Leena Watts
It is a common experience to have increased gas and bloating when switching to a plant-based or vegetarian diet. This is due to the higher fiber content in these diets, which the body is not used to processing in such large quantities. The gut will typically adjust to the new diet within a few days to a few weeks, and the gas and bloating will subside. However, if the symptoms persist or are accompanied by pain or discomfort, it may indicate a more serious digestive issue, such as irritable bowel syndrome, and a doctor should be consulted.
| Characteristics | Values |
|---|---|
| Cause of gas | High-fibre foods, lactose, gluten, fructans, sugar alcohols, swallowing air |
| Reducing gas | Gradually increase fibre intake, cook vegetables, drink water, chew ginger, drink plant-based solutions, swallow less air, eat smaller meals, eat slowly, take probiotics |
| Time to adjust | A few days to several weeks |
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What You'll Learn
High-fibre foods can cause gas
A vegan or vegetarian diet is typically much higher in fiber than an omnivore diet. This sudden increase in fiber can cause bloating and gas as the gut adjusts to the new diet. Plant foods contain fiber that is not digested and ends up filling the stomach and digestive tract, leading to a bloated feeling. The fiber is broken down by bacteria in the gut, which produces gas as a byproduct. This gas, along with the food and liquid in the digestive tract, contributes to the bloated sensation.
When switching to a plant-based diet, it is common to experience increased gas and bloating as the body adjusts to the higher fiber content. This adjustment period can last from a few days to several weeks and may be helped by gradually introducing high-fiber foods. During this time, the gut bacteria adapt to the new diet, and the body becomes better at digesting and absorbing the fiber before it reaches the large intestine, reducing gas production.
There are several ways to reduce gas and bloating when increasing fiber intake:
- Cooking gas-inducing vegetables, such as broccoli, cauliflower, and cabbage, instead of eating them raw, helps break down starches and fibers, making them less likely to cause gas.
- Soaking or sprouting legumes and grains can aid in pre-digesting starches and carbs, reducing gas potential.
- Probiotics, found in fermented foods like kimchi, miso, tempeh, sauerkraut, and sourdough bread, can help minimize bloating and improve digestion.
- Drinking water helps break down food during digestion, reducing bloating.
- Chewing on ginger or peppermint can help reduce gas and flatulence.
It is important to note that while some gas and bloating are normal, persistent or painful symptoms could indicate a more serious digestive issue, such as irritable bowel syndrome, and should be discussed with a doctor.
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Fructans and sugar alcohols in vegetables
Fructans are a type of carbohydrate, or sugar, that some people have difficulty digesting. They are a type of oligosaccharide, which are part of a class of small-chain carbohydrates or sugars known as FODMAPs (fermentable oligosaccharides, disaccharides, monosaccharides, and polyols). Fructans are found in a variety of natural foods, including fruits, vegetables, and cereal-based products.
Vegetables that are particularly rich in fructans include artichokes, garlic, leeks, onions, and spring onions. Other vegetables, such as kidney beans, soya beans, and watermelon, also contain fructans but in lower amounts. Fructans can be difficult for the human body to digest because they are not absorbed in the small intestine and instead pass into the large intestine, where they can be fermented by gut bacteria, producing gas and flatulence.
Sugar alcohols, such as sorbitol and mannitol, are also found in some vegetables and can contribute to gas production in the gut. Vegetables that contain sugar alcohols include cauliflower, snow peas, sweet potatoes, mushrooms, celery, and avocado. Replacing these vegetables with zucchini, cucumber, leafy greens, tomatoes, and carrots may help reduce gas production.
It is important to note that not everyone experiences gas and bloating when consuming fructans and sugar alcohols. Individual tolerance varies, and some people may be able to consume small amounts of these compounds without issue. Additionally, the body can adjust to a new diet over time, and gradually increasing the intake of plant-based foods can help reduce gas and bloating. Cooking vegetables, as opposed to consuming them raw, can also help pre-digest some of the gas-producing ingredients, such as starch and fiber.
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Foods served with veggies can be the cause
Gas and flatulence are a normal part of the digestive process. The average person passes gas more than 10 times a day. However, it can be uncomfortable and embarrassing. When switching to a vegan or vegetarian diet, it is common to experience increased gas and flatulence. This is because plant-based diets are typically much higher in fiber than omnivore diets.
While the body adjusts to the new diet over time, the foods served with vegetables can be the cause of gas and flatulence. If you have been eating more vegetables with cheese or mixed with milk and cream, the higher lactose intake could be triggering your symptoms. Gluten is another element that could be causing flatulence. If you eat tempura vegetables or wheat-based pasta with your vegetables, the gluten could be responsible.
