
It is normal to experience excessive gas when transitioning to a vegetarian diet. This is because plant-based foods contain types of fiber and carbs that cannot be digested, leading to the production of gas in the large intestine. However, this excessive gassiness is only temporary and should subside after a few weeks as your body adjusts to the new diet. To reduce gas and bloating during this transition period, it is recommended to gradually increase your fiber intake, stay hydrated, and ensure thorough chewing of your food.
| Characteristics | Values |
|---|---|
| Cause of gassiness | Transitioning to a plant-based diet with more fibre and carbs |
| Temporary or permanent | Temporary |
| Time taken to stop being gassy | A few weeks |
| Tips to reduce gassiness | Gradually incorporate more plants into the diet, eat smaller meals, chew food well, drink plenty of water |
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What You'll Learn
- Excess gas is a normal side effect of a vegetarian diet, but it will pass in a few weeks
- Legumes, vegetables, and protein powders are common causes of gas
- Chewing food thoroughly can help reduce gas
- Drinking water aids digestion and helps prevent constipation
- Gradually increase your fibre intake to avoid gas and bloating

Excess gas is a normal side effect of a vegetarian diet, but it will pass in a few weeks
Transitioning to a vegetarian diet means you're likely consuming more legumes, which include lentils, beans, chickpeas, and soybeans. These foods contain indigestible carbohydrates called oligosaccharides. Bacteria in our gut ferment these carbs and produce gas, which can be uncomfortable. However, this is a good sign because it means those carbs are feeding your good gut bacteria and supporting a healthy gut microbiota.
The good news is that this excess gas is only temporary. Your body will adjust to the change in diet, and you'll be able to digest more foods before they reach the large intestine, resulting in less gas. Dr. Bulsiewicz, a gastroenterologist, confirms that this transition period usually lasts a few weeks.
In the meantime, there are some things you can do to reduce gas production. Firstly, gradually increase your fiber intake instead of making sudden changes. This gives your gut time to adjust to the new types of fiber in your diet. Secondly, when eating legumes, try soaking, cooking, and chewing them well. This can help reduce the amount of gas they produce. Additionally, drinking plenty of water can aid in digestion and prevent constipation.
While it may be an uncomfortable and embarrassing side effect, remember that it's normal and temporary. Your body is simply adjusting to a new way of eating, and soon enough, the excessive gassiness will pass.
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Legumes, vegetables, and protein powders are common causes of gas
Gassiness is a common side effect of switching to a vegetarian or vegan diet. This is because plant-based foods contain types of fibre and carbs that cannot be digested, leading to gas. However, this is only temporary, and after a few weeks, the body will adjust to the new diet, and the excessive gassiness will pass.
Vegetables that are known to produce gas include cruciferous vegetables like broccoli, cauliflower, and cabbage, as well as allium vegetables such as onions, leeks, and garlic. These vegetables contain complex sugars, such as raffinose and fructans, that are difficult for the small intestine to absorb, leading to increased gas production in the large intestine.
Protein powders, especially milk-based ones like whey or casein, can also cause gas due to the presence of lactose, which 75% of the population is intolerant to. However, plant-based protein powders like rice and pea powders are less likely to cause gas, as they have had most of their starch and fibre content removed.
It is important to note that while these foods are common causes of gas, they are also very nutritious and healthy. Therefore, it is recommended to consult a doctor or registered dietitian nutritionist (RDN) before eliminating them from your diet. Additionally, everyone's body reacts differently, so it is essential to pay attention to which foods cause the most gas for you and make adjustments accordingly.
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Chewing food thoroughly can help reduce gas
It is normal to experience excessive gassiness when transitioning to a vegetarian diet. This is because plant-based foods contain types of fiber and carbs that are harder to digest. However, there are ways to reduce gas production, such as by thoroughly chewing your food.
