Question

When multiple meals are analyzed together, three factors appear to be most relevant for iron absorption. Which of the following is NOT one of those factors?

a) Iron content of the meals
b) Presence of vitamin C
c) Phytate content in the diet
d) Fiber content in the diet

Answer 1

Vitamin C, iron content of meals, and phytate content are the three main factors that influence iron absorption, whereas dietary fiber is not typically considered a major factor.

Step-by-step explanation:

Among the factors important for iron absorption, the presence of vitamin C, iron content of the meals, and phytate content in the diet are known to be significant. Vitamin C enhances iron absorption by reducing ferric iron (Fe³+) to ferrous iron (Fe²+), which is more readily absorbed in the gastrointestinal tract. The iron content is directly related to the potential for absorption, as more available iron increases the chance for absorption. Phytates, found in cereals and grains, can bind iron, making it non-absorbable; thus, higher levels of dietary iron are necessary to offset this effect. On the contrary, fiber content in the diet is not typically listed as a primary factor influencing iron absorption and therefore is the correct answer for the given question.