A year of DHA slowed shrinkage of the hippocampus, the brain's memory center, in older adults with mild cognitive impairment. In a 240-person randomized trial from China (219 completers), the DHA group also outperformed placebo on Full-Scale IQ, Information and Digit Span. The dose was a 2 g/day supplement, about 0.9 g of actual DHA. The findings may help explain why omega-3 trials in healthy people have been mixed, since the benefit may be concentrated in those already showing cognitive decline. This article covers the numbers, the likely mechanisms, practical tips on dose and sourcing, and the limits of a single trial.
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