Some types of fibre can bind and impair the absorption of what nutrients?

Question

BlackTom AI · Accepted Answer

Briefly restating the question: which nutrients can be bound by certain fibres, impairing their absorption?

Option a: Negatively charged minerals that are divalent (-2) or trivalent (-3). In reality, the minerals most affected by fibre binding are positively charged metal ions (such as Ca2+, Fe2+/3+, Zn2+), not negatively charged minerals. The charge and chemical form described in this option do not align with the common mechanism of fibre–mineral interactions, making this choice inaccurate.

Option b: Monosaccharides and disaccharides. Dietary fibre’s binding and impairment of absorption is not typically described for simple sugars themselves. Fibers influence mineral and some vitamin absorption more than they affect the uptake of basic carbohydrates, so this option misidentifies the primary nutrients involved and is therefore incorrect.

Option c: Positively charged minerals that are divalent (+2) or trivalent (+3). This aligns with the known mechanism whereby certain fibres (and associated compounds) can chelate or bind divalent and trivalent minerals such as calcium (Ca2+), iron (Fe2+/3+), magnesium (Mg2+), and zinc (Zn2+), reducing their absorption in the gut. The description matches the minerals affected by fibre interactions and is the correct choice.

Option d: Water-soluble vitamins. While some nutrients can have altered absorption under various conditions, fibre’s binding effects are most classically described with divalent/trivalent minerals rather than water-soluble vitamins. This option does not accurately reflect the primary nutrient groups impacted by fibre binding, making it incorrect.

Some types of fibre can bind and impair the absorption of what nutrients?单项选择题

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