Constipation

Constipation is one of the most common digestive complaints, and one that often responds well to dietary changes. Defined clinically as fewer than three bowel movements per week, hard or lumpy stools, straining, or a sense of incomplete evacuation, constipation can improve with relatively simple dietary changes — though the right change depends on the underlying cause.

A common dietary contributor is insufficient fiber and water. Fiber feeds beneficial gut bacteria and adds bulk and softness to stool; water keeps stool hydrated as it moves through the colon. Beyond that, dairy can cause or worsen constipation in some people (especially in children with cow's milk protein sensitivity); processed foods low in fiber may contribute by displacing fiber-rich options; and very low-carbohydrate diets can produce sluggish stools, at least initially.

Common food patterns

Low-fiber diets (typical Western pattern, very low-carb diets) are commonly implicated. Dairy in sensitive individuals — children in particular are sometimes constipated by cow's milk. Diets dominated by red meat and processed meats with little accompanying fiber. Highly refined grain products. Excessive caffeine and alcohol can increase fluid excretion and may contribute to dehydration if total water intake is inadequate. On the other side, prebiotic-rich foods (oats, onions, garlic, bananas, beans) and adequate water can improve transit for many people, though sudden fiber increases can cause temporary bloating.

When to investigate further

Constipation that is new, severe, accompanied by blood in stool, unexplained weight loss, or alternates with diarrhea warrants medical evaluation. Chronic constipation that doesn't respond to dietary changes is worth working up for thyroid, neurological, or pelvic-floor causes.