It's actually memory improvement, mindfulness and now what was the 3rd book in the set? I read this on my kindle around March during my improve myself phase. I wasn't that impressed by the first book memory improvement, it consisted in listing all the things you could play to improve your memory such as: card games, computer games, board games, memory matching, sudoku, crosswords, jigsaws, rubik's cube. All pretty obvious really.
The next book I think was mindfulness and included nutrition? I'm not really sure now. Although I did learn that you need to eat wild salmon to get enough omega 3 benefits. Farmed salmon doesn't grow big enough to produce anywhere near the amount of omega 3 fatty acids the body needs, so we must all find wild salmon, although I'm not sure where I can find any round here so I'll have to stick to the tablets.
I think the last book could have been stress but it was somewhere around easter a few months ago and I've been to bed since. I think the middle book was the most useful, the mindfulness one.