James E. Dowd, Diana Stafford "The Vitamin D Cure," 2008

The book explains why vitamin D deficiency has become widespread and how it is linked to a wide range of issues — from osteoporosis, muscle pain, and frequent colds to metabolic syndrome, type 2 diabetes, depression, and cardiovascular risks.

The authors highlight the key reasons for the deficiency (latitude and seasonality of sunlight, indoor lifestyle, excess weight, age, dark skin, sunscreen), propose a simple correction strategy: measure 25(OH)D, aim for the optimal range (around 40–60 ng/ml), combine safe sun exposure with sensible supplements and a diet rich in magnesium, calcium, and omega-3, as well as adjust body weight and sleep patterns.

The central idea: restoring vitamin D status is an inexpensive and powerful "lever" for preventing chronic diseases and improving well-being, which should be done consciously and under the control of 25(OH)D levels.
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