In 1994, French researchers recruited 4,500 French men and women aged 45 to 60 to take part in the experiment. Half of them took a daily supplement with vitamins C and E, selenium, zinc and beta-carotene for eight years, the other half took a placebo. The participants were not told whether they were taking the vitamin or the placebo.
After the eight years, researchers stopped giving participants the pills and gave them the choice of whether or not to take vitamin supplements. Six years later, the researchers brought them back for a round of memory tests, including word and number problems.
While the supplement and placebo groups performed similarly on most tests, the nutrient-boosted participants beat their peers on one test of long-term memory in which participants had to recall words in different categories.
The findings support a beneficial effect of a well-balanced intake of antioxidant nutrients at nutritional doses for maintaining cognitive performance, especially verbal memory.
Take a look at the study here.
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