Changes in Bowel Movements After Dieting with IBS - Gastroenterology and Hepatology

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After two months of dieting for weight loss, my stools have become thin and watery. I have a history of irritable bowel syndrome (IBS)?


Hello Doctor, I have had a history of being unable to gain weight since childhood, often overeating, but I have also experienced chronic diarrhea until about the age of 18.
I underwent a colonoscopy at Taichung Veterans General Hospital, and the doctor found no issues, suggesting it might be irritable bowel syndrome (IBS).
Diarrhea has been a norm for me.
However, about two months ago, I started a diet to lose weight, consuming only a 200g piece of chicken and some steamed vegetables daily.
Since then, my bowel movements have decreased and become more watery.
I also began experiencing bloating and burping.
Although I had diarrhea frequently before the diet, I occasionally noticed that my stools were somewhat formed but thin, about the size of a pinky finger, and segmented, accompanied by gas that disperses in water.
Initially, the stools were formed, but upon contact with water, they disintegrated into very thin pieces.
The stools feel somewhat weak, lacking the sensation of being pushed out, but their color is normal.
As long as I eat daily, I have a bowel movement once a day without any noticeable blood or abnormal color.
I am very concerned about the possibility of cancer.
Additionally, I have been doing sit-ups and leg raises; I wonder if this could be putting pressure on my intestines and causing these symptoms.

Wei, 20~29 year old female. Ask Date: 2021/01/31

Dr. Yang Zhichao reply Gastroenterology and Hepatology


Hello Mr.
Wei: Based on your description, it still appears to be irritable bowel syndrome.
If you are concerned, we can arrange for a routine stool examination.
Thank you for your inquiry.

Reply Date: 2021/01/31

More Info


Based on your description, it seems you are experiencing significant changes in your bowel habits and gastrointestinal discomfort, particularly after initiating a restrictive diet. Your history of diarrhea and the diagnosis of irritable bowel syndrome (IBS) at a young age suggest that your gastrointestinal system may be particularly sensitive to dietary changes.

Firstly, it’s important to understand that IBS is a functional gastrointestinal disorder characterized by symptoms like abdominal pain, bloating, and altered bowel habits (diarrhea, constipation, or alternating between the two). The symptoms can be exacerbated by stress, dietary changes, and other lifestyle factors. Given that you have a long-standing history of IBS, it’s likely that your current symptoms are related to this condition.

Your recent dietary changes, which involve a significant reduction in caloric intake and a limited variety of foods, can lead to several gastrointestinal issues. The body requires a balanced intake of nutrients, including carbohydrates, proteins, fats, vitamins, and minerals, to function optimally. A diet consisting solely of chicken and steamed vegetables may lack essential nutrients and fiber, which can lead to changes in bowel movements. The reduction in fiber intake can result in harder stools or changes in stool consistency, which may explain the watery stools and gas you are experiencing.

The symptoms of bloating and increased gas production can also be attributed to the types of foods you are consuming. Certain vegetables, especially cruciferous ones like broccoli and cauliflower, can cause increased gas production in some individuals. Additionally, if you are consuming a lot of protein without adequate fiber, this can lead to digestive discomfort.

The fact that your stools are described as thin and segmented, and that they break apart in water, may indicate a few things. While these characteristics can be concerning, they are not definitive indicators of serious conditions like colorectal cancer, especially given your age and the absence of blood in your stool. However, it is essential to monitor these changes closely. The normal color of your stool is reassuring, but any persistent changes in bowel habits, especially if accompanied by weight loss, severe abdominal pain, or blood in the stool, should prompt a visit to a healthcare provider for further evaluation.

Regarding your concern about exercising, while physical activity is generally beneficial for digestive health, excessive abdominal exercises could potentially lead to discomfort if your core muscles are overly tight or if you are not allowing adequate recovery time. It’s essential to listen to your body and adjust your exercise routine accordingly.

In summary, your symptoms are likely related to your restrictive diet and underlying IBS. Here are some recommendations:
1. Reintroduce a Balanced Diet: Gradually reintroduce a variety of foods, including whole grains, fruits, and healthy fats. This will help improve your fiber intake and overall nutrient balance.

2. Stay Hydrated: Ensure you are drinking enough water, especially if you are experiencing diarrhea.

3. Monitor Symptoms: Keep a food diary to track what you eat and how it affects your symptoms. This can help identify any specific food triggers.

4. Consult a Healthcare Provider: Given your history and current symptoms, it would be wise to consult a gastroenterologist. They may recommend tests such as a colonoscopy or other imaging studies to rule out any serious conditions.

5. Consider Stress Management: Since IBS can be exacerbated by stress, consider incorporating relaxation techniques such as yoga, meditation, or deep-breathing exercises into your routine.

By taking these steps, you can work towards managing your symptoms more effectively and improving your overall gastrointestinal health.

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