GradedHealth

Digestive problems and IBS

Bloating, pain, constipation or diarrhoea, including irritable bowel syndrome.

24 findings across 12 topics. Strongest evidence: Psyllium Husk (A), Zinc (A), Low FODMAP Diet (B).

Grades show how certain the evidence is, not how big the effect is. How we grade evidence

What helps

Psyllium Husk

  • Improves overall symptoms of irritable bowel syndrome — Benefit, grade A: Strong
  • Relieves constipation and improves stool consistency — Benefit, grade A: Strong

Zinc

  • Reduces diarrhea and infection risk in deficiency — Benefit, grade A: Strong

Low FODMAP Diet

  • Eases IBS symptoms — Benefit, grade B: Moderate
  • Reduces bloating — Benefit, grade B: Moderate
  • Relieves belly pain in IBS — Benefit, grade B: Moderate

Probiotics

  • Eases irritable bowel syndrome symptoms — Benefit, grade C: Limited
  • Prevents C. difficile diarrhoea — Benefit, grade C: Limited
  • Prevents diarrhoea caused by antibiotics — Benefit, grade C: Limited

Kiwifruit

  • Eases constipation-related abdominal discomfort — Benefit, grade C: Limited
  • Helps you have more bowel movements — Benefit, grade C: Limited

Yogurt and Kefir

  • Yogurt and kefir help people with lactose intolerance digest lactose — Benefit, grade C: Limited

Carnivore Diet

  • Eases inflammatory bowel disease symptoms — Benefit, grade C: Limited

Boswellia

  • Shortens acute diarrhoea — Benefit, grade C: Limited

Ginger

  • Helps stomach emptying (digestion) — Benefit, grade C: Limited

Mixed evidence

Peppermint Oil

  • Eases IBS symptoms — Mixed results, grade C: Limited
  • Relieves belly pain in IBS — Mixed results, grade C: Limited

Low FODMAP Diet

  • Keeps IBS symptoms better over time — Mixed results, grade C: Limited
  • Works better than other diets — Mixed results, grade C: Limited

Kiwifruit

  • Kiwifruit extracts and supplements help constipation — Mixed results, grade C: Limited

Apple Cider Vinegar

  • Can cause digestive side effects — Mixed results, grade C: Limited

Oats

  • Can cause gas and digestive upset — Mixed results, grade C: Limited

Doesn't seem to help

Low FODMAP Diet

  • Changes bowel habits — No effect, grade B: Moderate

Peppermint Oil

  • Helps children with IBS — No effect, grade C: Limited