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. 2010 Oct 27;140(12):2268S–2285S. doi: 10.3945/jn.109.119024

FIGURE 1.

FIGURE 1

Contribution of preformed vitamin A and β-carotene to the total vitamin A intake. (A) Relation between the required vitamin A intake (Ref = reference value for the given population) and the intake of preformed vitamin A products from food. If this intake is not sufficient, the difference (gap) between the reference intake and the real intake of preformed vitamin A has to be filled by β-carotene. Some theoretical intake situations are shown in (B). Intakes of preformed vitamin A and β-carotene after conversion to RE. Under intake situations 1 and 2 (group I), the reference value is reached largely independently of the conversion factor for β-carotene. Under intake situations 3 and 4 (group II), the reference value is reached if the conversion factor used is adequate. Group III (intake situations 5, 6, and 7) do not reach the reference value. Please note that reference values and conversion factors currently used are different in different countries.