We use the present continuous (verb + ing), when we speak about something that is happening right now.
We use the Simple present (I do), when we speak about something that we generally/usually do (every day/often).
I am brushing my teeth (right now). I brush my teeth (every day).
I am eating meat (right now). I eat meat (generally).
I am not drinking beer (right now). I do not drink beer (generally).