My Mom gave me the following advice:
1) Don't buy or consume any foods with the word's "Chef" or "blend" on it.
2) Don't buy any book with a picture of the author that's more than 1/4 of the dust cover size.
In other words, stay away from trendy books or ones by famous stars (Suzanne Summers comes to mind...) You can usually find these a year later at the discount bin for $2.99.