metilmercurio en los peces
Cita:
Iniciado por Kalkoven
(...) hay estudios que indican que el contenido de metilmercurio del pescado contrarresta los efectos beneficiosos sobre el riesgo cardiovascular del DHA y demás omega 3. Un estudio de este año:
Data supporting the inverse correlation of fish or long-chain omega-3 fatty acid (FA) (eicosapentaenoic acid plus docosahexaenoic acid) supplement consumption and coronary heart disease are inconclusive and may be confounded by other dietary and lifestyle factors. Using the Diabetic Control and Complications Trial (DCCT) database (n = 1,441), correlations between consumption of omega-3 FAs and saturated FAs to dietary variables (kilocalories, macronutrients, sodium, and cholesterol) and to age, gender, exercise level, and tobacco use were tested using Pearson correlation coefficients. Long-chain omega-3 FA intake inversely correlated with consumption of calories (r = -0.16, p <0.0001), percent calories from total fat (r = -0.14, p <0.0001), and percent calories from saturated FAs (r = -0.21, p <0.0001) and directly with dietary fiber intake (grams per 1,000 kcal, r = 0.20, p <0.0001). In the DCCT database, long-chain omega-3 FAs (i.e., fish consumption) inversely correlated with an overall low risk nutritional profile for coronary heart disease. In conclusion, these findings provide evidence that associations observed in studies suggesting a benefit of fish or long-chain omega-3 FAs may be due to a convergence of greater fish intakes with an overall healthier dietary pattern rather than with a specific effect of long-chain omega-3 FAs.
http://www.ncbi.nlm.nih.gov/sites/entrez
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Cuando el metilmercurio pasa también al ganado
Cita:
Studies of fish consumption as source of methylmercury should consider fish-meal-fed farmed fish and other animal foods. (2009)
Dórea JG.
Faculty of Health Sciences, Universidade de Brasilia, C.P. 04322, 70919-970 Brasilia, DF, Brazil.
The co-occurrence of fish MeHg and omega-3 fatty acids in wild species can indeed be optimized by choosing certain species. Farmed finfish and shellfish that are fed fish-meal, however, can bioconcentrate both MeHg (in muscle) and organohalogen pollutants passed on in the fat components [Dorea, J.G., 2006. Fish meal in animal feed and human exposure to persistent bioaccumulative and toxic substances. J. Food Prot. 69, 2777-2785); when fish-meal is used to feed farm animals it may offer the worst of both worlds: saturated fat (with organohalogen pollutants) and MeHg. It is time to address the dietary sources of Hg derived from animals raised on fish-meal that may contribute to increase tissue Hg concentrations.
PMID: 19027108 [PubMed - indexed for MEDLINE]
http://www.ncbi.nlm.nih.gov/pubmed/1...ubmed_RVDocSum
Traducción de la cursiva:
Cuando la harina de pescado es usada alimentar animales de granja, esto puede ofrecer lo peor de ambos mundos: grasa saturada (con agentes contaminadores organohalogen) y MeHg.
Es el momento de abordar las fuentes de alimentación de Hg procedente de animales criados con harina de pescado que pueden contribuir a aumentar las concentraciones de Hg en los tejidos.