Leeks
Allium porrum
High FODMAP
Fermentable
Portion Sensitive
Fresh whole and sliced leeks

FODMAP/SIBO Rating

Avoid

Serving Size Consideration: One cup, chopped

Safe Serving Size: Green part only, 1/2 cup chopped

Active Compounds: Fructans, particularly in the white part

Fermentation Level:
High

Digestive Impact

Why it's problematic: High in fructans which can cause significant digestive issues in IBS-sensitive individuals

Specific symptoms: Bloating, gas, abdominal pain, and altered bowel habits

Typical reaction time frame: Symptoms typically appear within 30 minutes to several hours after consumption

Individual variation: Tolerance levels vary significantly between individuals

Safe Alternatives

Substitution ratio: Use green parts of chives or green onions in equal amounts for similar flavor

Processing Effects

Cooking does not significantly reduce FODMAP content

Freezing maintains FODMAP levels

Drying concentrates FODMAP content

Stacking Considerations

Avoid combining with:

  • garlic
  • onion
  • shallots
  • artichokes
  • wheat bread

Safe complementary foods: Can be safely combined with non-FODMAP vegetables and proteins

Reintroduction Guidelines
  1. Start with small amounts (1 tablespoon) of the green parts only
  2. Wait 24 hours to assess tolerance
  3. If well tolerated, gradually increase portion size
  4. Test white parts separately and in smaller amounts

Signs of success: No digestive symptoms within 24-48 hours after consumption

Hidden Sources

Common products containing garlic:

  • Stock cubes
  • Ready-made soups
  • Vegetable broths
  • Pre-made sauces
  • Frozen meal preparations

Alternative names: Wild leek, Ramp, Allium porrum, Poor man's asparagus

Individual Variables

Factors affecting tolerance:

  • Overall gut health
  • Stress levels
  • Time of consumption
  • Portion size
  • Preparation method

Tip: Green parts are generally better tolerated than white parts. Consider using only the green parts initially.