What Is Roughage, and Why Is It Important to Eat It?

What Is Roughage, and Why Is It Important to Eat It?

Health experts have long recommended consuming roughage, commonly called fiber, to improve digestive health (1Trusted Source).
Roughage is the portion of plant foods, such as whole grains, nuts, seeds, legumes, fruits, and vegetables, that your body can’t digest.
However, it’s an important food source for the beneficial bacteria in your gut. It may also aid weight management and decrease certain risk factors for heart disease.
This article explains what roughage is, reviews its benefits, and provides a list of roughage-rich foods.
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What is roughage?

Roughage, or fiber, refers to the carbs in plants that your body cannot digest. This article uses the terms roughage and fiber interchangeably.
Once roughage reaches your large intestine, it’s either broken down by your gut bacteria or exits your body in your stools (2Trusted Source).
There are two main types of fiber — soluble and insoluble. Most foods high in roughage contain a combination of these but are usually richer in one type (3Trusted Source4Trusted Source).
In the gut, soluble fiber absorbs water to become gel-like. This allows your gut bacteria to break it down easily. Chia seeds and oats are both high in soluble fiber (2Trusted Source5Trusted Source6Trusted Source).
In contrast, insoluble fiber has a more rigid microscopic structure and does not absorb water. Instead, it adds bulk to stools. Fruits and vegetables contain high amounts of insoluble fiber (1Trusted Source4Trusted Source).
You should try to eat 14 grams of fiber for every 1,000 calories you consume per day. That’s about 25 grams for women and 38 grams for men. Unfortunately, only about 5% of people reach this recommendation (7Trusted Source).
Not eating enough fiber can negatively affect your health. For example, eating a diet low in fiber has been linked to digestive issues like constipation and dysbiosis, which is the abnormal growth of harmful bacteria in the gut (8Trusted Source9Trusted Source10Trusted Source).
Diets low in fiber are also associated with an increased risk of obesity, colon cancer, and breast cancer (11Trusted Source12Trusted Source13).
Benefits of roughage
You may have heard that adding roughage to your diet can improve your digestion.
Indeed, roughage has numerous healthy effects on your gut, such as increasing the bulk of stools, decreasing constipation, and feeding beneficial gut bacteria.
Foods high in roughage are also naturally richer in vitamins, minerals, and antioxidants than low-fiber foods like refined grains. Plus, they may even help you lose weight (14Trusted Source).

Improves digestion and gut health

Dietary fiber plays many different roles in gut health.
Insoluble fiber helps alleviate constipation by adding bulk to stools, while the gel-like consistency of soluble fiber helps move stools more easily through your digestive tract (15Trusted Source).
One study in over 62,000 women found that those who ate at least 20 grams of fiber daily were much less likely to experience constipation than those who ate only 7 grams or less per day (16Trusted Source).
Another study in 51 people looked into the effects of eating fiber on constipation. Every day for 3 weeks, participants ate 240 grams of bread — either rye or white. The rye bread contained 30 grams of fiber, while the white bread contained 10 grams.
Compared to the white-bread group, the rye-bread group experienced a 23% faster transit time of bowel movements, 1.4 more bowel movements per week, and softer stools that passed more easily (17Trusted Source).
Dietary fiber also act as a prebiotic, which feeds the beneficial probiotic bacteria in your gut, enabling them to thrive and limit the growth of harmful bacteria.
The prebiotics in fiber may also reduce your risk of colon cancer by promoting healthy bowel movements and strengthening the layer of tissue lining your intestines (18Trusted Source).

Helps you manage your weight

Consuming fiber may also help you reach and maintain a healthy weight.
In one study, 28 adults increased their fiber intake from 16 to 28 grams per day. They followed one of two high-fiber diets daily for four weeks — either 1.5 cups (318 grams) of beans or a combination of fruits, vegetables, and whole grains.
On both high-fiber diets, participants ate about 300 fewer calories per day and lost about 3 pounds (1.4 kg), on average. At the same time, they reported higher levels of fullness and less hunger than before they started the high-fiber diet (19Trusted Source).
Eating more fiber may also increase your resting metabolic rate (RMR), which is the number of calories you burn at rest.
A 6-week study in 81 adults found that those who ate a diet containing about 40 grams of fiber daily had a higher RMR and burned 92 more calories per day, compared to those who ate a diet with only about 21 grams of fiber per day (20Trusted Source).
In addition, many high-fiber foods, such as whole fruits and vegetables, are low in calories. Try eating more of these foods to feel full and satisfied. They will help keep your calorie intake low, which may promote weight loss.

