Half of the rice sold in the UK breaches limits on arsenic for children
More than half of rice varieties sold in the UK contained levels of arsenic higher than regulations allow for babies and children under five. Scientists call for labelling to warn of particular risk to infants and young children.
Arsenic, which is classified as a Group 1 carcinogen by the International Agency for Research on Cancer, is water-soluble - so it accumulates in rice, which is grown in flooded fields more than other cereals. Arsenic exposure affects almost every organ in the body and can cause skin lesions, cancer, diabetes and lung diseases.
Up to 90 per cent of UK households buy rice, with the average person consuming around 100 g per week. Rice and rice-based products are widely used for weaning and as baby food, due to their nutritional benefits and relatively low allergic potential – but, according to the European Food Safety Authority, children are two-three times more susceptible to arsenic risks than adults due to their lower body weight.
The new study:
In a study published in the journal Ecotoxicology and Environmental Safety (open access), a team at the University of Sheffield’s Institute for Sustainable Food found 28 out of 55 rice samples sold in the UK contained levels of arsenic that exceeded European Commission regulations for rice meant for the consumption for infants or young children. The research is the first to measure differences in human health risks from arsenic using a substantial number of rice varieties marketed in the UK.
The results showed that brown rice contained higher levels of the carcinogen than white or wild rice because it contains the bran – the outer layer of the grain. Meanwhile, organically grown rice was found to contain significantly higher levels than non-organically grown rice. White rice contained the lowest levels of arsenic.
Considering the health implications, the researchers concluded that babies under the age of one must be restricted to a maximum of 20g per day of the 28 rice varieties that breached regulations, in order to avoid risks of developing cancer in later life. They have recommended that the UK government and European Commission introduce labelling to clarify whether rice is safe for consumption by babies and children under five.
"Brown and wild rice are healthy foods full of fibre and vitamins, and there is no need for grown-ups to avoid them – but it is concerning to see so many varieties sold in the UK breaching food safety regulations.
Rice products are often considered a safe option for babies and young children, but our research suggests that for more than half of the rice we sampled, infants should be limited to just 20 g per day to avoid risks associated with arsenic. The government and the European Commission must introduce labelling to warn people of arsenic levels in rice to enable families to make informed food choices" commented Dr Manoj Menon, Environmental Soil Scientist in the Department of Geography at the University of Sheffield and lead author of the study.
Manoj Menon, Binoy Sarkar, Joseph Hufton, Christian Reynolds, Saul Vazquez Reina, Scott Young, Do arsenic levels in rice pose a health risk to the UK population?, Ecotoxicol. Environ. Safety, 197 (2020) 110601. DOI: 10.1016/j.ecoenv.2020.110601
M. Carey, C. Meharg, P. Williams, E. Marwa, X. Jiujin, J.G. Farias,
P.M.C.S. De Silva, A. Signes-Pastor, Y. Lu, F.T. Nicoloso, L. Savage, K.
Campbell, C. Elliott, E. Adomako, A.J. Green, E. Moreno-Jiménez, A.A.
Carbonell-Barrachina, E.A. Triwardhani, F.I. Pandiangan, P.I. Haris,
Y.F. Lawgali, A. Sommella, M. Pigna, C. Brabet, D. Montet, K. Njira,
M.J. Watts, A.A. Meharg, Global sourcing of low-inorganic arsenic rice
grain. Expo. Health, (2020) 1–9. DOI: 10.1007/s12403-019-00330-y.
K.N. Jallad, The hazards of a ubiquitary metalloid, arsenic, hiding in
infant diets: detection,. Speciation, Exposure, and Risk Assessment.
Biol. Trace Elem. Res., 190 (2019) 11–23. DOI:
N. Liao, E. Seto, B. Eskenazi, M. Wang, Y. Li, J. Hua, A comprehensive
review of arsenic exposure and risk from rice and a risk assessment
among a cohort of adolescents in Kunming, China. Int. J. Environ. Res.
