With regard to observed metabolic and immunological relations atopic e
czema might be considered as a primary congenital immunodeficiency dis
order due to an epithelial maturational deficiency caused by decreased
levels of 6-desaturated long-chain essential fatty acids. Early postn
atal substitution of the deficient tong-chain essential fatty acids du
ring the phase of postnatal T-cell maturation might have a preventive
effect on the development of the atopic immune system and the manifest
ation of atopic dermatitis. This view is supported by the observed ben
eficial effect of oral substitution of gammalinolenic acid in children
with atopic eczema. Presumably, present-day full-adapted infant formu
la lacks essential components for newborns at risk for atopy.