유제품과 심근경색증

최근 하버드 공공영양부서의 연구결과 발표입니다.

사료를 먹는 소와 달리 자연의 풀을 먹고 자라는 소의 유제품은 포화지방으로 인해 생기는 심근경색증과 같은 질병과는 무관하다는 것을 연구결과로 발표했습니다.

자연의 풀을 먹고 나오는 우유는 곡식이나 사료를 먹는 소의 우유보다 더 많은 CLA(복합리놀산)을 포함하고 있으며, 복합리놀산은 당뇨나 암의 예방에도 효과가 있다고 합니다.

자연속에는 우리가 생각하는 것 이상으로 좋은 것들이 있지만 자연을 거스러는 것 속에는 우리가 생각하는 것 이상으로 나쁜 것들이 있다는 믿음에 더욱 확신을 주는 연구결과입니다.

모든 음식은 득과 실이 있지만,
특히 어떤 환경에서 길러졌으며 어떤 과정을 거쳐 생산되었는가에 따라 더욱 큰 득과 실이 있을 것입니다.

요약 원문입니다.

Conjugated linoleic acid in adipose tissue and risk of myocardial infarction1,2,3
Liesbeth A Smit, Ana Baylin and Hannia Campos
1 From the Department of Nutrition Harvard School of Public Health Boston MA (LASHC); the Department of Epidemiology University of Michigan School of Public Health Ann Arbor MI (AB);the Centro Centroamericano de Población Universidad de Costa Rica San Pedro Costa Rica (HC).
2 Supported by grants HL49086 and HL60692 from the National Institutes of Health.
3 Address correspondence to H Campos, Department of Nutrition, Room 201, Building 1, Harvard School of Public Health, 665 Huntington Avenue, Boston, MA 02115. E-mail hcampos@hsph.harvard.edu.

ABSTRACT
Background: Despite the high saturated fat content of dairy products, no clear association between dairy product intake and risk of myocardial infarction (MI) has been observed. Dairy products are the main source of conjugated linoleic acid (CLA; 18:2n–7t), which is produced by the ruminal biohydrogenation of grasses eaten by cows. Pasture-grazing dairy cows have more CLA in their milk than do grain-fed cows. Some animal models have reported beneficial effects of CLA on atherosclerosis.
Objective: The objective was to determine the association between the 9c,11t-CLA isomer in adipose tissue and risk of MI.
Design: The studied population consisted of 1813 incident cases of a first nonfatal acute MI and 1813 population-based controls matched for age, sex, and area of residence. All subjects lived in Costa Rica—a country that uses traditional pasture-grazing for dairy cows. Conditional logistic regression was used to estimate multivariate odds ratios and 95% CIs.
Results: Adipose tissue 9c,11t-CLA was associated with a lower risk of MI in basic and multivariate models. Compared with the lowest quintile, odds ratios and 95% CIs were 0.80 (0.61, 1.04) for the second, 0.86 (0.64, 1.14) for the third, 0.62 (0.46, 0.84) for the fourth, and 0.51 (0.36, 0.71) for the fifth quintiles (P for trend <0.0001). Dairy intake was not associated with risk of MI, despite a strong risk associated with saturated fat intake.
Conclusion: 9c,11t-CLA, which is present in meaningful amounts in the milk of pasture-grazed cows, might offset the adverse effect of the saturated fat content of dairy products.
Received for publication March 16, 2010. Accepted for publication April 2, 2010.