I am obliged to disagree re "no evidence".
While it is true to say 'no proof' it is not true to say 'no evidence'...they are not one in the same/interchangable.
It may be fair to say from a given perspective "No evidence that I, or Science or Police Forensics would find acceptable"...but that is still not to say there is 'no evidence'.
When determining what's real or not, the only evidence I am prepared to accept is empirical objective scientific evidence.
Everything else is, again according to my view, opinion.
Also, proof is only relevant in Mathematics.
If this is so, and a satisfactory explanation for what 'love is', is there >any< thought, experience or belief held by humans that cannot be defined/explained in exactly the same terms?
Not really, no.
"Contentment is the result of electrochemical reactions in your brain"?
"Violence is the result of electrochemical reactions in your brain"?
"Theism and/or atheism is the result of electrochemical reactions in your brain"?
"Marxism is the result of electrochemical reactions in your brain"?
Those reactions/views as held by an individual can certainly, at least in theory, be narrowed down to electrochemical reactions in the brain.
It is important to note though that the brain does not exist in a vacuum all by itself. It lives in an environment filled with things that affect it directly or indirectly, not the least of which is other brains.
Love, like anger, may register as a stronger 'electrochemical reaction'...but all emotion and thinking will register as 'electrochemical reactions'.
Yes, but different electrochemical reactions.
Does the fact that everything we think and feel registers as an electrochemical reaction not render the conclusion that "love is the result" of such reaction...well... useless?
Not at all. Neurological-psychology is fascinating.
One might just as well say 'Love is the result of existing', no existing- no love.
Likewise "Love is the result of electrochemical reactions"...what transpires in the brain that >isn't<?
Also true, but the point I was making was that while some people insist on saying that "god is love" (or similar), there is absolutely no reason to. We can explain love as a natural (as opposed to supernatural) physical (as opposed to metaphysical) phenomenon, and that makes it not god by the dictionary definition of the word.