I saw this film on TV in the late 70s-early 80s.
The premise is a Western businessman ends up on a remote Polynesian island where the natives are all very happy. The businessman discovers the secret to their happiness is a bar made from eucalyptus leaves. He sees this as a way to make his fortune, so he steals the recipe and finds his way off the island. Unfortunately, eating the eucalyptus bar makes people gain weight at an alarming rate, so his plan for wealth fails. I think there is also an active volcano on the island and this plays a part in destroying the businessman’s dreams.
I have tried Google and IMDB with no luck. I don’t recall any of the actors, just these fragments of the story line. Can anyone help please?
“Barnaby and Me”(1979 TV Movie)
http://www.imdb.com/title/tt0075728/
‘….they stumble upon a mysterious valley where the natives worship the koala and are ‘extraordinarily happy’. Leo discovers a money making bonanza, a special native confection which when eaten produces a happy euphoria. He decides to go into business, however their confection has a most unpleasant side effect…’
You can watch a clip here: https://www.youtube.com/watch?v=gsa8Amhbb5Y