From the point of physics very simple to explain the beneficial power of love. Each person is a set of high-frequencies, a complex symphony of vibrations, controlled by his consciousness and - for the 95 percents - by subconsciousness.
And love is a certain phenomena, when two people meet whose main frequencies coincide, support and resonate each other.
As a result, those who love each other live brighter and more complete emotional lives and even their life expectancy should be longer, like life of resonating vibrations.
Unfortunately, love cannot last long, because these frequencies fade over time.
But we can imagine such great symphonies of frequencies and vibrations that can overcome these damping.
And modern physics provides the best evidences and hopes for that account. After all each person is the same extremely complex physical object, possessing colossal energies within, like power of love, which so far remain undisclosed and unused.
But when we fall in love with someone, at least for the first instances of this phenomena we begin to understand and feel the seismic energies hidden behind her.