Sweetbreads: rich in protein, and the gout question is still indirect

Sweetbreads are rarely studied on their own, and most of what applies to them comes from research on gout, purines and meat in general. The strongest finding is a randomized trial in 90 people with gout, where a 42 day dietary intervention lowered serum uric acid by 112.4 micromol/L more than in the control group, with purine and energy limits combined so the purine share cannot be separated. In the USDA survey data, from a record that names neither the animal nor the gland, one pair of sweetbreads weighs 6.7 oz (190 g) and gives about 236 calories, 42.7 g protein and 659 mg cholesterol, along with 74 mg vitamin C. Frying concentrates the meat as it loses water. Raw lamb sweetbread in UK tables has 131 calories and 15.3 g protein per 3.5 oz (100 g), fried in corn oil 217 calories and 28.7 g.

As people eat it, per 3.5 oz (100 g)

How much is actually in it

• UK composition data show raw lamb sweetbread at 131 calories and 15.3 g protein per 3.5 oz (100 g), rising to 217 calories and 28.7 g after frying in corn oil as water is lost. — CoFID 2021 codes 18-421 Sweetbread, lamb, raw and 18-422 Sweetbread, lamb, fried in corn oil (n = 2 records) Evidence E source
  Per 100 g raw vs fried: energy 131 vs 217 calories, protein 15.3 vs 28.7 g, fat 7.8 vs 11.4 g, water 75.5 vs 57.7 g, vitamin B12 6.0 vs 3.0 mcg; raw cholesterol 260 mg

What a real portion looks like

• USDA survey data put one pair of sweetbreads at 190 g, about 236 calories with 42.7 g protein, 659 mg cholesterol and 74 mg vitamin C. — FNDDS food code 25140110 Sweetbreads, WWEIA Liver and organ meats (n = 1 record) Evidence E source
  Per pair (190 g): 236 calories, protein 42.7 g, fat 5.9 g, cholesterol 659 mg, vitamin C 74 mg, vitamin B12 5.4 mcg, zinc 4.0 mg, iron 2.3 mg, sodium 695 mg

What your body absorbs

• In a crossover RCT in 20 healthy adults, ribavirin taken after a low-purine meal reached 36% higher peak levels than after a high-purine meal. — 20 healthy participants, single 600 mg oral ribavirin dose (n = 20) Evidence B source
  Low- vs high-purine meal: Cmax 136% (90% CI 120%-155%), AUC0-inf 139% (90% CI 120%-159%)

What cooking and storage change

• By the USDA retention table for organ meats other than liver, frying keeps about 60% of vitamin B6 and 80% of vitamin B12, while simmering keeps 55% and 75%. — USDA Retention Factors Release 6, Beef Products, ORGAN MEATS(NOTLIVER) FRIED and SIMMRD,W/DRIP Evidence E source
  Fried: B6 60%, thiamin 70%, vitamin C 80%, B12 80%, zinc 100%; simmered with drippings: B6 55%, folate 70%, B12 75%, vitamin C 80%, iron and zinc 100%

What it does to your health

• Observational data from 19 studies link red meat intake with 29% higher odds of gout. — 19 prospective cohort or cross-sectional studies (n = 19 studies) Evidence C source
  Gout OR 1.29 (95% CI 1.16-1.44) for red meat

Safety, limits and interactions

• In 8 recurrent kidney stone formers on a metabolic ward, a high animal protein diet raised urinary urate by 90% versus an isoenergetic low animal protein diet. — 8 recurrent renal stone-forming patients, metabolic ward, 2 weeks per diet (n = 8) Evidence C source
  Urinary urate +90% on high vs low animal protein diet; serum urate did not change consistently
• Laboratory data pooled from 75 articles and 8,585 samples found ochratoxin A in 39% of meat and offal products, highest in poultry gizzard. — 75 articles, 8,585 samples of meat, edible offal and meat products (n = 8585 samples) Evidence D source
  Prevalence 39%; highest in poultry gizzard (66%), lowest in cow liver (2%)

Who this works differently for

• In an RCT in 90 gout patients, a 42-day low-purine, energy-restricted diet lowered serum uric acid by 112.4 µmol/L more than in the control group. — 90 patients with gout, 45 per group, 42 days (n = 90) Evidence B source
  Serum uric acid -112.4 µmol/L vs control (p = 0.007)
• Observational data from 8 studies of 47,879 people with gout link high purine intake, especially from animal sources, with more gout flares. — 8 studies (5 cohorts, 2 case-crossover, 1 RCT), 47,879 adults with gout, mostly men aged 55-66 (n = 47879) Evidence C source
  High animal purine intake a risk factor for gout exacerbation; size not pooled

