Some loving ways in which we can shift toward taking better care of ourselves and thereby be more prepared to experience joy and happiness include:

sensible eating, 
regular exercise 
     (with stretching before and after),
meditation, 
study and contemplation, 
adequate rest, 
and in general seeking moderation 
     (avoiding extremes).

It is very important, however, to avoid condemnation of ourselves for not doing the above or only partially doing so.