Enteral formulas supplemented with fiber are often used to prevent constipation in older adults. Which consideration is most important?

• A. Avoidance of lactose
• B. Lowering feeding rate to prevent bloating
• C. Addition of a prokinetic agent
• D. Provision of adequate water

Answer: (D)

The key idea is that fiber helps prevent constipation only when there is enough water for it to work with. Fiber added to enteral formulas increases stool bulk and requires moisture to form soft, easy-to-pass stool. In older adults, who are more prone to dehydration and may have reduced thirst or fluid intake, inadequate water can make high-fiber formulas counterproductive, raising the risk of hard stools, impaction, or even obstruction. Providing adequate free water supports stool softness, promotes regular transit, and allows the fiber to function as intended.

Lactose avoidance isn’t central to preventing constipation with fiber; some people tolerate lactose fine, and this choice doesn’t address the hydration and stool-softening mechanism. Slowing the feeding rate might help with bloating but doesn’t tackle the hydration requirement for fiber. Adding a prokinetic agent isn’t routinely indicated for constipation prevention in this context. Ensuring adequate water remains the most important consideration.