Some other common foodstuffs that can cause gas and flatulence include onions, garlic, and fatty foods. Onions contain fructan, which is difficult for the small intestine to absorb. Garlic may cause gas and bloating in some people, and in rare cases, a person may have an allergy or intolerance to garlic. When the body has to work hard to digest fatty foods, such as fried foods, gas may become trapped in the gut.
Sugar-free gums and ultra-processed foods are also common culprits, as they are often sweetened with sugar alcohols that are harder to digest. Carbonated drinks can add significantly to the amount of air swallowed, which can lead to gas and bloating. Beer, in particular, is a carbonated beverage that can lead to excess gas and bloating due to the presence of gluten and the gas from the carbonation process.
It is important to note that everyone's body is different, and some people may be more sensitive to certain foods than others. If you are experiencing excessive gas or bloating, it is a good idea to consult a doctor or a registered dietitian to help pinpoint the culprits in your diet.
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Cooking methods can reduce gas
A sudden increase in fibre intake can cause bloating and gas. This is because the gut needs time to adjust to the new diet. Plant-based diets are typically much higher in fibre than omnivorous diets, and insoluble fibre, found in whole grains, brown rice, broccoli and cauliflower, cannot be digested by the body.
Cooking vegetables can help to reduce gas. Baking, steaming, sautéing, or grilling vegetables breaks down starch and fibre, making them easier to digest. Soaking or sprouting legumes and grains can also help to reduce gas, as it aids the digestion of starches and carbs.
Some vegetables are more likely to cause gas than others. Fructan, a type of carbohydrate that cannot be digested, is found in some vegetables and becomes food for the bacteria in the gut, which can lead to gas and flatulence. Vegetables containing fructans include Brussels sprouts, cauliflower, snow peas, sweet potatoes, mushrooms, celery, and avocado.
However, it is not always the vegetables themselves that cause gas, but the foods they are served with. Lactose, found in cheese, milk, and cream, can cause flatulence, as can gluten, found in wheat-based pasta and tempura vegetables.
There are other ways to reduce gas and bloating. Digestive enzyme supplements can help to break down foods, and it is recommended to eat more slowly to swallow less air. Walking after eating can also reduce gas and improve digestion.
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Probiotics and digestive enzymes can help
It is normal to experience gas when switching to a plant-based diet, and it doesn't last forever. This is because plant-based diets are typically much higher in fiber than omnivorous diets, and insoluble fiber found in whole grains, brown rice, and veggies like broccoli and cauliflower cannot be digested by the body. As a result, the fiber is broken down in the large intestine, producing gas in the process.
Digestive enzymes are proteins that your body makes to break down food and aid digestion. They can be found in the stomach, small intestine, and pancreas. Digestive enzyme supplements are also available over the counter, and they are particularly helpful for supporting the digestion of hard-to-digest trigger foods, making it easier to enjoy a wide range of foods in comfort. It is recommended to take them before or during meals so that they have enough time to reach the small intestine, where most digestion occurs.
It is important to note that a well-balanced diet that contains fresh fruits and vegetables, lean proteins, and whole grains is the best way to support your digestive enzymes. In addition, some lifestyle changes such as consuming smaller, more frequent meals and practicing stress-reduction techniques like meditation or deep breathing exercises can also help improve digestive health.
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Frequently asked questions
A veggie diet can cause gas because it is often high in fiber, which the body is not used to processing in large quantities. The body grows new gut bacteria to deal with the extra fiber, and the process of growing this bacteria produces more gas.
The gas should go away as your body adjusts to the new diet. This can take anywhere from a few days to several weeks, or even months.
To reduce the gas, you can introduce fiber-rich foods gradually, so your body has more time to adjust. You can also try cooking gas-inducing foods, as cooking helps to break them down, resulting in less gas. Additionally, drinking more water can help break down food during digestion, reducing gas.
Vegetables such as broccoli, cauliflower, and cabbage tend to cause more gas when eaten raw. Brussels sprouts, as well as fructan-containing vegetables, can also cause gas. Lactose-containing foods such as cheese, milk, and cream, as well as gluten-containing foods, may also be the culprit.
Yes, painful, ongoing, or excessive gas that interferes with your daily tasks can indicate a more serious digestive problem such as irritable bowel syndrome, inflammatory bowel disease, or colorectal cancer. If you experience these symptoms, consult a doctor.
