Acne vulgaris (AV) is a chronic inflammatory disease of the pilosebaceous unit, characterized by the formation of comedones, erythematous papules, and pustules. Less frequently it is presented by nodules, deep pustules, or 
pseudocysts and, in some cases, is accompanied by scarring. (Simpson and Cunliffe, 2004)AV is the most common dermatological condition encountered in adolescents, as almost every one worldwide has acne to some extent 
during puberty. It has a prevalence of almost 85% in people aged 12-24 years. (Krowchuck, 2000)The impact of diet on acne vulgaris is still a very controversial matter, but it can't be neglected. If a patient notes a positive relation between a particular dietary factor and acne severity, he should be instructed to exclude it from diet or decrease its consumption. 
(Kucharska et al., 2016).
In 2005, Adebamowo et al., conducted a cohort, retrospective study on about 50 thousands women. They were asked to recall their high school diet using a validated food frequency questionnaire. The authors found that there was a positive relation between acne and the reported quantity of consumed milk, particularly skimmed milk. Chocolate is always believed to be a considerable factor that may contribute to aggravation of acne, but there is a very limited amount of 
evidence supporting its negative impact on the skin. On the other hand, dermatologists often observe that patients have new pimples a few days after ingestion of products containing chocolate (Costa et al., 2010).
Acne is one of the most frequently reported skin conditions connected to menstrual cycle. Period-related hormonal breakouts are very common in the peri-menstrual phase (Hermanns-Le et al., 2013; Geller et al., 2014)