Why were settled foragers better off than farmers?

Well farmers for one had a strict diet, with what ever they were growing, this caused not a very helthy nutrietious diet so the foragers were also in a way alot healthier. Secondly if anything happened to the famers crops they were basically screwed since they depended on in earlier societies only a single crop. Foragers could easily move on to a new location if animals got scarce. btw...sorry for the spelling errors >.<