I figure it's a long shot for consumption to be affected by the damage decrease talent, but it's good to hear that my self heal may get a buff
Its rather easy to check. Respec with empty body, cast self heal, look at numbers.
The. Respec without it, cast self heal and compare.
I'd also bet it does though.
As for consumption, its not damage taken, its a trade off of health for force. It won't be affected by sith defiance.