Fibrous materials are the worst culprit when it comes to crippling your garbage disposal. This includes fibrous materials like asparagus, celery, corn husks, artichokes and other vegetables that have any kind of stringy qualities to them. This is because the 'strings' actually wrap themselves around the blades and prevent the motor from turning. With enough fibrous material put down your garbage disposal, the motor will eventually wear out and have to be replaced. As well, large amounts of pasta can damage your garbage disposer's motor. So, if you put pasta down the drain make sure that it is a small amount, or feed it through the garbage disposal slowly. If you have a large amount of pasta to get rid of, it is probably best to put it in the garbage.
It is especially wise to be careful with any kinds of vegetables when using your garbage disposal. However, vegetable waste from potatoes, cucumbers, tomatoes, most fruit, meat scraps, and even small bones are okay as long as they are scraps and not large chunks of food waste. Remember, even a powerful garbage disposal can only handle so much waste. This is because a garbage disposal works with a blade that grinds food waste into a pulp which is then discharged into the drainage system with the use of water from the tap. So, in essence, a garbage disposal is not to be used for food waste that is too bulky to go through your drain pipes. This means that you have to dispose of food waste that is too large in the trash. Otherwise you will burn out the motor, or possibly even clog your drain pipes.
If there is more than one person living in your house, it is always good to post a set of rules for what can't go down the garbage disposal. Many people, especially children, don't understand that there is a lot of food waste that was not meant to be ground up by the disposal. This is normally the main cause of garbage disposal failure.