1. I take four Kirkland Natural Fish Oil Omega 3 pills a day. Each pill has 1000 mg of total fish oil with 300 mg of DHA and EPA each. 1200 mg/day seems to be a good target amount. Here's a page comparing fish oil to flaxseed oil. Here are all of Seth Roberts' posts on Omega-3. Here is Tyler Cowen on his flaxseed oil supplement which he calls "good for his heart, brain, and gums" and says "the Omega-3 ingredient has a scientific consensus in its favor, with no evidence for negative side effects."
2. I'm tracking personal metrics. I'm starting with sleep and exercise. I record in Excel when I went to bed, when I woke up, and how many minutes I exercised. See the article titled You Are Your Data to learn about the burgeoning Quantified Self movement. I hope to track nutrition soon. And maybe one day I will be able to carefully track my time spent on different activities.
3. I'm interviewing local neuro-psychologists to see if they can help me understand how I learn. I am still unsure how I process information best. People with learning disabilities work with these folks. I don't think I have a learning disability but I do think I could do a better job at taking in information in ways that are optimal for my cognitive makeup. I'm also researching SPECT scans, but these have its critics and are expensive.
I'm not a self-improvement maniac. But I am on the lookout for ways to become healthier, happier, and smarter, and all these things seem likely to help in one or all of these fronts.