Can I sue if I ate a granola bar and it had worms in it?

Clearly the granola bars is not supposed to have worms inside.  This type of claim is for negligence and/or products liability.  Do you have the worms in the wrapper still?  did you take any pictures to document the worms as evidence of your claim?  If you did, you can certainly file a lawsuit against this company and the company is sure to settle to avoid the bad press they will get and the heat from the health department in their factory.  If you do not have any evidence other than you word, then you will have a difficult case as a result of a lack of evidence.  while you may testify to the worms your word will be the only thing you have.  I suggest hiring a lawyer to write  a letter to the company to see if he can settle this for some more money.  The company may settle to avoid the expense of a trial.