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Loose stool , sometimes ribbon like , without blood, no.other complications, no weight loss , after going bathroom full stomach is empty, from past 3 months, eating dal once in a day , is due to

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ribbon like stool chronic loose stool causes IBS functional bowel

Here is a thorough analysis of the symptoms described:

Most Likely Causes of Loose, Ribbon-Like Stools for 3 Months

Symptom Summary

  • Loose stools, sometimes ribbon/flat-shaped
  • No blood, no weight loss
  • Feeling of complete emptying after defecation
  • Duration: 3 months
  • Diet: only dal (lentils) once a day

1. Irritable Bowel Syndrome - Diarrhea Predominant (IBS-D) - Most Likely

This fits the clinical picture very well. According to Goldman-Cecil Medicine and Yamada's Textbook of Gastroenterology:
  • IBS produces loose/watery stools and altered stool form (including flat or ribbon-like stools) due to intestinal spasms and abnormal contractions that temporarily narrow the stool passage
  • Flat/ribbon stools in IBS are caused by colonic muscle spasm, not a structural narrowing
  • Feeling of complete emptying after defecation is common in IBS-D (as opposed to the incomplete emptying feeling in IBS-C)
  • No alarm features are present: no bleeding, no weight loss, no anemia, no nocturnal diarrhea
Rome IV diagnostic criteria for IBS (from Goldman-Cecil Medicine):
  • Recurrent abdominal pain at least 1 day/week for 3+ months, associated with:
    • Change in stool frequency
    • Change in stool form/appearance
    • Related to defecation
  • Absent alarm symptoms (which this patient does not have - reassuring)
IBS affects 10-15% of the general population and is one of the most common causes of ribbon-like loose stools, per Aurora Health Care.

2. Dietary Cause / Nutritional Imbalance - Very Likely Contributing

Eating only dal (lentils) once a day is a significant clue:
  • Inadequate total food intake leads to reduced stool bulk and altered gut motility
  • Very high fiber, low overall caloric intake can cause loose stools and urgency
  • Lack of variety: No fat, animal protein, or complex carbs means altered gut transit
  • Lentils are high in FODMAPs (fermentable carbohydrates) - these are a well-known trigger for IBS symptoms including loose stools, gas, and bloating
  • Protein-energy malnutrition (even mild) affects intestinal mucosa health and can cause loose stools

3. Functional Diarrhea

If abdominal pain is absent or minimal, this may better fit functional diarrhea (a separate diagnosis from IBS) - recurrent loose/watery stools without significant pain, lasting >3 months with no identifiable organic cause.

4. Causes to Rule Out (Less Likely Given No Alarm Symptoms)

CauseWhy Less Likely Here
Colorectal cancerNo blood, no weight loss, likely young age
Inflammatory Bowel Disease (Crohn's/UC)No blood, no weight loss, no fever
Intestinal infection (Giardia, etc.)3-month duration less typical; no travel history mentioned
Celiac diseasePossible - especially given dal-only diet; worth a blood test
Colorectal strictureNo blood, no progressive worsening
Note: According to medical sources, over 95% of narrow/ribbon stool cases are benign (IBS, spasm, hemorrhoids). Serious causes like colorectal cancer almost always come with additional alarm symptoms (bleeding, weight loss, anemia) - none of which are present here.

What Likely Happened

The most probable explanation is IBS-D triggered or worsened by an extremely restricted diet (dal once daily). The gut-brain axis is disrupted, leading to:
  • Colonic spasm → ribbon/flat stools
  • Rapid transit → loose consistency
  • Complete evacuation sensation → typical of IBS-D, not structural disease

What Should Be Done

  1. See a doctor - 3 months of loose stools warrants evaluation
  2. Basic tests: CBC, CRP, stool examination (parasites, occult blood), celiac antibodies (tTG-IgA)
  3. Improve diet: Eat regular balanced meals - add rice, vegetables, curd/yogurt, roti. Avoid eating dal as the sole food
  4. If IBS confirmed: Low-FODMAP diet trials, stress management, probiotics
  5. Colonoscopy is generally NOT needed in young adults without alarm symptoms
Disclaimer: This information is educational and not a substitute for professional medical advice. Please consult a doctor for proper diagnosis and treatment.
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