Negative and competitive social interactions are related to heightened proinflammatory cytokine activity
These findings suggest that daily social interactions that are negative and competitive are associated prospectively with heightened proinflammatory cytokine activity.
It is all about environment.....but that is not just diet, social interactions, other stresses are important too. Getting your stress under control - work, relationships etc - is as vital as diet. You can get diet and exercise dialed in but if you are chronically stressed from other things then you will still suffer.
I am like this at the moment from work and family pressures
There is a good commentary here.