Tim Lundeen, a Bay Area software developer, previously posted here about what happened when he increased his daily dose of DHA (an omega-3 fat in fish oil) from 400 mg/day to 800 mg/day: The next day, the speed with which he did simple arithmetic (e.g., 7 + 3) increased. At that point he had only four days from the high-DHA condition. Now he has two months. Here it is:
The y axis is the total time taken to do a set of 100 simple arithmetic problems.
Bottom line: The improvement continued, at roughly the same level. Very good evidence for an effect.
Tim had earlier found that doses of 200 and 400 mg/day of DHA had no apparent effect.