Vitamin D -- the sun hormone. Life in environmental mismatch

Area of Science:

• Human Evolution
• Anthropology
• Nutritional Science

Background:

• Early Homo genus lost adaptive traits like body hair, relying on equatorial Africa's conditions.
• Upright posture and free hands facilitated tool use and significant brain development in Homo sapiens.
• Human expansion into diverse habitats was constrained by reliance on vitamin D, influenced by skin pigmentation.

Purpose of the Study:

• To investigate vitamin D sufficiency in Homo sapiens across varied global habitats.
• To determine optimal vitamin D requirements for human health and function.
• To explore the consequences of vitamin D deficiency and strategies for improved provision.

Main Methods:

• Review of evolutionary adaptations in the Homo genus.
• Analysis of the relationship between human migration, skin pigmentation, and solar UV radiation.
• Examination of vitamin D metabolism and requirements in diverse populations.

Main Results:

• Human evolution involved trade-offs, losing some adaptations while gaining cognitive abilities.
• Reduced skin pigmentation facilitated vitamin D synthesis in lower UV environments but poses deficiency risks.
• Vitamin D deficiency can have significant negative health consequences.

Conclusions:

• Ensuring adequate vitamin D intake is crucial for human health, particularly for populations in regions with less sunlight.
• Further research is needed to establish optimal vitamin D levels and effective supplementation strategies.
• Understanding vitamin D's role is key to supporting human adaptation and well-being in diverse environments.