Hamburger: one meal, measured for hours

Almost every trial behind this page is a single meal, followed for a few hours afterwards. None of the studies behind this page fed people burgers for months and then counted heart attacks or weight gain. Within those few hours the results do not all point the same way. In 50 adults with type 2 diabetes and 50 without, a processed hamburger meal raised blood fats more than a vegan meal with the same calories, in both groups, and kept insulin high for 3 hours in the people with diabetes. When 25 adults ate a hamburger with bacon and cola on one day and a salmon burger on sourdough rye with salad and orange juice on another, the salmon meal gave a 44 percent smaller rise in blood sugar and insulin. Then the Hamburg Burger Trial put 24 adults through three meals and found no difference between them. Flow-mediated dilation is a measure of how well an artery widens when more blood rushes through it. It fell over 4 hours after a beef burger with fries and soda, and it fell just as much after a vegetarian burger, even one served with salad, fruit and yogurt. Each of these trials tested a whole fast-food meal, sides and drink included, on one afternoon. What a burger habit does to you over years is a question our evidence cannot answer yet.

How much is actually in it

• Per 100 g, the British takeaway hamburger in CoFID has 480 mg of sodium and 246 kcal, while the generic US hamburger in FNDDS has 355 mg of sodium, a 35% gap between two national tables for the same dish. — composition tables, UK and US Evidence E source
  Sodium 480 mg (CoFID 19-544) versus 355 mg (FNDDS 27510521) per 100 g

What a real portion looks like

• A generic US hamburger weighs 145 g in FNDDS and carries about 515 mg of sodium, while a McDonald's hamburger is listed at 100 g, so one hamburger can mean servings that differ by almost half. — US household portions, FNDDS Evidence E source
  1 hamburger NFS 145 g, sodium 514.8 mg per item; 1 McDonald's hamburger 100 g

What your body absorbs

• In young pigs, zinc from cooked ground beef was retained at about 70%, the same as from a zinc salt, compared with 30% from soy protein at the same zinc dose. — 104 weaned pigs in 4 trials, 13 diets (n = 104) Evidence D source
  About 70% zinc retained from ground beef or zinc carbonate versus 30% from soybean protein (P ≤ 0.05)

What cooking and storage change

• A meta-analysis of 12 observational studies found that people in the highest intake category of PhIP, a heterocyclic amine formed when meat is cooked at high heat, had 20% higher odds of colorectal adenoma than those in the lowest. — 12 observational studies of dietary heterocyclic amine intake and colorectal adenoma (n = 12 studies) Evidence C source
  PhIP OR 1.20 (95% CI 1.12-1.29), MeIQx OR 1.20 (1.08-1.34), with a dose-response for both
• CDC and USDA advise home cooks to cook ground beef to 160°F (71°C), a temperature that CDC says kills E. coli germs rapidly, while the FDA Food Code lets restaurants use 155°F held for 17 seconds. — consumers and restaurants in the United States Evidence E source
  Consumer target 160°F; restaurant standard 155°F for 17 seconds

What it does to your health

• In a pilot crossover trial in 11 healthy adults, a 250 g hamburger patty narrowed blood vessels two hours after eating, and adding 68 g of avocado to the same patty prevented that change. — 11 healthy volunteers, two single test meals (n = 11) Evidence B source
  PAT index fell from 2.19 to 1.56 after the patty alone (p = 0.0007) and did not change with avocado (2.17 to 2.08, p = 0.68)
• In a randomised crossover trial in 25 adults, a salmon burger on sourdough rye with salad and orange juice produced a 44% smaller rise in blood glucose and insulin than a hamburger with bacon and cola matched for energy. — 25 healthy normal-weight and overweight adults aged 21-39, single test meals (n = 25) Evidence B source
  Postprandial glucose and insulin increases 44% lower after the alternative meal (P<0.001 and P = 0.003)
• In a 5-week controlled feeding trial in 25 men with overweight or obesity (mean BMI 31.2), five 115 g patties a week of 24% fat ground beef lowered both HDL and LDL cholesterol despite the extra saturated fat, and both the 24% and the 5% fat beef reduced the smaller, denser LDL particles, so the fattier patty did not raise LDL in this short test. — 25 men, mean age 40, mean BMI 31.2, crossover with 5 weeks per diet and a 4-week washout (n = 25) Evidence B source
  High-fat patties decreased HDL-C and LDL-C; both treatments decreased smaller, denser LDL subfractions

