Should I Change How I Speak and Write?

I've read recently that psychologists have conducted research suggesting that people with deteriorating brains from Alzheimer's and other dementias exhibit telltale signs early on in the ways they speak and write. That is, they express themselves with diminishing sophistication in their syntax and resort to more concrete words and convey fewer abstract ideas. 

If neuropathology causes this degradation of language, I'm wondering if this unfortunate process might work both ways. That is, if a deteriorating brain causes deteriorating use of language, might deliberately simplifying one's syntax and using simpler and more concrete words cause the brain to deteriorate faster or in worse ways than it would otherwise?

I ask because I feel a growing urge to radically change the way I write and speak so that it's much simpler, clearer, and more succinct than it has been.

Of course, I want to continue addressing the generally abstract topics and issues that interest me most not only without oversimplifying them but by being more incisive than I ever have before. Yet, I wonder if this is even possible, and worse still, whether I might initiate my brain's precipitous decline.

I tell myself that the greater effort I'll need to make to speak and write the way I wish will preserve and maybe even strengthen my brain's verbal centers and my corresponding language fluency. I also plan to do even more focused and extensive reading in various subjects, to write more, and to even systematically expand my vocabulary. So, maybe my concerns are groundless.

But they're still my concerns.