The reason processed cheese is bad for you is because process cheesed is high in salt content and high in calories as well.
When cheese is processed it gets the addition of salt added which can be bad for your health when too much salt is consumed.
A lot of processed cheese and other processed foods contain too much salt which can then lead to hypertension as well as obesity.
Processed cheese is really fattening so if you eat too much processed cheese it can cause an increase in weight gain and if you're looking to loose weight then eating processed cheese too much is not a good idea.
Processed cheese is usually also made without milk and instead made with vegetable oil or other oils that also make the cheese bad for your heart.
You could also get clogged arteries, heart disease, heart attacks, strokes etc when eating too much processed cheese or imitation cheese.
The healthiest cheese that you can eat is real cheese that is not processed.
Eat cheeses that actually contain milk and other natural ingredients.