I think that "weird bread" is a mistake on the part of the author, I've never heard of it and a search results in nothing. Perhaps you can link to the article where you found this sentence? "Lay out" here has no meaning by itself. It is a mnemonic device which means the purpose of "Don't Lay Out" is purely used to remember "Do Lots of Omega 3s". The D in Don't stands for Do, the L in Lay stands for Lots, and the O in Out stands for Omega. Similarly ROYGIBIV is a mnemonic device for remembering the colours in a rainbow Red, Orange, Yellow..... etc. Normally mnemonic devices are easy to remember things that trigger a memory of something more difficult. I think the author is trying too hard here since "do lots of omega 3s" is already easy enough to remember, also "do lots of" is bad usage. One would "do lots of" drugs, one does not "do" food, one "eats" food, omega 3s are food not drugs. Does that make sense?