Increasing agent for omega-3-based fatty acid in biological tissue and nutritive composition containing the same

PURPOSE:To provide the subject agent (a medicinal agent) capable of promoting learning ability development, containing, as active ingredient, a nucleotide mixture comprising cytidine monophosphate, uridine monophosphate, adenosine monophosphate, guanosine monophosphate, inosine monophosphate, etc. CONSTITUTION:The objective nutritive composition which contains the substances capable of increasing polyvalent unsaturated fatty acids (esp., omega-3-based fatty acids) such as arachidonic acid and docosahexaenoic acid in the cerebral cortex and also of promoting cerebral and nervous functions (e.g. learning ability development) can be obtained by incorporating a nutritive composition comprising proteins, fats, glucids, minerals and vitamins with, on a solid basis, 5-120mg/100g of a nucleotide mixture composed of 1.5-50mg/100g of cytidine monophosphate, 0-20mg/100g of uridine monophosphate, 0-15mg/100g of adenosine monophosphate, 0-15mg/100g of guanosine monophosphate, and 0-15mg/100g of inosine monophosphate.