Well, using anger to create can lead to relying on anger for the creative process, much in the way that using any one thing to create can. I don't have any hard evidence, but I have read about how anger and "just getting it out" can create neural pathways that over time result in resorting to anger more quickly than one would otherwise. This can happen for a lot of things, like how some people always react to something by making a joke. This is not to say that bottling up anger is good, just that letting it out without working through the anger might not be the best idea, writing while angry can be ok, as long as the anger is worked through in the process.

I've experimented with using different emotions and circumstances to keep the spark alive a bit and it's always lead to being in a rut. I think I mentioned in a previous post about my experiments with the creative process, but one of them was based on something I read about low calorie diets as linked to creativity. Basically, what I read was saying that human creativity, problem solving and intellect are linked to our drive to find food. So, by consuming very little food, the brain is then motivated to find ways to obtain food.

Anyway, I began eating only once a day to see how it would help with creativity. For a while, it worked, but then I noticed that all my stories and poems were centered around food, which might be cool if I were a food writer, but I'm not. That and food and sex started to intermingle in the writing in ways that were kind of interesting at the time, but I'm glad I'm not still in that vein.