Goal is to investigate the differences in skin condition and body composition among women with different dietary habits aged 30-45 years. Study will be focused onto sub-groups of female subjects following omnivorous, vegetarian or vegan diet.

Investigators will investigate differences among female subjects aged 30-45 years following one of the following diet for at least 3 years:

• vegan
• vegetarian
• omnivorous

Study will focus into the differences in dermal protein density and dermal thickness, skin hydration and trans-epidermal water loss. Study will focus also into body composition, specifically into % of body fat and % of lean body weight.

Inclusion Criteria:

• women
• aged 30-45 years
• vegan or vegetarian or omnivorous diet for at least 3 years,
• body mass index (BMI) between 18.5 and 25.

Exclusion Criteria:

• smoking or have smoked in the past (quit less than 3 years ago),
• pregnancy or breastfeeding,
• pre-menopause
• medications that increase skin dryness (e.g. retinoids),
• visiting solariums,
• visiting of the fitness center more than 3 times a week,
• regular consumption of protein supplements (including food supplements with collagen),
• chronic and acute skin diseases,
• chronic and acute diseases of the gastrointestinal tract (e.g. celiac disease),
• lactose intolerance,
• various diets (e.g. health, slimming),
• damaged skin in the test area (inner forearm),
• hyperhidrosis or increased sweating,
• diseases that cause a chronically damaged skin barrier (e.g. atopic dermatitis, ichthyosis),
• cancer diseases,
• pacemaker.

Healthy women aged 30-45 years following vegan or vegetarian or omnivorous diet for at least 3 years.