The body is our temple and the brain the God within..
Pythagoras, the famous Greek mathematician said - Respect, don't neglect, your body. If your body is neglected, you will not be able to find the inner harmony -- because if the body is harmonious it helps to attain to inner harmony. Take every care of your health, of your body; love it, respect it, it is a great gift. It is a miracle! a mystery.
Neglect not thy health... he said ... Dispense with moderation, food to the body and to the mind repose. Health has two aspects to it. One is the physical, the other is the spiritual. The body is your temple, and your mind, the god within.
The Ancient Hindus, in the 'Upanishads' have said: "Anam Brahm" -- Food is God, God is food. In the sense of repose it is really food. As the body will die without food, the soul dies without repose.
The materialist in us thinks only of the body as a vessel for the brain, and the spiritualist in us thinks only of repose, and both remain lopsided. One has a very nourished soul but an undernourished body; the temple is in ruins. And one has a beautiful temple, but the diety is dead, or has not come yet. Both are missing something.
We need a harmony between the visible and the invisible. The body is visible, Mind is invisible. And we need both, and we need a rhythm between the two.
My answer to your question is - Yes, my body is indeed a temple of worship, which I need to keep in good form, only then the God within will remain alive.
Since everything is interconnected the brain and body cannot really be thought of as separate from each other, this is akin to 'nutritionism' thinking, breaking down complex creations of nature into individual parts. We need to take care of both, fuel them both appropriately and exercise both as needed to be holistically healthy.
If my body really was just a vessel to carry my brain I would still have to keep it in good shape for the sake of the brain. No avoiding the necessity of good bodily health.
I provide good nourishment, exercise, sleep, engage and challenge the brain, and avoid stuff that will damage the brain (now at least. A bit too much acid when I was younger. Limit that stuff!)
I started taking grape seed extract and astaxanthin about a week ago. I haven't really noticed a huge change in cognition but I am confident that these will produce good effects due to the research. I also take sublingual B12 now since higher levels seem to be better for the brain and I was actually a bit low even though I was eating meat. It's hard to tell if I was deficient in boron but if someone is deficient then their cognition suffers. http://www.ncbi.nlm.nih.gov/pubmed/7889884 etc, etc.
I'm not entirely sure what it will accomplish for the brain but I am working on my gut starting today. What with the role of gut flora in determining the health of the brain it seems important to keep those little critters happy.
You know better than I do that the brain is immensely complex and dependent upon a wide variety of substances and phenomenon to work properly. That is its beauty and its curse.
"They are in you and me; they created us, body and mind; and their preservation is the ultimate rationale for our existence. They have come a long way, those replicators. Now they go by the name of genes, and we are their survival machines."
-- Richard Dawkins, "The Selfish Gene"
This is interesting when you take into consideration what's being said about epigenetics lately. So here's a third possibility - take care of your genes. Feed them well.
I've thought about this a lot over my life and even though I want to say that I fully respect my body and cherish it like a temple I definitely feel like it's more so a vessel for my brain to exist. I have never been very closely connected to my body and have resented its form and function for as long as I can remember. It is a cause of endless confusion but in trying to get myself to manipulate it into what I'd be happier with I have slowly grown to accept it and really try to respect it as it is. I think I will always have a struggle getting to the point where I think of my body more positively than my brain but it's coming along little by little.