Publ. Health, 15/10 (2018) 1–17. DOI: 10.3390/ijerph15102191
Guillod-Magnin, B.J. Brüschweiler, R. Aubert, M. Haldimann, Arsenic
species in rice and rice-based products consumed by toddlers in
Switzerland. Food Addit. Contam. Part A, 35/6 (2018) 1164-1178. DOI:
Hong-Bo Li, Jie Li, Di Zhao, Chao Li, Xue-Jiao Wang, Hong-Jie Sun, Albert L. Juhasz, Lena Q. Ma, Arsenic Relative Bioavailability in Rice Using a Mouse Arsenic Urinary Excretion Bioassay and Its Application to Assess Human Health Risk, Environ. Sci. Technol., 51/8 (2017) 4689−4696. DOI: 10.1021/acs.est.7b00495
S. Islam, M.M. Rahman, M.R. Islam, R. Naidu, Arsenic accumulation in
rice: consequences of rice genotypes and management practices to reduce
human health risk. Environ. Int., 96 (2016) 139–155. DOI:
Signes-Pastor, M. Carey, A.A. Meharg, Inorganic arsenic in rice-based
products for infants and young children. Food Chem., 191 (2016) 128–134.
A.J. Signes-Pastor, M. Carey, A.A. Carbonell-Barrachina, E.
Moreno-Jiménez, A.J. Green, A.A. Meharg, Geographical variation in
inorganic arsenic in paddy field samples and commercial rice from the
Iberian Peninsula. Food Chem., 202 (2016) 356–363. DOI: 10.1016/j.foodchem.2016.01.117.
F.R. Segura, J.M. de Oliveira Souza, E.S. De Paula, A. da Cunha Martins,
A.C.C. Paulelli, F. Barbosa, B.L. Batista, Arsenic speciation in
Brazilian rice grains organically and traditionally cultivated: is there
any difference in arsenic content? Food Res. Int., 89/1 (2016) 169-176. DOI: 10.1016/j.foodres.2016.07.011.
R. Ma, J. Shen, J. Wu, Z. Tang, Q. Shen, F.-J. Zhao, Impact of agronomic
practices on arsenic accumulation and speciation in rice grain.
Environ. Pollut., 194 (2014) 217–223. DOI: 10.1016/J.ENVPOL.2014.08.004.
Munera-Picazo, F. Burló, A.A. Carbonell-Barrachina, Arsenic speciation
in ricebased food for adults with celiac disease. Food Addit. Contam.
Part A, 31/8 (2014) 1358-1366. DOI: 10.1080/19440049.2014.933491.
M.A. Rahman, M.M. Rahman, S.M. Reichman, R.P. Lim, R. Naidu, Arsenic
speciation in australian-grown and imported rice on sale in Australia:
implications for human health risk. J. Agric. Food Chem., 62/25 (2014)
6016–6024. DOI: 10.1021/jf501077w.
E.M. Rintala, P. Ekholm, P. Koivisto, K. Peltonen, E.R. Venäläinen, The
intake of inorganic arsenic from long grain rice and rice-based baby
food in Finland - low safety margin warrants follow up. Food Chem., 150
(2014) 199–205. DOI: 10.1016/j.foodchem.2013.10.155.
A. Sommella, C. Deacon, G. Norton, M. Pigna, A. Violante, A.A. Meharg,
Total arsenic, inorganic arsenic, and other elements concentrations in
Italian rice grain varies with origin and type. Environ. Pollut., 181 (2013) 38–43. DOI: 10.1016/j.envpol.2013.05.045.
Kurzius-Spencer, M.K. O’Rourke, C.H. Hsu, V. Hartz, R.B. Harris, J.L.
Burgess, Measured versus modeled dietary arsenic and relation to urinary
arsenic excretion and total exposure. J. Expo. Sci. Environ.
