Turkey: the sleep story, and the vitamins the pot takes

Start with the thing every December repeats. Tryptophan shortened the time people spend awake at night only at doses of a gram a day and above, and below a gram the pooled trials found nothing. How much tryptophan is in a slice of turkey against a slice of chicken has not been published anywhere we can cite, so the honest version of this is that the effect needs a supplement dose and nobody has measured what your dinner delivers. The second belief goes the same way. Across 36 randomised trials, swapping red meat for poultry changed no cholesterol fraction, no apolipoprotein and no blood pressure reading. Only plant protein moved them. What turkey has in its favour is a large observational number. In three US cohorts of 407,270 people, each 50 g of white meat per 1000 kcal went with 26 percent less colorectal cancer, and that figure is a swap rather than an addition, because the models held total meat constant.

The numbers, per 100 g

What your body absorbs

• The meat factor, the long-standing reason to eat meat alongside iron, did not improve iron status over eight weeks when tested head to head against a plant-based imitation. — 52 non-pregnant women of reproductive age, mean 24 years, with serum ferritin below 25 µg/L (n = 52) Evidence B source
  Daily 32 mg elemental iron with a lunch containing 113 g of beef or of plant-based meat for 8 weeks raised ferritin by 10.7 µg/L and haemoglobin by 0.5 g/dL with no treatment-by-time interaction for any indicator (P > 0.05)

What cooking and storage change

• How the meat was cooked barely moved the cancer estimates in the largest pooled analysis, so the grill versus oven question matters less than how much is eaten. — the three pooled US cohorts with meat-cooking questionnaires (n = 407 270 participants) Evidence C source
  Adjustment for grilled or barbecued, pan-fried, oven broiled, and baked or microwaved cooking changed the estimates by much less than 10 percent, so cooking method was left out of the final models

What it does to your health

• Swapping red meat for poultry changed no blood lipid or blood pressure measure across 36 randomised trials, and only plant protein did. — 1803 participants in 36 trials published to July 2017 (n = 36 trials, 1803 participants) Evidence A source
  No significant differences against all comparison diets combined for total, LDL or HDL cholesterol, apolipoproteins A1 and B, or blood pressure. Against high-quality plant protein, red meat left total cholesterol higher by 0.264 mmol/L (95% CI 0.144 to 0.383) and LDL higher by 0.198 mmol/L (95% CI 0.065 to 0.330)
• In three pooled US cohorts, higher white meat intake went with 26 percent lower colorectal cancer risk, the opposite direction to red meat in the same analysis. — 407 270 US adults, median follow-up 13.8 years (n = 6640 incident colorectal cancers) Evidence C source
  HR 0.74 (95% CI 0.68 to 0.80) per 50 g per 1000 kcal of white meat, against a 35 percent increase per the same increment of total red meat

Safety, limits and interactions

• Half of all poultry products sampled worldwide carried Campylobacter, the highest share of any food group in the review. — food samples in 131 included articles worldwide (n = 131 articles) Evidence C source
  Pooled prevalence 51.9 percent (95% CI 47.0 to 56.7) in poultry products, 43.3 percent (17.9 to 68.7) in vegetable products, 5.50 percent in ready-to-eat foods

What people believe that the data does not support

• Tryptophan only moved sleep at doses of a gram a day and above, which is several times what a serving of turkey delivers. — participants of 18 collected articles, with 4 articles entering the pooled analysis (n = 18 articles reviewed, 4 meta-analysed) Evidence B source
  Wake after sleep onset shortened by 81.03 minutes per gram (P = 0.017, SMD -1.08, 95% CI -1.89 to -0.28), and the group taking 1 g or more had shorter wake after sleep onset than the group below 1 g (28.91 against 56.55 minutes, P = 0.001). No other sleep component changed
• Nobody has ever asked Europe for permission to claim anything about turkey, so the only legal wording left is the generic one for protein. — food labelling in the European Union (n = zero entries for turkey or poultry, four authorised entries for protein) Evidence E source
  The register holds no authorised, rejected or revoked claim naming turkey or poultry, while protein carries four authorised claims including maintenance of muscle mass

Who this works differently for

• Poultry does sit among the foods that raise serum urate, and the whole diet still explains under one percent of why one person has more urate than another. — 16 760 US adults of European ancestry, without kidney disease or gout and not on urate-lowering or diuretic drugs (n = 16 760) Evidence C source
  Seven foods including poultry were associated with raised serum urate, and each diet score explained no more than 0.3 percent of variance in serum urate, against a far larger share explained by inherited variants
• A systematic review of animal foods across the life course names poultry among the types where the evidence base is simply missing. — pregnancy and lactation, childhood, and older adults (n = a review of reviews, count of included studies not stated in the abstract) Evidence D source
  Substantial gaps in the evidence base were identified for populations outside high-income countries and for several animal food types including pig, poultry, less common livestock, wild animals and insects

