Meat loaf: what ground beef studies say about a dish nobody has tested

No study we found looked at meat loaf itself, so everything here comes from ground beef. In a randomized crossover trial, 25 men with a mean BMI of 31.2 ate five 115 g ground beef patties a week for 5 weeks, at 24% or 5% fat. Both HDL and LDL cholesterol fell with both patties, and the abstract gives p values without the size of the change. In a second trial of only 12 older men and postmenopausal women, patties at 18% or 25% fat raised blood palmitic acid and the larger LDL fractions. Neither trial added bread or egg the way a loaf does. A homemade meat loaf in the UK food table has 213 calories, 16.6 g of protein and 10.9 g of fat per 3.5 oz (100 g). That is one recipe, and the fat moves with the mince you buy.

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

How much is actually in it

• A homemade meat loaf in the UK food table has 213 calories, 16.6 g protein and 10.9 g fat per 3.5 oz (100 g), with 12.7 g carbohydrate from the bread or crumbs that bind it. — CoFID 2021 code 19-605, Meat loaf, homemade Evidence E source
  Per 100 g: 213 calories, protein 16.6 g, fat 10.9 g, saturated 4.01 g, carbohydrate 12.7 g, iron 1.83 mg, zinc 2.5 mg, sodium 154 mg

What a real portion looks like

• US dietary surveys weigh a medium slice of beef meat loaf at 108 g and a large slice at 144 g. — FNDDS portion weights for Meat loaf made with beef (FNDDS 27214100, FDC 2706499) Evidence E source
  Small or thin slice 86 g, medium slice 108 g, large slice 144 g, 1 cup 140 g, quantity not specified 84 g
• In a national Canadian survey of 20,176 people, cooked lean ground beef was the most often eaten red meat dish. — 20,176 Canadians aged 1 year and older, Canadian Community Health Survey-Nutrition 2015 (n = 20176) Evidence C source
  Ground beef ranked first among 265 red and processed meat food codes by frequency

What your body absorbs

• In young women, adding 3 oz of beef a day raised iron balance over a vegetarian diet, and 6 or 9 oz added little more. — Young adult women over 28 days: 7-day vegetarian lead-in, then three randomly ordered 7-day periods with 3, 6 or 9 oz beef Evidence B source
  Iron balance significantly higher with beef diets; iron bioavailability rose with beef amount; little extra gain above 3 oz a day

What cooking and storage change

• Pan frying took nearly 41% of the fat out of 24% fat ground beef patties, while 5% fat patties lost no detectable fat. — Ground beef patties, 24% and 5% fat, analyzed in the laboratory raw and after pan frying Evidence D source
  High-fat patties lost nearly 41% of fat on frying; low-fat patties lost none detectable
• Across 12 studies, the highest intake of PhIP, a heterocyclic amine formed in well-done meat, went with 20% higher odds of colorectal adenoma (OR 1.20, 95% CI 1.12 to 1.29). — Twelve observational studies of heterocyclic amine intake and colorectal adenoma (n = 12 studies) Evidence C source
  PhIP OR 1.20 (1.12-1.29); MeIQx OR 1.20 (1.08-1.34); DiMeIQx OR 1.16 (1.05-1.27); dose-response significant for PhIP and MeIQx
• US modeling put pan-fried meats as the largest source of heterocyclic amines, with children up to 15 eating about 25% more of them per kg than adults. — More than 25,000 people in the US Continuing Survey of Food Intakes by Individuals (n = 25000) Evidence C source
  Average total HA about 9 ng/kg/day; children 0-15 about 25% higher than adults 16+

What it does to your health

• Five 115 g ground beef patties a week for 5 weeks, at 24% or 5% fat, lowered both HDL and LDL cholesterol in 25 men. — 25 men, mean age 40 years and BMI 31.2, randomized crossover with a 4-week washout (n = 25) Evidence B source
  HDL-C decreased (p = 0.001) and LDL-C decreased (p = 0.011) with both patty types; small dense LDL subfractions decreased
• In 12 older men and postmenopausal women, five ground beef patties a week at 18% or 25% fat for 5 weeks raised plasma palmitic acid and the larger LDL fractions. — Older men (n = 5, about 68 years) and postmenopausal women (n = 7, about 61 years), randomized crossover with 4-week washout (n = 12) Evidence B source
  Palmitic acid up, arachidonic, EPA and DHA down, VLDL-C down, LDL-I-C and LDL-II-C up (all p < 0.05)

Safety, limits and interactions

• Ground beef caused 17 of the 38 beef-linked Salmonella outbreaks reported to CDC in 2002 to 2011. — Salmonella outbreaks with an implicated food vehicle reported to CDC, United States, 1973-2011 (n = 96 beef outbreaks) Evidence C source
  Ground beef implicated in 17 (45%) of 38 beef-attributed outbreaks in 2002-2011
• Salmonella sits in 10.8% of bovine deep lymph nodes, which end up in trimmings used for ground beef, so contamination can be inside the mince and not only on the surface. — 33 studies of Salmonella in bovine deep tissue lymph nodes (n = 33 studies) Evidence C source
  Pooled prevalence 10.8% (95% CI 7.5-14.5); 13.5% in feedlot cattle, 10.7% in warm season
• USDA FSIS says to cook meat loaf, meatballs and hamburgers to a safe minimum internal temperature of 160 °F (71 °C) to be sure all bacteria are destroyed. — consumers cooking ground beef dishes, USA Evidence E source
  160 °F internal temperature