Epidemiol., 23 (2013) 442-449. DOI: 10.1038/jes.2012.120
Guo-Xin Sun, Tom Van de Wiele, Pradeep Alava, Filip Tack, Gijs Du Laing, Arsenic in Cooked Rice: Effect of Chemical, Enzymatic and Microbial Processes on Bioaccessibility and Speciation in the Human Gastrointestinal Tract, Environ. Pollut., 162 (2012) 241-6. DOI: 10.1016/j.envpol.2011.11.021.
B.L. Batista, J.M.O. Souza, S.S. De Souza, F. Barbosa, Speciation of arsenic in rice and estimation of daily intake of different arsenic species by Brazilians through rice consumption, J. Hazard Mater., 191 (2011) 342-348. DOI: 10.1016/j.jhazmat.2011.04.087
Diane Gilbert-Diamond, Kathryn L. Cottingham, Joann F. Gruber, Tracy Punshon, Vicki Sayarath, A. Jay Gandolfi, Emily R. Baker, Brian P. Jackson, Carol L. Folt, Margaret R. Karagas, Rice consumption contributes to arsenic exposure in US women, Proc. Nat. Acad. Sci. USA, 108/51 (2011) 20656-660. DOI: 10.1073/pnas.1109127108
J.H. Huang, G. Ilgen, P. Fecher, Quantitative chemical extraction for
arsenic speciation in rice grains. J. Anal. At. Spectrom., 25/6 (2010)
800-802. DOI: 10.1039/c002306j.
A.A. Meharg, P.N. Williams, E. Adomako, Y.Y. Lawgali, C. Deacon, A.
Villada, R.C.J. Cambell, G. Sun, Y.-G. Zhu, J. Feldmann, A. Raab, F.-J.
Zhao, R. Islam, S. Hossain, J. Yanai, Geographical variation in total
and inorganic arsenic content of polished (white) rice. Environ. Sci.
Technol., 43/5 (2009) 1612–1617. DOI: 10.1021/es802612a.
Meharg, E. Lombi, P.N. Williams, K.G. Scheckel, J. Feldmann, A. Raab,
Y. Zhu, R. Islam, Speciation and localization of arsenic in white and
brown rice grains, Environ. Sci. Technol., 42/4 (2008) 1051–1057. DOI:
Zhu, G.X. Sun, M. Lei, M. Teng, Y.X. Liu, N.C. Chen, L.H. Wang, A.M.
Carey, C. Deacon, A. Raab, A.A. Meharg, P.N. Williams, High percentage
inorganic arsenic content of mining impacted and nonimpacted Chinese
rice. Environ. Sci. Technol., 42/13 (2008) 5008-5013. DOI:
S. Torres-Escribano, M. Leal, D. Vélez, R. Montoro, Total and inorganic
arsenic concentrations in rice sold in Spain, effect of cooking, and
risk assessments. Environ. Sci. Technol., 42/10 (2008) 3867–3872. DOI:
Williams, A. Raab, J. Feldmann, A.A. Meharg, Market basket survey shows
elevated levels of as in South Central U.S. processed rice compared to
California: consequences for human dietary exposure. Environ. Sci.
Technol., 41/7 (2007) 2178–2183. DOI: 10.1021/es061489k.
Williams, A.H. Price, A. Raab, S.A. Hossain, J. Feldmann, A.A. Meharg,
Variation in arsenic speciation and concentration in paddy rice related
to dietary exposure. Environ. Sci. Technol., 39/15 (2005) 5531–5540.
Heitkemper, N.P. Vela, K.R. Stewart, C.S. Westphal, Determination of
total and speciated arsenic in rice by ion chromatography and
inductively coupled plasma mass spectrometry. J. Anal. At. Spectrom.,
16/4 (2001) 299–306. DOI: 10.1039/b007241i.
J.P. Bennett, E. Chiriboga, J. Coleman, D.M. Waller, Heavy metals in wild rice from northern. Wisconsin. Sci. Total Environ., 246 (2000) 261–269. DOI: 10.1016/S0048-9697(99)00464-7.