Last reviewed: 2026-09-03 • Editorial Standards

Sea Urchin & Snails: Purine Ranking (Lowest to Highest)

Evidence-based comparison — data from USDA+ODS-NIH PURINE DATABASE Release 2 (March 2025)

Lowest Purine

#1sea urchin, raw137.3 mg/100g
#2Sea Urchin137.3 mg/100g
#3snails, raw182.2 mg/100g

Highest Purine

#3Sea Urchin137.3 mg/100g
#2sea urchin, raw137.3 mg/100g
#1snails, raw182.2 mg/100g

Category Average: 152.3 mg/100g/100g

The average across 3 foods with lab-measured data. Foods below this average are better-than-typical choices within this category.

How to Use This Ranking

The purine ranking is sorted from lowest to highest. Rank #1 is the lowest-purine food in the category. Foods in the top half (above median) should be consumed with more awareness of portion and frequency. The difference between adjacent ranks varies: in some categories, rank #5 and #10 might be only 10 mg apart; in others, the gap can be 100+ mg. Always check the actual milligram value, not just the position. Rankings do not account for fructose or alcohol — use individual food pages for a complete risk assessment.

ACR 2020 Guideline Context

The American College of Rheumatology recommends that gout patients focus on purine awareness rather than complete food group elimination. Within any category, there is a wide purine range. The goal is to shift toward lower-purine choices within categories you already eat, rather than eliminating entire food groups. This ranking helps you identify which specific items to prioritize and which to limit.

Japanese guidelines recommend under 400 mg of total dietary purines per day. Using this ranking, you can estimate how much of budget each food uses per typical serving.

How This Comparison Is Built

This comparison scores every food on three independent axes — purine content, fructose, and alcohol. Purine figures rely on the USDA+ODS-NIH PURINE DATABASE Release 2 (March 2025) and Kaneko et al. (Biol Pharm Bull 37(5):709-721, 2014, PMID: 24553148); fructose data comes from USDA SR28. Ratings follow ACR 2020: Safe when purine is under 50 mg and fructose under 2 g with no alcohol, Moderate between these, Avoid beyond, or whenever alcohol appears. Per-food data quality is flagged T1 (lab-measured), T2 (measured plus consensus), or T3 (category estimate).

This comparison is provided for informational purposes only and does not constitute medical advice. Individual tolerance to purines and fructose varies. Consult a healthcare professional for personalized dietary guidance. Last reviewed: 2026-09-03.

Frequently Asked Questions

Is sea urchin (uni) high in purines?
Yes — sea urchin measures 137.3 mg per 100g in our database, which places it in the Moderate range, similar to crab and some shellfish. Uni is the gonads of the urchin, and like most seafood gonads and roe, it concentrates purines. A small serving as sushi topping is unlikely to trigger a flare on its own, but frequent larger portions add up.
Are snails (escargot) safe for gout?
Snails measure 182.2 mg per 100g in our data — firmly in the Avoid range, higher than shrimp and comparable to some organ-adjacent seafood. Traditional escargot preparation with garlic butter adds saturated fat on top. If gout is active, snails are best left off the plate; in remission, a rare small portion is a judgment call to make with your own flare history in mind.
Why do shellfish-type seafoods vary so much in purines?
Purine content tracks the animal's metabolism and the tissue being eaten. Finfish muscle sits lower; roe, gonads (uni) and dark-meat mollusks sit higher. Our seafood rankings let you compare item by item rather than lumping all 'seafood' together, because the range is enormous — from about 20 mg in fish cakes to over 1, 000 mg in dried anchovies.