Diet, sleeping habits, age, and sex may predict the nature of the skin’s sebum content, subcutaneous hydration, and pH. This is according to study data published in the Journal of Cosmetic Dermatology.

The study enrolled 300 volunteers between the ages of 20 and 69 years. Trained resident doctors administered a standardized questionnaire that asked participants about their dietary intake, whether or not they stayed up late, and time spent using electronics (eg, mobile phones and computers). 

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