Depends on what doctor or guru you follow. It is plant based and it does have nutritive value only miniscule.

Depends on what a person is trying to accomplish. If autoimmune problems or some health issues it is just another avenue of eliminating all possibilities from the diet that could be causing problems.

For most people it is not an issue, at least in my opinion. A few others think differently.

If you like coffee you can find research saying how good it is. If you don't like coffee you can find research saying how bad it is. Choose your poison.

As I have my morning coffee.