Micronutrientes antioxidantes e risco cardiovascular em pacientes com diabetes: uma revisão sistemática / Antioxidant micronutrients and cardiovascular risk in patients with diabetes: a systematic review

FUNDAMENTO: Associações inversas entre a ingestão de micronutrientes e desfechos cardiovasculares foram demonstradas previamente na população geral. OBJETIVO: Revisar sistematicamente o papel de micronutrientes no desenvolvimento/presença de desfechos cardiovasculares em pacientes com diabetes. MÉTODOS: Foi realizada uma busca nas bases de dados Medline, Embase e Scopus (Janeiro/1949-Março/2012) por estudos observacionais que avaliaram micronutrientes antioxidantes e desfechos cardiovasculares em pacientes com diabetes e, em seguida, os dados foram selecionados e extraídos (dois revisores independentes). RESULTADOS: Dos 15658 estudos identificados, cinco foram incluídos, sendo três de caso-controle e dois de coorte, com um acompanhamento de 7-15 anos. Uma metanálise não foi realizada devido aos diferentes micronutrientes antioxidantes (tipos e métodos de medição) e os desfechos avaliados. Os micronutrientes avaliados foram: vitamina C (dieta e/ou suplementação), cromo e selênio em amostras de unha, e α-tocoferol e zinco no soro. A ingestão de > 300 mg de vitamina C a partir de uplementos esteve associada a um risco aumentado de doença cardiovascular, doença arterial coronariana (DAC) e acidente vascular cerebral (RR 1,69-2,37). Altos níveis de α-tocoferol no soro foram associados a um risco 30% inferior de DAC em outro estudo (RR 0,71, IC 95% 0,53-0,94). Entre os minerais (zinco, selênio e cromo), foi observada uma associação inversa entre o zinco e a DAC: níveis inferiores a 14,1 μmol/L foram associados a um risco aumentado para DAC (RR 1,70, IC 95% 1,21-2,38). CONCLUSÃO: A informação disponível sobre essa questão é escassa. Estudos prospectivos adicionais são necessários para elucidar o papel desses nutrientes no risco cardiovascular de pacientes com diabetes.

BACKGROUND: Inverse associations between micronutrient intake and cardiovascular outcomes have been previously shown, but did not focus on diabetic patients. OBJECTIVE: To systematically review the role of micronutrients in the development/presence of cardiovascular outcomes in patients with diabetes. METHODS: We searched Medline, Embase, and Scopus (January/1949-March/2012) for observational studies that evaluated micronutrients and cardiovascular outcomes in patients with diabetes, and then selected and extracted the data (two independent reviewers). RESULTS: From the 15 658 studies identified, five were included, comprising three case-control and two cohorts, with a follow-up of 7-15 years. A meta-analysis was not performed due to the different antioxidant micronutrients (types and measurement methods) and outcomes evaluated. The micronutrients assessed were vitamin C intake in diet and/or supplementation, chromium and selenium in toenail samples, and α-tocopherol and zinc in serum levels. Intake of >300 mg of vitamin C through supplementation was associated with increased risk of cardiovascular disease, coronary artery disease (CAD), and stroke (RR 1.69-2.37). High levels of α-tocopherol in serum were associated with 30% lower CAD risk in another study (HR 0.71; 95%CI 0.53-0.94). Among minerals (zinc, selenium, and chromium), an inverse association between zinc and CAD was observed; levels lower than 14.1 µmol/L were associated with an increased risk for CAD (RR 1.70; 95%CI 1.21-2.38). CONCLUSION: The information available on this issue is scarce. Further prospective studies are needed to elucidate the role of these nutrients in the cardiovascular risk of patients with diabetes.

Administración de ácido fólico y otros micronutrientes en mujeres embarazadas de Colombia / Administration of folic acid and other micronutrients to pregnant women in Colombia

OBJETIVO: Caracterizar el consumo de ácido fólico (AF) y otros micronutrientes en forma de medicamentos en un grupo de mujeres gestantes colombianas. MÉTODOS: Estudio observacional descriptivo. Se obtuvo información por medio de entrevistas a gestantes y de sus registros de historia clínica de control prenatal y/o atención del parto en cuatro ciudades de Colombia. La muestra fue de 1 637 mujeres atendidas en 15 instituciones. RESULTADOS: A 1 315 gestantes (80,3%) les recomendaron consumir AF, con prescripción realizada por médico al 84% de ellas; 90,3% adhirieron al tratamiento. A 85,6% el AF les fue suministrado por la empresa aseguradora de salud, y 10,7% lo compró de su bolsillo. La prescripción fue pertinente en 0,2% de las mujeres. Su consumo fue totalmente oportuno en 0,2% y totalmente inoportuno en 41,9% de las gestantes. A 1 192 mujeres (72,8%) les recomendaron otros micronutrientes; a 77,6% de ellas se los recomendó el médico, y 88,7% adhirieron al tratamiento. CONCLUSIONES: Se recomienda y se consume AF y otros micronutrientes de manera inadecuada, sin evaluar las necesidades individuales de las mujeres gestantes. Se invita a reflexionar sobre la utilidad de los programas que promueven el consumo masivo de micronutrientes en forma de medicamento durante el embarazo; los programas parecen desconocer las causas fundamentales de los problemas nutricionales que aquejan a la población.

OBJECTIVE: To characterize the intake of folic acid (FA) and other micronutrients in medicinal form in a group of pregnant women in Colombia. METHODS: Descriptive observational study. Information was obtained from interviews of pregnant women and from the clinical records of their prenatal check-ups and/or delivery in four cities in Colombia. The sample consisted of 1 637 women seen in 15 institutions. RESULTS: A total of 1 315 pregnant women (80.3%) were advised to take FA, and 84% received a prescription, 90.3% of whom adhered to the treatment. FA was provided to 85.6% of them by their health insurance company and 10.7% purchased it themselves. The prescription was appropriate for 0.2% of the women; its use was entirely appropriate for 0.2% of the pregnant women and totally inappropriate for 41.9%. Other micronutrients were recommended to 1 192 women (72.8%), 77.6% of whom received the advice from their physician, with 88.7% adhering to the treatment. CONCLUSIONS: FA and other micronutrients are inappropriately recommended to pregnant women and taken without assessing their individual needs. The usefulness of programs that promote mass consumption of micronutrients in medicinal form during pregnancy should be reexamined. These programs seem not to recognize the fundamental causes of the population's nutritional problems.

A vitamin, mineral, herb dietary supplement effect on blood glucose in uncontrolled type II diabetic subjects

We tested a dietary supplement formulated with a synergistic combination of vitamins, minerals, herbals in a group of 15 patients with uncontrolled diabetes type II. The supplement was given for 30 days. Fasting blood glucose was measured prior to the supplementation and at the end of the 30 days treatment period. Blood glucose was significantly reduced in all patients with no adverse effects. This orthomolecular correction of faulty glucose metabolism with a combination of nontoxic, safe and fairly inexpensive nutraceuticals needs to be further substantiated. Nervertheless the idea of correcting metabolism with micronutrients is a new concept of genetic nutritioneering that seems appealing and cost effective