May benefit blood sugar control

High-fiber foods help slow digestion, which may help stabilize your blood sugar levels by slowing the absorption of sugar into your bloodstream (21Trusted Source22Trusted Source).
In fact, some studies have shown that fiber may help regulate blood sugar and insulin levels. Insulin is a hormone that helps transport blood sugar into your cells and directs your body to burn it for energy or store it as fat (23Trusted Source).
Keeping blood sugar levels moderate is important, as spikes in blood sugar can damage your body over time and may lead to diseases like diabetes (24Trusted Source).
One study in 19 people with type 2 diabetes looked into the effects of eating a fiber-rich breakfast on blood sugar levels.
Those who ate a high-fiber breakfast that included 9–10 grams of fiber had significantly lower post-meal blood sugar than those who consumed a low-fiber breakfast containing only 2–3 grams of fiber (25Trusted Source).
What’s more, a study in 20 overweight adults found that those who consumed at least 8 grams of fiber at breakfast had lower post-meal insulin levels (24Trusted Source).
Maintaining low insulin levels may also help you lose weight by decreasing the number of calories your body stores as fat (26Trusted Source).

May decrease cholesterol and blood pressure levels

Dietary fiber may help lower high cholesterol and blood pressure levels, both of which are risk factors for heart disease.
One 28-day study examined the heart-healthy effects of eating fiber in 80 people with high cholesterol.
Researchers observed that people who ate 3 grams of soluble fiber daily from oats experienced a 62% reduction in total cholesterol and a 65% reduction in LDL (bad) cholesterol, compared to a control group (6Trusted Source).
In another 4-week study, 345 people ate 3–4 grams of beta-glucan, a soluble fiber found in oats, daily. This group experienced significant reductions in LDL (bad) cholesterol, compared to a control group (27Trusted Source).
Furthermore, eating fiber may reduce your blood pressure.
A review of 28 studies noted that people who ate diets higher in beta-glucan, a type of fiber found in oats, had lower blood pressure than those who consumed diets lower in this fiber (28Trusted Source).
To date, most of the research on fiber and blood pressure has focused on the effects of fiber supplements — not the fiber in food. Thus, more research is needed (28Trusted Source29Trusted Source30Trusted Source).
Foods high in roughage
Fiber, or roughage, is found in virtually all plant foods, including whole grains, fruits, vegetables, beans, nuts, and seeds.
However, some of these foods are naturally higher in roughage than others. Here are some of the best sources of roughage:
  • Chia seeds: 10 grams per 2-tablespoon (28-gram) serving (31)
  • Lentils: 8 grams per 1/2-cup (96-gram) serving (32)
  • Black beans: 8 grams per 1/2-cup (86-gram) serving (33)
  • Lima beans: 7 grams per 1/2-cup (92-gram) serving (34)
  • Chickpeas: 7 grams per 1/2-cup (82-gram) serving (35)
  • Wheat bran: 6 grams per 1/4-cup (15-gram) serving (36)
  • Kidney beans: 6 grams per 1/2-cup (125-gram) serving (37)
  • Flax seeds: 6 grams per 2-tablespoon (22-gram) serving (38)
  • Pears: 6 grams per medium (178-gram) pear (39)
  • Avocado: 5 grams per 1/2 avocado (68 grams) (40)
  • Oats: 4 grams per 1/2-cup (40-gram) uncooked serving (41)
  • Apples: 4 grams per medium (182-gram) apple (42)
  • Raspberries: 4 grams per 1/2-cup (62-gram) serving (43)
  • Quinoa: 3 grams per 1/2-cup (93-gram) cooked serving (44)
  • Almonds: 3 grams per 1-ounce (28-gram) serving (45)
  • Green beans: 3 grams per 1-cup (100-gram) serving (46)
  • Corn: 3 grams per 1 large ear (143 grams) (47)
These foods are particularly high in roughage, but many other whole foods can help you increase your fiber intake too.
Simply making an effort to include more vegetables, fruits, nuts, seeds, beans, and whole grains in your diet is an excellent way to increase your fiber intake and improve your overall health.
The bottom line
Roughage, or fiber, has long been recommended to help with digestive issues like constipation, but it also plays many other important roles in your body.
For example, the roughage in plant foods can promote optimal gut health, help you manage your weight, and even reduce your risk of heart disease.
Unfortunately, most people do not eat enough of this important nutrient.
Luckily, foods high in roughage are easy to add to your diet. Eating more healthy whole grains, legumes, fruits, vegetables, nuts, and seeds is a simple and delicious way to boost your fiber intake and improve your health.
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