What are common symptoms with the introduction of a new or large amount of dietary fiber?

• A. Headache
• B. Nausea
• C. Severe dehydration
• D. Transient abdominal discomfort (bloating and flatulence)

Answer: (D)

Introducing more dietary fiber changes the gut environment, and the most common early reaction is transient abdominal discomfort, especially bloating and gas, from fermentation of the fiber by gut bacteria. This symptom typically appears soon after increasing fiber and tends to improve as the microbiota adapt and you adjust the amount gradually. To help prevent it, ramp up fiber slowly over one to two weeks, drink plenty of fluids, and choose a mix of soluble and insoluble fibers. While some people may notice nausea or headaches, they are not the typical early GI response, and dehydration isn’t a direct symptom of starting fiber ( though inadequate fluids can worsen GI symptoms).