From what I read and understand... processed meats are not the healthiest for you.  That would include items like bologna and hot dogs, and probably sausage might be included in that as well.  Processed meats tend to have higher levels of nitrates, sodium, and some added sugars.   A pork burger - made of just ground pork - I would not include in that mix.  If you are making your own sausages, you have an idea of what is going into them, and you can decide whether it is healthy or not.