Who this works differently for

• Pooling 20 consumer surveys, men reported eating more raw or undercooked food and handling it less safely than women. — 20 studies of consumer food handling knowledge and practices (n = 20 studies) Evidence C source
  Men worse than women on raw or undercooked food, hygiene, cross-contamination and defrosting

What is still unknown

• Pooling 19 cohorts, fresh red meat showed no clear link to prostate cancer (SRRE 1.06, 95% CI 0.97 to 1.16), and neither did meat cooking methods or heterocyclic amines. — 26 publications from 19 prospective cohort studies (n = 19 cohorts) Evidence C source
  Fresh red meat SRRE 1.06 (0.97-1.16); processed meat 1.05 (1.01-1.10); no significant estimate for cooking methods, HCA or heme iron

The bottom line

The same UK entry lists 12.7 g of carbohydrate from the binder and 154 mg of sodium per 3.5 oz (100 g). US diet surveys weigh a medium slice of beef meat loaf at 108 g and a large one at 144 g. Ground beef was the red meat dish Canadians ate most often in a national survey of 20,176 people. Beef iron is well used. In young women coming off a vegetarian week, adding 3 oz of beef a day raised iron balance, and 6 or 9 oz added little more. The abstract does not say how many women took part. Cooking changes the fat and the crust. Pan frying took nearly 41% of the fat out of 24% fat patties and no detectable fat out of 5% fat ones. A loaf baked in a tin keeps its drippings unless you pour them off, and nobody has measured that loss. Well-done meat forms heterocyclic amines. Across 12 observational studies, the highest intake of one of them, PhIP, went with odds of colorectal adenoma 1.20 times higher (95% CI 1.12 to 1.29), an association and not a measured effect. A US model from 1990s survey data put pan-fried meat as the largest source and children up to 15 at about 25% more per kg than adults. For prostate cancer, 19 cohorts found no clear link with fresh red meat (1.06, 95% CI 0.97 to 1.16), and none with cooking method or these amines. Who should take care. Salmonella is the known hazard of minced beef. Ground beef was the vehicle in 17 of the 38 beef-linked Salmonella outbreaks reported to the CDC in 2002 to 2011. Across 33 studies, 10.8% of the deep lymph nodes that end up in beef trimmings carried Salmonella (95% CI 7.5 to 14.5), so bacteria can sit inside the mince and not only on its surface. That is why the center of a loaf matters. USDA FSIS puts the safe minimum internal temperature for meat loaf, meatballs and hamburgers at 160 °F (71 °C), the point at which it says all bacteria are destroyed. The test of a done loaf is that reading at its center on a food thermometer. In 20 consumer surveys men reported eating more raw or undercooked food than women. We have no card on meat loaf in pregnancy, food allergy or with medicines. A loaf is bound with bread or crumbs and often egg, so check the recipe if you avoid wheat or egg.

