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Groenten, fruit en granen tegen beroerte*
Uit een grote Zweedse studie onder ruim 36.000 vrouwen in de leeftijd van 49 tot 83 jaar die tot 12 jaar lang gevolgd werden blijkt dat voeding rijk aan groenten, fruit en granen de kans op een beroerte sterk kan doen dalen. Deze voeding is rijk aan antioxidanten die zorgen voor een goede antioxidant capaciteit (TAC) van het lichaam. De helft van de TAC wordt gehaald uit groenten en fruit, 18% uit granen, 16% uit thee en 5% uit chocolade. Tijdens de studie kregen ruim 4% van de vrouwen zonder een geschiedenis van hart- of vaatziekte een beroerte, bij de vrouwen met wel een geschiedenis van hart- of vaatziekte was dat ruim 17%. “Gezonde” vrouwen met de hoogste TAC-waarden hadden 17% minder kans op een beroerte dan zij met de laagste TAC-waarden. Bij vrouwen met een geschiedenis van hart- en vaatziekte bleken zij met de hoogste TAC-waarden wel 46-57% minder kans te hebben op een beroerte.
Vegetables, Fruits, Grains Reduce Stroke Risk in Women
Swedish women who ate an antioxidant-rich diet had fewer strokes regardless of whether they had a previous history of cardiovascular disease, in a study reported in Stroke: Journal of the American Heart Association.
"Eating antioxidant-rich foods may reduce your risk of stroke by inhibiting oxidative stress and inflammation," said Susanne Rautiainen, M.Sc., the study's first author and Ph.D. student at the Karolinska Institutet in Sweden. "This means people should eat more foods such as fruits and vegetables that contribute to total antioxidant capacity."
Oxidative stress is an imbalance between the production of cell-damaging free radicals and the body's ability to neutralize them. It leads to inflammation, blood vessel damage and stiffening.
Antioxidants such as vitamins C and E, carotenoids and flavonoids can inhibit oxidative stress and inflammation by scavenging the free radicals. Antioxidants, especially flavonoids, may also help improve endothelial function and reduce blood clotting, blood pressure and inflammation.
"In this study, we took into account all the antioxidants present in the diet, including thousands of compounds, in doses obtained from a usual diet," Rautiainen said.
Researchers collected dietary data through a food-frequency questionnaire. They used a standard database to determine participants' total antioxidant capacity (TAC), which measures the free radical reducing capacity of all antioxidants in the diet and considers synergistic effects between substances.
Researchers categorized the women according to their TAC levels -- five groups without a history of cardiovascular disease and four with previous cardiovascular disease.
For women with no history of cardiovascular disease who had the highest TAC, fruits and vegetables contributed about 50 percent of TAC.
Other contributors were whole grains (18 percent), tea (16 percent) and chocolate (5 percent).
The study found:
· Higher TAC was related to lower stroke rates in women without cardiovascular disease.
· Women without cardiovascular disease with the highest levels of dietary TAC had a statistically significant 17 percent lower risk of total stroke compared to those in the lowest quintile.
· Women with history of cardiovascular disease in the highest three quartiles of dietary TAC had a statistically significant 46 percent to 57 percent lower risk of hemorrhagic stroke compared with those in the lowest quartile.
"Women with a high antioxidant intake may be more health conscious and have the sort of healthy behaviors that may have influenced our results," Rautiainen said. "However, the observed inverse association between dietary TAC and stroke persisted after adjustments for potential confounders related to healthy behavior such as smoking, physical activity and education."
For the study, researchers used the Swedish Mammography Cohort to identify 31,035 heart disease-free women and 5,680 women with a history of heart disease in two counties. The women were 49-83 years old.
Researchers tracked the cardiovascular disease-free women an average 11.5 years and the women with cardiovascular disease 9.6 years, from September 1997 through the date of first stroke, death or Dec. 31, 2009, whichever came first.
Researchers identified 1,322 strokes among cardiovascular disease-free women and 1,007 strokes among women with a history of cardiovascular disease from the Swedish Hospital Discharge Registry.
"To the best of our knowledge, no study has assessed the relation between dietary TAC and stroke risk in participants with a previous history of cardiovascular disease," Rautiainen said. "Further studies are needed to assess the link between dietary TAC and stroke risk in men and in people in other countries, but we think our results are applicable."
Co-authors are Susanna Larsson, Ph.D.; Jarmo Virtamo, M.D.; and Alicja Wolk, Dr.Med.Sci. Authors' disclosures are on the manuscript.
The Swedish Research Council for Infrastructure and the Swedish Council for Working Life and Social Research funded the study. (December 2011)