Life corresponds with the equilibrium of the whole universe, since we all represent the forces and powers of the universe to our own consciousness. But, this is not always  right or accurate and causes a complex imbalance that manifests as chaos and disease. To make it easy to understand : Good health and the source of harmony is the corresponding equilibrium of personal and universal energies.  The most important point here is, that thought is the process and link that makes possible this interchange of energy between man and the universe, in such a way that the crisis or perfect harmony has much to do with the way we think, since we attract good health as renovating strength of balance, or we attract chaos, death and destruction.
 It is necessary to say that good health and disease have many forms  of manifesting.  There are persons, who seem to be strong and healthy but in truth, they are spiritually dead and this is the most terrible and tragic illness because it means that everything has been lost.  Good health, has much to do with many aspects, as food, genetics, exercise, climate, among many things, but the most important aspect happens in our mind. People can talk about men with spirits of warriors, who seem strong and healthy, but I could say that these people may have an apparent good health, but if there is no Love in their hearts, they only have arrogance and spiritual ignorance, which will finally kill them. This is the reason that a serene, educated mind with a heart in love with life are so important. This means to live not only to have a good time, but to build something that death or disease can't easily snatch. Thought is creative, but does not create, since the mind is not God, but is capable of self attracting good or bad things. Cultivating Love, good, forgiveness, devotion and service, are not only qualities of those who meditate in remote mountains, but primordial, essential elements in the  lives of men.  The right thought will take us to a healthy life, and we will attract to us and to others, what we essentially feel and live in the intimacy of our thoughts.  Episodes of lack of love and terrible fears, may appear at times, but a mind and consciousness strengthened in Peace and Love, will overcome the darkest times. And when death  arrives, that spiritual consciousness will keep on living because the Love of God is alive in the one who loves Love.
And this is real good health.