What is a potential consequence of consuming too much dietary fiber?

• A. No effect on minerals
• B. Interferes with mineral absorption
• C. Increases mineral absorption
• D. Improves mineral absorption

Answer: (B)

Excess dietary fiber can bind minerals in the gut and form complexes that aren’t absorbed, reducing their bioavailability. This effect is most notable for minerals like iron, calcium, zinc, and magnesium, especially when fiber intake is very high or when phytates in plant foods contribute to mineral binding. So, consuming too much fiber can interfere with mineral absorption rather than enhancing it. In typical amounts, fiber still provides benefits and doesn’t routinely cause this issue, but the potential for reduced mineral uptake explains why interference is the best answer.