It is same for me therefore I have been writing for over five decades. It is impact on the cognitive and emotional system is well documented. Our genes play a role in behavior but intentional behavioural changes can make epigenetic effects which support your great ideas in this post. Therefore they are not controversial. Apart from writing for business, I particularly love expressive writing as it can bring therapeutic and financial benefits if done correctly. I wrote a guiding piece about it and give a friend link for any one interested can read it.