We found that people who ate one fish meal a week had a 10 percent slower annual decline in thinking, ... Those who ate two fish meals a week showed a 13 percent slower annual decline.
Those who ate two fish meals a week showed a 13 per cent slower annual decline.
We found that people who ate fish one or more times a week had 13 percent slower decline in thinking ability over time, ... People who rarely eat fish have a somewhat faster decline in their thinking ability over time.