What Chronic Constipation Is
Constipation can include infrequent bowel movements, hard or difficult-to-pass stool, straining, or a feeling of incomplete emptying. Chronic constipation lasts over time and may be related to diet, medicines, activity, pelvic-floor function, neurologic conditions, endocrine conditions, or other causes.
A change in bowel habits that persists or occurs with blood in stool, significant pain, vomiting, fever, anemia, or unexplained weight loss needs medical evaluation.
What Research Tells Us About Nutrition
NIDDK recommends adequate fiber and fluids for many people with constipation. Adults generally need about 22 to 34 grams of fiber per day depending on age and sex, and fiber is best increased gradually.
Fluid helps fiber work effectively, but there is no single fluid target for everyone. Kidney, heart, and other medical conditions can change appropriate fluid intake.
Foods and Nutrients Discussed in the Evidence
These foods and eating approaches are discussed in current guidance or research. Their role can vary with individual needs, symptoms, laboratory results, medications, and treatment.
Whole grains
Oats, whole-wheat products, barley, and other whole grains can increase fiber.
Beans and lentils
Legumes are concentrated fiber sources and can be increased gradually.
Fruits
Pears, berries, oranges, kiwi, and other fruits contribute fiber and fluid.
Vegetables
Broccoli, peas, carrots, greens, and other vegetables can build daily fiber intake.
Fluids
Water and other appropriate fluids help support stool softness and hydration.
Everyday Meal Ideas
These are general examples of how evidence-based nutrition principles can look in ordinary meals. They are not a prescribed disease diet.
Oatmeal with Pear & Berries
Whole grain plus fruit for a fiber-rich breakfast.
Lentil Vegetable Soup
Legumes and vegetables with whole-grain bread.
Bean & Brown Rice Bowl
Beans, whole grain, vegetables, and avocado.
Yogurt, Fruit & Oat Snack
Use dairy or a fortified alternative based on tolerance.
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When Individualized Help Matters
Increase fiber in steps rather than all at once, especially if you tend to have gas or bloating. Some people need specific treatment beyond diet.
Do not aggressively increase fiber when there is severe abdominal pain, vomiting, suspected obstruction, or a clinician has instructed you to follow a low-fiber plan.
Evidence & Trusted Sources
Evidence last reviewed: October 2026
Related Nutrition Guides
For educational information only
Feed Me Food provides general food and nutrition information for educational purposes. This information is not medical advice, diagnosis, treatment, or an individualized nutrition plan and is not intended to replace care from a physician, registered dietitian, or other qualified healthcare professional.
Nutrition needs can vary based on health history, medications, allergies, pregnancy, treatment, laboratory results, and other individual circumstances. If you have a diagnosed medical condition or have received specific dietary instructions, follow any specific advice your healthcare professional has given you.