Lifestyle factors affecting the pathogenesis of androgenetic alopecia: a literature review.

Dietary habits influence AGA pathogenesis through multiple nutritional pathways.

• High-fat and high-sugar diets may exacerbate AGA by promoting inflammation, oxidative stress, and hormonal dysregulation.
• Deficiencies in micronutrients such as iron, zinc, selenium, and vitamins (including vitamin D) have been associated with hair loss and may contribute to AGA progression.
• Mediterranean diet patterns, rich in antioxidants and anti-inflammatory compounds, have been suggested to have a protective effect against AGA.
• Alcohol consumption and smoking are dietary/lifestyle factors noted to negatively impact hair follicle health and AGA progression.

Sleep disturbances and circadian rhythm disruption are associated with AGA pathogenesis.

• Poor sleep quality and sleep deprivation can elevate cortisol levels and promote systemic inflammation, which may exacerbate AGA.
• Circadian rhythm disruption affects the hair follicle cycle, as hair follicles possess their own peripheral circadian clocks that regulate cycling between growth and rest phases.
• Sleep disorders such as obstructive sleep apnea have been linked to increased AGA risk, potentially through hypoxia-induced mechanisms and hormonal changes.
• Melatonin, whose secretion is tied to sleep patterns, has been shown to play a role in hair follicle biology and may be protective against AGA.

Ultraviolet (UV) radiation exposure contributes to AGA pathogenesis through oxidative and structural mechanisms.

• UV radiation induces oxidative stress in scalp tissue and hair follicles, damaging follicular DNA and cellular structures.
• UV exposure promotes the production of reactive oxygen species (ROS), which can impair hair follicle function and accelerate miniaturization.
• Chronic UV exposure may upregulate expression of matrix metalloproteinases and inflammatory cytokines in the scalp, contributing to follicular damage.
• UV-induced degradation of structural hair proteins may compound hair shaft fragility in AGA-affected individuals.

Exercise has a dual and complex relationship with AGA, with effects depending on type and intensity.

• Moderate aerobic exercise may be beneficial for AGA by improving scalp microcirculation and reducing systemic inflammation and oxidative stress.
• High-intensity exercise and anabolic steroid use associated with bodybuilding can elevate androgen levels, potentially accelerating AGA in genetically predisposed individuals.
• Exercise influences hormonal profiles including testosterone and dihydrotestosterone (DHT), which are central mediators of AGA pathogenesis.
• Regular moderate physical activity may mitigate metabolic syndrome components such as insulin resistance and dyslipidemia, which have been linked to AGA.

Certain hairstyles and hair care practices can induce or exacerbate AGA-related hair loss.

• Traction hairstyles that exert prolonged mechanical tension on hair follicles can cause traction alopecia, which may overlap with or worsen AGA.
• Tight hairstyles such as ponytails, braids, and buns create chronic mechanical stress that may accelerate follicular miniaturization in AGA-susceptible individuals.
• Frequent use of heat styling tools, chemical treatments, and harsh hair care products can damage the hair shaft and scalp environment, potentially compounding AGA.
• Scalp massage has been proposed as a beneficial hair care practice that may promote hair growth by stretching dermal papilla cells and improving blood flow.

AGA pathogenesis involves interconnected mechanisms including androgen signaling, inflammation, oxidative stress, and microbiome alterations that lifestyle factors can modulate.

• Dihydrotestosterone (DHT) binding to androgen receptors in genetically susceptible follicles remains the central driver of follicular miniaturization in AGA.
• Chronic low-grade scalp inflammation, including microinflammation around the follicular infundibulum, is recognized as a contributory mechanism that lifestyle factors such as diet and sleep can influence.
• Oxidative stress from multiple lifestyle sources (UV exposure, poor diet, sleep deprivation) converges on hair follicle biology to impair the growth phase.
• The scalp microbiome may mediate some lifestyle effects on AGA, as dietary and hygiene habits influence microbial composition, which in turn affects follicular inflammation.

AGA is a widespread condition with significant psychosocial burden that makes long-term lifestyle management clinically relevant.

• AGA significantly impairs patients' social interactions and psychological well-being.
• Treatment of AGA is described as 'a long-term process that is difficult to stick to,' motivating interest in adjunctive lifestyle interventions.
• Current literature on lifestyle impacts on AGA is characterized by the authors as 'limited and fragmented.'
• The review identifies establishing effective lifestyle intervention protocols to delay disease progression as 'a central focus for both clinicians and patients' in long-term AGA management.