A new study showing the role diet plays in acne was just released in July 2007.
I have uploaded the file in the FILE section of the web site which you can
access
and download the study.

It is also available to read at the following url >

http://www.medscape.com/viewarticle/560567

Here is a part of the study:

Acne is a common skin disorder in a primary care setting. It affects individuals
of all ages.
In Western populations, acne is estimated to affect 79% to 95% of adolescents,
40% to 54%
of individuals older than 25 years, and 12% of women and 3% of men by middle
age.
Although the pathogenesis of acne is currently unknown, recent epidemiologic
studies
of non-Westernized populations suggest that dietary factors, including the
glycemic
load, may be involved. It has been postulated that the frequent consumption of
high
carbohydrates lead to hyperinsulinemia. Hyperinsulinemia has been implicated in
acne pathophysiology because of its association with increased androgen
bioavailability and free concentrations of IGF-I.

The objective of this study was to determine whether a low-glycemic-load diet
improves acne lesion counts in young men.