The bottom line

Cooking costs some vitamins. By USDA factors for organ meats other than liver, frying keeps about 80 percent of vitamin B12 and 60 percent of vitamin B6, and simmering keeps 75 and 55 percent, figures for the whole group from a 1975 table with no measurement of thymus itself. The gout link is observational and indirect. Pooled studies tie red meat to 29 percent higher odds of gout (odds ratio 1.29, 95% CI 1.16 to 1.44), and offal was not analyzed on its own. A review of studies in people who already have gout names high purine intake, especially from animal foods, as a risk factor for flares, without a pooled size. We have no measurement of how much purine sweetbreads contain, so we cannot rank them against other meats. Who should be careful: if you have gout, the trial above is the evidence that diet moves uric acid. If you form kidney stones, a non-randomized study of 8 recurrent stone formers on a metabolic ward found a high animal protein diet raised urinary urate by 90 percent over 2 weeks against a low one, while blood urate did not change consistently. If you take ribavirin, a crossover trial in 20 healthy adults found a low-purine meal gave peak drug levels 136 percent of those after a high-purine meal (90% CI 120 to 155 percent), with sweetbreads themselves never tested. Surveys pooled from 75 articles found ochratoxin A, a mold toxin, in 39 percent of 8,585 samples of meat and offal products, highest in poultry gizzard, with no figure for thymus. We have no card on eating sweetbreads raw, on pregnancy or on children.

Sources

1. swbr-r3-02 · CoFID 2021, dataset
   CoFID 18-421 Sweetbread, lamb, raw: Energy 131 kcal; Protein 15.3 g; Fat 7.8 g; Water 75.5 g; Cholesterol 260.0 mg; Vitamin B12 6.0 µg; Vitamin C 18 mg; Iron 1.70 mg; Zinc 1.9 mg. CoFID 18-422 Sweetbread, lamb, fried in corn oil: Energy 217 kcal; Protein 28.7 g; Fat 11.4 g; Water 57.7 g; Vitamin B12 3.0 µg; Vitamin C 23 mg; Iron 1.80 mg; Zinc 3.6 mg
   CoFID 2021, Public Health England / OGL v3.0, codes 18-421 and 18-422 · checked 2026-10-02
2. swbr-r3-01 · USDA FNDDS, dataset
   Sweetbreads (FNDDS 25140110, FDC 2706158, WWEIA Liver and organ meats): 1 pair = 190 g; Quantity not specified = 85 g; per 100 g: Energy 124 kcal; Protein 22.49 g; Total lipid 3.08 g; Cholesterol 347 mg; Vitamin C 39.1 mg; Vitamin B-12 2.83 µg; Zinc 2.11 mg; Iron 1.23 mg; Sodium 366 mg
   USDA FNDDS 2021-2023, food code 25140110 (FDC 2706158) · checked 2026-10-02
3. swbr-r3-04 · Randomized crossover trial
   Twenty healthy participants were enrolled in a randomized, 2-period crossover study. ... In comparison with corresponding plasma values of ribavirin following a high-purine meal, C(max), AUC(0-144) and AUC(0-infinity) of ribavirin following a low-purine meal were 136% (90% confidence internal [CI]: 120%-155%), 134% (90% CI: 118%-153%), and 139% (90% CI: 120%-159%), respectively.
   J Clin Pharmacol, 2009 · checked 2026-10-02
4. swbr-r3-03 · USDA Retention Factors R6, dataset
   USDA-RETN-R6:1181 ORGAN MEATS(NOTLIVER) FRIED (Beef Products, code 13): vitamin_b6_mg 60%; thiamin_mg 70%; vitamin_c_mg 80%; vitamin_b12_ug 80%; zinc_mg 100%. USDA-RETN-R6:1183 ORGAN MEATS(NOTLIVER)SIMMRD,W/DRIP: vitamin_b6_mg 55%; folate_total_ug 70%; vitamin_b12_ug 75%; vitamin_c_mg 80%; iron_mg 100%; zinc_mg 100%
   USDA Table of Nutrient Retention Factors, Release 6 (2007), Retn_Code 1181 and 1183 · checked 2026-10-02
5. swbr-r3-06 · Meta-analysis of observational studies
   Meta-analysis revealed several dietary associations with gout risk: red meat: OR 1.29 (95% CI 1.16-1.44)
   Asia Pac J Clin Nutr, 2018 · checked 2026-10-02
6. swbr-r3-08 · Controlled clinical trial
   Eight recurrent renal stone-forming patients were housed in a metabolic ward and fed on a low (LPD) and a high (HPD) animal protein diet, which were isoenergetic. ... There was a 90% increase in urinary urate on HPD compared with LPD, whereas serum urate did not change consistently.
   Clin Sci (Lond), 1983 · checked 2026-10-02
7. swbr-r3-09 · Meta-analysis of food surveys
   Seventy-five articles comprising 8585 samples were identified and analyzed. ... The overall prevalence of OTA in MOP was 39%. ... Concerning food type, OTA prevalence was highest in the poultry gizzard (66%) and lowest in the cow liver (2%).
   Food Chem Toxicol, 2023 · checked 2026-10-02
8. swbr-r3-05 · Randomized controlled trial
   A total of 90 patients with gout were randomly allocated to either the intervention group or the control group, with 45 cases in each group. ... Compared with the control group, the intervention group showed a significant reduction in serum uric acid (sUA) level by 112.4 μmol/L (p = 0.007).
   Nutrients, 2026 · checked 2026-10-02
9. swbr-r3-07 · Systematic review
   Conversely, high purine intake (especially animal sources), excessive alcohol consumption, and obesity are risk factors for gout exacerbation.
   J Health Popul Nutr, 2025 · checked 2026-10-02