Our body and its genetics happiness consists of 30-50% of genetics linked happiness while rest depends upon food and habits .
Kinesin is driver not the happiness proteins.
We have the following :
SLC6A4 (serotonin transport)
DRD2
COMT
BDNF
No single "happiness gene" exists.
Food like Salmon fish ,eggs ,Nuts and chocolate played a very important role in happiness.