By chewing your food more slowly and thoroughly, you can improve your digestion and experience fewer digestive issues. This is because the process of digestion starts in the mouth, with enzymes being released when you chew that help prepare the food for digestion. These enzymes help to break down food into carbohydrates, proteins, and fats, and also help to increase the alkalinity of the food, which is important for digestion.
The recommended number of times to chew your food is about 32 times, although this may vary depending on the type of food. For harder-to-chew foods such as steak and nuts, you may need to chew up to 40 times, while softer foods like mashed potatoes and watermelon may only require 5-10 chews. In addition to improving digestion, chewing your food thoroughly can also help increase the amount of nutrients you absorb from your food.
In addition to chewing your food thoroughly, there are other ways to reduce gas when on a vegetarian diet. These include eating smaller meals throughout the day, reducing your intake of cruciferous and allium vegetables, and gradually incorporating more plants into your diet.
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Drinking water aids digestion and helps prevent constipation
A vegetarian diet can cause flatulence, or gas, due to the high fiber content of plant-based foods. This is a normal and temporary transition period as your body adjusts to the new way of eating. During this time, drinking water can aid digestion and help prevent constipation.
Water plays an important role in digestion by breaking down food so that your body can absorb nutrients more easily. It also helps to soften stools, making it easier to pass them. Additionally, water is essential for the proper functioning of dietary fiber.
When transitioning to a vegetarian diet, it is important to increase your fiber intake gradually. A sudden increase in fiber can lead to gut symptoms as your gut microbiota adjusts. Legumes, such as lentils, beans, chickpeas, and soybeans, are a common source of protein in vegetarian diets and contain indigestible carbohydrates that can cause gas. However, these carbohydrates are beneficial as they feed the good gut bacteria.
To aid digestion and prevent constipation, it is recommended to drink 80-100 ounces of water per day. Chewing your food thoroughly is also important, as digestion starts in the mouth. Chewing produces saliva, which helps break down food and aids in the digestive process.
By following these tips and giving your body time to adjust, you can manage any symptoms of gas and bloating associated with a vegetarian diet.
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Gradually increase your fibre intake to avoid gas and bloating
It is completely normal to experience gas and bloating when transitioning to a vegetarian diet. This is because plant-based foods contain types of fibre and carbs that cannot be digested, which then produce gas as they are broken down in the large intestine.
To avoid this, it is important to gradually increase your fibre intake. If you had a relatively small amount of fibre in your diet before and suddenly increased your intake, it could cause gut symptoms as your gut microbiota adjusts to the new diet. Therefore, it is best to start small and build up. For example, try adding a couple of tablespoons of beans to your meal to start with. Be mindful of other sources of legumes in your meal. While you may have a small amount of lentils added to your meal, are there other legumes you’ve added? Try to create a balanced meal by adding whole grains and veggies to your meals as well.
In addition, you can try to reduce the amount of cruciferous and allium veggies like cauliflower, broccoli, cabbage, onions, and leeks you eat—these foods are well-known to produce greater amounts of gas.
It is also important to chew your food well. Digestion starts in the mouth, so chewing your food well can help aid digestion. It also may help minimise the amount of air you swallow, which can contribute to bloating.
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Frequently asked questions
It is normal to experience excessive gassiness when transitioning to a vegetarian diet. This is because your body is adjusting to a new way of eating. The gassiness should subside after a few weeks as your body gets used to the diet.
Here are some tips to reduce gas when on a vegetarian diet:
- Gradually increase your fibre intake.
- Chew your food well.
- Eat smaller meals throughout the day and stop when you're full.
- Reduce your intake of cruciferous and allium veggies, such as cauliflower, broccoli, cabbage, onions, and leeks.
- Soak and cook beans for a long time.
A vegetarian diet can cause gas because it often includes foods that are high in fibre and contain indigestible carbohydrates, such as legumes, beans, and whole grains. These foods can be difficult for the body to digest, leading to increased gas production in the large intestine.











































