Which statement about dietary fiber is true?

Which statement about dietary fiber is true?

• A. Soluble fiber prevents constipation.
• B. Insoluble fiber reduces blood cholesterol levels.
• C. Soluble fiber is a bulking agent.
• D. Insoluble fiber is a bulking agent which prevents constipation; found in whole grain cereal and bread.

Answer: (D)

Insoluble fiber adds bulk to stool and speeds its passage through the gut, which helps prevent constipation. It’s abundant in whole grains, bran, and the skins of cereals, so describing it as a bulking agent found in whole grain cereal and bread fits the reality of how it works. Soluble fiber dissolves in water to form a gel and is better known for its effects on blood cholesterol and digestion, not for bulking stools. That’s why statements claiming soluble fiber prevents constipation or that insoluble fiber lowers cholesterol aren’t the best fits. So the true statement highlights the bulking action of insoluble fiber and its presence in whole grains, which aligns with how it helps maintain regularity.

Insoluble fiber adds bulk to stool and speeds its passage through the gut, which helps prevent constipation. It’s abundant in whole grains, bran, and the skins of cereals, so describing it as a bulking agent found in whole grain cereal and bread fits the reality of how it works.

Soluble fiber dissolves in water to form a gel and is better known for its effects on blood cholesterol and digestion, not for bulking stools. That’s why statements claiming soluble fiber prevents constipation or that insoluble fiber lowers cholesterol aren’t the best fits.

So the true statement highlights the bulking action of insoluble fiber and its presence in whole grains, which aligns with how it helps maintain regularity.