What is still unknown

• That 26 percent is a swap and not an addition: the models held total meat constant, so more poultry meant less of something else. — the same 407 270 participants (n = three cohorts pooled) Evidence C source
  Models including meat variables were adjusted for total meat intake so that an increase in one meat type reflected a reduction in others, which the authors call the substitution model

The bottom line

Roast it. Turkey simmered and served without its juices keeps half the B6 and half the B12 that roasting keeps, 50 percent against 70 and 50 against 65, while potassium falls from 75 percent to 55 and niacin from 90 to 60. The lean boiled version people pick for their diet costs them most of the B vitamins the meat arrived with. Handle the raw bird as contaminated. Poultry carried Campylobacter in 51.9 percent of samples worldwide, the highest share of any food group in that review, which makes the raw meat and everything it touches the problem rather than the cooked slice. Gout deserves a calmer paragraph than it usually gets. Poultry does sit among the seven foods linked to higher serum urate in 16,760 American adults. In that same study each diet score explained no more than 0.3 percent of why one person has more urate than another, against a much larger share explained by inherited variants. The diet advice you were given is doing less work than it sounds like. Now the part that applies to every line above. Not one study on this page fed anybody turkey. Every number here was measured on white meat, on poultry, or on meat as a category, and turkey was assumed to behave like the group it was filed under. The European claims register holds nothing for turkey and nothing for poultry, no approved claim and no rejected one, because nobody has ever applied, so the only legal wording left is the generic one about protein. A review of animal foods across the life course names poultry among the types where the evidence base is simply missing, which is why we have nothing to tell you about how much of it a child should eat.

Sources

1. turkey-e-02 · randomised controlled trial
   Findings suggest that the "meat factor" does not contribute substantially to improvements in iron status in women of reproductive age with iron deficiency when consumed with an iron supplement for 8 wk.
   American Journal of Clinical Nutrition, 2025 · checked 2026-09-21
2. turkey-e-06 · pooled prospective cohort analysis, sensitivity analysis
   We further adjusted the models including meat variables for meat cooking methods (grilled or barbecued, pan-fried, oven broiled, and baked or microwaved), but since the changes in estimates were much less than 10%, we did not include them in the final models.
   International Journal of Cancer, 2018 · checked 2026-09-21
3. turkey-e-03 · meta-analysis of randomised controlled trials
   There were no significant differences between red meat and all comparison diets combined for changes in blood concentrations of total, low-density lipoprotein, or high-density lipoprotein cholesterol, apolipoproteins A1 and B, or blood pressure.
   Guasch-Ferré et al., Circulation, 2019 · checked 2026-09-21
4. turkey-e-04 · pooled prospective cohort analysis
   Each 50 g/1,000 kcal increase in white meat intake was associated with a 26% reduction in total colorectal cancer risk (HR: 0.74; 95% CI: 0.68-0.80), with a significant inverse right-to-left trend.
   International Journal of Cancer, 2018 · checked 2026-09-21
5. turkey-e-07 · meta-analysis of cross-sectional prevalence studies
   From the meta-analysis conducted at a 95% confidence interval, Campylobacter was highly prevalent in poultry products (51.9% [47.0-56.7]) and vegetable products (43.3% [17.9-68.7]), but least prevalent in ready-to-eat foods (5.50% [-0.31-11.3]).
   Critical Reviews in Food Science and Nutrition, 2026 · checked 2026-09-21
6. turkey-e-01 · meta-analysis of randomised trials
   In addition, the group receiving ≥1 g Trp supplementation had a shorter wake after sleep onset than the group with Trp < 1g supplementation (Trp <1 g vs Trp ≥1 g: 56.55 vs 28.91 min; P = 0.001).
   Sutanto et al., Nutrition Reviews, 2022 · checked 2026-09-21
7. turkey-e-10 · regulatory register, EU health claims
   POL-HC-6447 Protein Protein contributes to the maintenance of muscle mass Authorised
   EU Register on nutrition and health claims, European Commission, знімок 2026-09-21 · checked 2026-09-21
8. turkey-e-08 · meta-analysis of population-based cohorts
   Three diet scores, constructed on the basis of healthy diet guidelines, were inversely associated with serum urate levels and a fourth, data driven diet pattern positively associated with raised serum urate levels, but each explained ≤0.3% of variance in serum urate.
   Major et al., BMJ, 2018 · checked 2026-09-21
9. turkey-e-09 · systematic review of reviews
   There were substantial gaps in the evidence base for studies limiting our review, specifically for studies in populations outside high-income countries and for several TASF types (pig, poultry, less common livestock species, wild animals, and insects).
   Nutrients, 2024 · checked 2026-09-21
10. turkey-e-05 · pooled prospective cohort analysis, methods
    The models including meat variables were also adjusted for total meat intake, so that increases in the meat variable of interest reflected reductions in other meat types, and the total meat intake remained constant (“substitution model”).
    International Journal of Cancer, 2018 · checked 2026-09-21