Sources

1. mlf-r2-01 · food composition dataset
   Meat loaf, homemade (19-605): Energy 213 kcal, Protein 16.6 g, Fat 10.9 g, Satd FA 4.01 g, Carbohydrate 12.7 g, Iron 1.83 mg, Zinc 2.5 mg, Sodium 154 mg per 100 g
   CoFID 2021, Public Health England, OGL v3.0, code 19-605 · checked 2026-09-29
2. mlf-r2-02 · portion dataset
   Meat loaf made with beef (FNDDS 27214100, fdc_id 2706499): 1 small or thin slice 86 g, 1 medium slice 108 g, 1 large slice 144 g, 1 cup 140 g, Quantity not specified 84 g
   USDA FNDDS 2021-2023, FDC 2706499 · checked 2026-09-29
3. mlf-r2-13 · cross-sectional survey
   A total of 20,176 Canadian individuals aged ≥1 year were included in our analysis. ... The most frequently consumed red/processed meat dish in Canada was "Cooked regular, lean or extra lean ground beef or patty".
   Nutrients, 2022 · checked 2026-09-29
4. mlf-r2-06 · randomized metabolic balance trial
   During the experimental periods, the diets contained 3, 6, or 9 oz of beef, supplying varying levels of zinc and iron. ... Consumption of all diets resulted in a positive iron balance; however, mean iron balances were significantly higher for diets containing beef. As the amount of beef in the diet increased, the bioavailability of iron increased. ... Results of this study also suggest that little increase in zinc and iron utilization is realized by including more than 3 oz beef per day in the diet.
   J Am Diet Assoc, 1992 · checked 2026-09-29
5. mlf-r2-03 · food composition analysis
   The LF patties did not lose a detectable amount of fat following pan frying, but the HF patties lost nearly 41% fat after frying.
   Nutrients, 2023 · checked 2026-09-29
6. mlf-r2-07 · meta-analysis of observational studies
   Twelve studies on HCA intake and risk of CRA were included in our analysis. We observed a statistically significant association when comparing top versus bottom intake category of 2-amino-1-methyl-6-phenylimidazo[4,5-b]pyridine [PhIP; OR = 1.20; 95% confidence interval (CI) = 1.12-1.29], 2-amino-3,8-dimethylimidazo[4,5-f]quinoxaline (MeIQx; OR = 1.20; 95% CI = 1.08-1.34)
   Cancer Epidemiol Biomarkers Prev, 2019 · checked 2026-09-29
7. mlf-r2-11 · dietary exposure assessment
   This method was applied in the present study to U.S. national Continuing Survey of Food Intakes by Individuals (CSFII) data on meats consumed and cooking methods used by >25,000 people ... Pan-fried meats were the largest source of HA in the diet and chicken the largest source of HAs among different meat types. Estimated total HA intakes by male vs. female children were generally similar, with those by (0- to 15-year-old) children approximately 25% greater than those by (16+-year-old) adults.
   J Expo Anal Environ Epidemiol, 2001 · checked 2026-09-29
8. mlf-r2-04 · randomized crossover trial
   In a randomized 2-period crossover, controlled feeding trial, 25 men (mean age and body mass index, 40 years and 31.2) consumed 115-g HF or LF patties, 5/week for 5 weeks with a 4-week washout. ... The HF and LF treatments decreased the plasma concentrations of HDL-C (p = 0.001) and LDL-C (p = 0.011).
   Nutrients, 2023 · checked 2026-09-29
9. mlf-r2-05 · randomized crossover trial
   Older men (n = 5, age 68.0 ± 4.6 years) and postmenopausal women (n = 7, age 60.9 ± 3.1 years) were assigned randomly to consume ground-beef containing 18% total fat (18F) or 25% total fat (25F), five patties per week for 5 weeks with an intervening 4-week washout period. ... The ground-beefs 18F and 25F increased the plasma concentration of palmitic acid (p < 0.05) and decreased the plasma concentrations of arachidonic, eicosapentaenoic, and docosahexaenic acids (p < 0.05). The interventions of 18F and 25F ground-beef decreased very low-density lipoprotein C concentrations and increased particle diameters and low-density lipoprotein (LDL)-I-C and LDL-II-C concentrations (p < 0.05).
   Lipids, 2018 · checked 2026-09-29
10. mlf-r2-09 · outbreak surveillance analysis
    During 1973-2011, of the 1965 outbreaks of Salmonella where a food vehicle was implicated, 96 were attributed to beef, accounting for 3684 illnesses. ... Ground beef emerged as an important vehicle in the 2000s; it was implicated in 17 (45%) of the 38 beef-attributed outbreaks reported during 2002-2011.
    Epidemiol Infect, 2015 · checked 2026-09-29
11. mlf-r2-10 · meta-analysis of prevalence studies
    Bovine deep tissue lymph nodes (DTLNs) are retained in bench trimmings during carcass fabrication and enter the ground beef supply, making Salmonella contamination in DTLNs a recognized food safety concern. ... Of 490 records initially retrieved from two bibliographic databases and grey literature, 33 were identified as relevant and included in meta-analyses. The pooled Salmonella prevalence in DTLNs was 10.8% (95% CI [7.5, 14.5]), with significant heterogeneity between studies.
    Int J Food Microbiol, 2026 · checked 2026-09-29
12. sf-fsis3-11 · agency advice
    To be sure all bacteria are destroyed, cook meat loaf, meatballs and hamburgers to a safe minimum internal temperature of 160 degrees F.
    USDA FSIS, Ground Beef and Food Safety · checked 2026-10-08
13. mlf-r2-12 · meta-analysis of surveys
    We combined findings from 20 studies using meta-analysis methods to estimate percentages of consumers engaging in risky behaviors, such as consumption of raw food, poor hygiene, and cross-contamination, separated by various demographic categories. ... For example, compared with women, men reported greater consumption of raw or undercooked foods, poorer hygiene, poorer practices to prevent cross-contamination, and less safe defrosting practices.
    J Food Prot, 2005 · checked 2026-09-29
14. mlf-r2-08 · meta-analysis of cohort studies
    A comprehensive literature search was performed and 26 publications from 19 different cohort studies were included. ... The SRREs for total prostate cancer and total red meat consumption, fresh red meat consumption, and processed meat consumption were 1.02 (95% CI: 0.92-1.12), 1.06 (95% CI: 0.97-1.16), and 1.05 (95% CI: 1.01-1.10), respectively. ... No significant SRREs were observed for any of the meat cooking methods, HCA, or heme iron analyses.
    Nutr J, 2015 · checked 2026-09-29