I've been thinking about what goes into a healthy, contented life - note that I don't say a happy life, since I think things happen that sometimes make us unhappy, but that this doesn't mean that our life can't be one of contentment overall.
For me, there are a number of things that go into this - I think each person may have their own mix of what is needed. First, I need to treat my body well. This means that I need to eat foods that my body is designed to eat - a very wide variety of fruits and vegetables, some protein - but not too much - beans, legumes, whole grains and some dairy and eggs, and some traditional fermented foods - yoghurt, tempeh, miso, and some beer or wine. I try to avoid all manufactured, processed or artificial ingredients - if the food comes in a package I want the bare minimum of ingredients and they need to be real foods, not lists of chemicals or foodstuffs, however "natural", that come from a factory - the mysterious "natural flavorings" or any of the corn derivatives (like high fructose corn syrup) are cases in point.
And part of treating my body well is keeping moving - we were not designed to sit still. Keeping moving for me also isn't about going to the gym and working out - to my mind that's a little bit like substituting one artificial environment for another - I much prefer to be engaged in tasks that involve exercise, and that involve being outdoors. I'm a big fan of walking - almost anyone can do it, and it costs nothing. I think participating in the rhythm of the seasons, and the changes of light and weather, is one of the things that gives life meaning.
I try to have a life that has a rhythm to it - with regular mealtimes, a regular bedtime and I'm almost fanatical about getting enough sleep. I'm careful about caffeine and sugar in all its forms - both of which in excess can disrupt these natural rhythms. I think as regular eating and sleeping get out of balance, everything else does, particularly mentally.
Staying focussed is really important to me - being jumpy and distracted does nothing to lead to a contented life. I try to do one thing, and only one thing, at a time - I think multitasking is a myth - it's just doing a series of activities which intrude on one another and where a lot of energy is lost in the transition from one activity to another. As I'm engaged in an activity, I keep something to note down other thoughts that may arise - they don't escape but I don't have to follow them right now.
I want to be intellectually engaged with my world - to have interesting and challenging things to think about. I try to avoid things, like mindless activities and habits, that lead to mental apathy. I want to engage with new experiences and learn new things, but don't want to just chase sensation.
I think for most people having time with other people to enjoy their company and connect with something outside yourself is important too. In winter it's easy to get away from that and nest with family, and that's OK too for a time.
When dealing with feelings and emotions, I'm working on accepting what I feel, positive or negative - I think it's important not to try to drown out or ignore feelings. But I also think it's important to see them for what they are - momentary things that can be observed and then let go. This is an area of my life that's very much a work in process, and I expect it always will be. If we let our emotions and feelings become "us", they we're blown around by the winds of whatever we're experiencing at the moment. We have to remember that there's a core that is "us" that isn't this momentary experience or feeling - sometimes this is very hard to remember.