here's something interesting I found that suggests a link
between certain fruits and a nervous system disorder similar
to Parkinsonism:

http://news.bbc.co.uk/hi/english/health/newsid_401000/401480.stm

A few disclaimers:

1. The above article is in the popular press. Skepticism is
advised, as there is often little similarity between actual
scientific research, and popular press accounts thereof.
In other words, read the research article in a peer-reviewed
scientific publication - when it is published - to get the whole
story.

2. The article implies that the tea is made from the fruit -
however, one must wonder if it is instead made from the leaves?

3. Fruits in the Annona family are mostly tropical. The only
Annona found in temperate zones is the pawpaw (not the papaya,
a different fruit). Tropical Annonas include: sugar apple,
custard apple, cherimoya, soursop, atemoya, etc. See "Fruits
of Warm Climates" by Julia F. Morton for info on the Annonas.

Tom Billings