To prevent constipation one should eat food rich in?

* Fiber adds bulk to your stool: Fiber doesn't get digested by your body, so it passes through your digestive system largely intact. This adds bulk to your stool, making it easier to pass.

* Fiber absorbs water: Fiber helps to absorb water in your digestive system, making your stool softer and easier to eliminate.

Here are some food groups that are high in fiber:

* Fruits: Berries, apples, pears, bananas, oranges, etc.

* Vegetables: Broccoli, spinach, Brussels sprouts, carrots, beans, etc.

* Whole grains: Whole wheat bread, brown rice, quinoa, oats, etc.

* Legumes: Beans, lentils, chickpeas, etc.

* Nuts and seeds: Almonds, walnuts, flaxseeds, chia seeds, etc.

Tips for increasing fiber intake:

* Start slowly: Don't drastically increase your fiber intake overnight. Too much fiber can lead to gas and bloating. Start by adding a few extra servings of high-fiber foods to your diet each day and gradually increase your intake.

* Drink plenty of water: Fiber absorbs water, so it's important to drink plenty of fluids to help keep your stool soft. Aim for 8 glasses of water per day.

* Choose whole grains: When choosing breads, cereals, and pasta, opt for whole grain options.

* Add fruits and vegetables to every meal: Include a variety of fruits and vegetables in your diet to ensure you are getting enough fiber.

Important Note: If you experience persistent constipation, it's always best to consult a doctor to rule out any underlying medical conditions.