Diet Ratings
Moderate net carbs (9g per medium onion). High natural sugar content. Use sparingly as flavoring rather than main vegetable.
Whole plant food, rich in quercetin and other antioxidants. Fully compliant with all vegan standards.
Bulb vegetable with quercetin and other antioxidants. Unprocessed and available to hunter-gatherers. Moderate carb content acceptable in normal portions.
Fundamental aromatic vegetable in Mediterranean cooking. Contains quercetin and other antioxidants. Base ingredient in traditional Mediterranean dishes. Minimal calorie contribution.
Plant-derived bulb vegetable. Contains plant compounds and carbohydrates. Explicitly excluded from carnivore diet by all authorities.
Whole, unprocessed vegetable with no excluded ingredients. Explicitly allowed in Whole30 program.
Onions are high in fructans. Monash rates onions as high-FODMAP at all practical serving sizes. Even small amounts (1 tablespoon = 10g) exceed FODMAP thresholds. Must be avoided during elimination phase.
Aromatic vegetable with potassium, fiber, and quercetin. Minimal sodium. Supports flavor development in DASH meals without salt reliance.
Moderate-glycemic vegetable with higher natural sugar content than non-starchy vegetables. Usable in Zone but requires careful portioning (typically 1/4 cup raw or cooked per meal block) to maintain macronutrient balance.
Rich in quercetin and other polyphenols with potent anti-inflammatory and antioxidant properties. Contains prebiotic inulin that supports beneficial gut bacteria. Raw consumption maximizes quercetin content.
Good fiber and prebiotic content (inulin) supports gut health, but raw onions can trigger reflux/nausea in GLP-1 patients. Cooked onions are better tolerated. Portion-dependent — small amounts as flavoring are ideal, large servings may cause GI distress.
iSome GLP-1 nutrition experts recommend raw onions freely for prebiotic benefits, while others advise cooking them first to reduce reflux risk. Individual tolerance varies significantly.
Controversy Index
Score range: 1–10/10. Higher controversy = more disagreement between diets.