I had to abstain for a while.

But I typically drink 1-2 cups every morning.

I can tell when I've over drunk it - it makes me crash; like it makes my brain stop functioning well.

But the 1-2 cups in the morning often helps get me going.

It can be a fine line that can change - you just have to watch it for yourself as everyone's tolerance can be very different.

Take it easy with baby steps at first.