The press story is here and it is interesting how they say it talks of the benefit of a "low fat diet". It isn't really about a low fat diet if you look at the percentages. The more fat you have the lower the GI is anyway.
Barry Groves has an interesting article about the way in which acne benefits from a low carb diet.
Anyway, this seems like another reason to chose a low carb / paleo type diet.
The study is here, well the abstract anyway:
The effect of a high-protein, low glycemic–load diet versus a conventional, high glycemic–load diet on biochemical parameters associated with acne vulgaris: A randomized, investigator-masked, controlled trial
No previous study has sought to examine the influence of dietary composition on acne vulgaris.
We sought to compare the effect of an experimental low glycemic–load diet with a conventional high glycemic–load diet on clinical and endocrine aspects of acne vulgaris.
A total of 43 male patients with acne completed a 12-week, parallel, dietary intervention study with investigator-masked dermatology assessments. Primary outcomes measures were changes in lesion counts, sex hormone binding globulin, free androgen index, insulin-like growth factor-I, and insulin-like growth factor binding proteins.
At 12 weeks, total lesion counts had decreased more in the experimental group (−21.9 [95% confidence interval, −26.8 to −19.0]) compared with the control group (−13.8 [−19.1 to −8.5], P = .01). The experimental diet also reduced weight (P = .001), reduced the free androgen index (P = .04), and increased insulin-like growth factor binding protein-1 (P = .001) when compared with a high glycemic–load diet.
We could not preclude the role of weight loss in the overall treatment effect.
This suggests nutrition-related lifestyle factors play a role in acne pathogenesis. However, these preliminary findings should be confirmed by similar studies.