values than samples from the USA (δ(13)C: -21.9 to -15.0‰, δ(15)N: 6.7 to 9.9‰, δ(34)S: -1.2 to 9.9‰).Within Europe, we detected differences in hair δ(13)C and δ(34)S values among countries and covariation of isotope ratios with latitude and longitude.

View Article: PubMed Central - PubMed

Affiliation: Department of Biology, University of Utah, Salt Lake City, Utah, United States of America. valenzuela@biology.utah.edu

ABSTRACT
Although the globalization of food production is often assumed to result in a homogenization of consumption patterns with a convergence towards a Western style diet, the resources used to make global food products may still be locally produced (glocalization). Stable isotope ratios of human hair can quantify the extent to which residents of industrialized nations have converged on a standardized diet or whether there is persistent heterogeneity and glocalization among countries as a result of different dietary patterns and the use of local food products. Here we report isotopic differences among carbon, nitrogen and sulfur isotope ratios of human hair collected in thirteen Western European countries and in the USA. European hair samples had significantly lower δ(13)C values (-22.7 to -18.3‰), and significantly higher δ(15)N (7.8 to 10.3‰) and δ(34)S (4.8 to 8.3‰) values than samples from the USA (δ(13)C: -21.9 to -15.0‰, δ(15)N: 6.7 to 9.9‰, δ(34)S: -1.2 to 9.9‰). Within Europe, we detected differences in hair δ(13)C and δ(34)S values among countries and covariation of isotope ratios with latitude and longitude. This geographic structuring of isotopic data suggests heterogeneity in the food resources used by citizens of industrialized nations and supports the presence of different dietary patterns within Western Europe despite globalization trends. Here we showed the potential of stable isotope analysis as a population-wide tool for dietary screening, particularly as a complement of dietary surveys, that can provide additional information on assimilated macronutrients and independent verification of data obtained by those self-reporting instruments.

Show MeSH