Safety, limits and interactions

• Across 33 studies, the pooled prevalence of Salmonella in cattle deep lymph nodes, which end up in trimmings used for ground beef, was 10.8%, a figure for the raw material rather than for finished burgers, and in a subgroup analysis it was higher in the warm season (10.7%) than in the cool season (3.8%). — 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)

What people believe that the data does not support

• In the Hamburg Burger Trial of 24 healthy adults, a beef burger with fries and soda lowered artery dilation over 4 hours just as much as a vegetarian burger with fries or with salad, fruit and yogurt (P = 0.677 for meal type). — 24 healthy volunteers, three single fast-food meals (n = 24) Evidence B source
  Flow-mediated dilation fell after all three meals, from about 9% to about 6-7% at 4 hours; no difference between meals

Who this works differently for

• In a randomised crossover trial in men with type 2 diabetes, 18 of whom finished, cooking the burger with a polyphenol-rich spice mix cut urinary malondialdehyde, a marker of oxidative damage, by 31% and improved blood vessel response two hours after the meal compared with a salt-only burger. — 22 men with type 2 diabetes, 18 completed, single test meals (n = 18) Evidence B source
  Urinary malondialdehyde 31% lower (P < 0.001); peripheral arterial tonometry score -9.7% after control versus +18.0% after spice burger (P = 0.025)
• In a randomised crossover trial in 50 people with type 2 diabetes and 50 healthy controls, a processed hamburger meal raised blood lipids more than a vegan meal of equal calories in both groups and kept insulin high for 3 hours in those with diabetes. — 50 adults with type 2 diabetes and 50 healthy controls, two 3-hour meal tests (n = 100) Evidence B source
  Larger postprandial rise in lipids after the meat meal in both groups (p<0.001); persistent hyperinsulinaemia in diabetes (p<0.001)

The bottom line

Start with the size of the thing, because nobody agrees on it. A generic American hamburger weighs 145 g in the US food survey tables and carries about 515 mg of sodium. A McDonald's hamburger is listed at 100 g. Per 100 g, a British takeaway burger has 480 mg of sodium and a generic American one 355 mg, a 35 percent gap for what is supposedly the same dish. So a number quoted for "a burger" tells you little until you know whose burger. Cook ground beef all the way through. CDC and USDA tell home cooks to reach 160°F (71°C) inside the patty, while restaurants may use 155°F held for 17 seconds. The reason is in how mince is made. Across 33 studies, Salmonella turned up in 10.8 percent of the deep lymph nodes of cattle, small glands that stay in the trimmings ground into beef, and a subgroup analysis found it commoner in the warm season than in the cool one. That figure is for the raw material, the lymph nodes, and it does not mean that one burger in ten carries Salmonella. CDC adds that cooking ground beef to 160°F kills E. coli germs rapidly. Cooking hot has a cost that is less certain. PhIP is one of the heterocyclic amines, compounds that form when meat is cooked at high heat. In a meta-analysis of 12 observational studies, people with the highest PhIP intake had 20 percent higher odds of colorectal adenoma, a benign growth in the bowel that can later turn into cancer. Those studies covered meat in general rather than burgers, and observational data like this shows a link without proving that the meat caused it. A few small trials tried changing the burger itself, and each is too small to build a habit on. In 11 healthy adults, a 250 g patty narrowed blood vessels two hours later and adding 68 g of avocado to the same patty prevented it. That was a pilot with one meal each. In 18 men with type 2 diabetes who finished the trial, a burger cooked with a spice mix rich in polyphenols (plant compounds found in herbs and spices) cut a urine marker of oxidative damage by 31 percent. It also improved the vessel response two hours later, compared with a burger seasoned only with salt. In 25 men with overweight or obesity (mean BMI 31.2), five 115 g patties a week of 24 percent fat beef for five weeks did not raise LDL cholesterol. The fatty patties lowered both LDL and HDL despite the extra saturated fat, and both kinds of beef reduced the smaller, denser LDL particles. Five weeks in 25 men is a short look. The one finding about how well the body takes up nutrients from burger meat comes from young pigs: they kept about 70 percent of the zinc in cooked ground beef against 30 percent from soy protein. That is a hint from animals, and our cards hold no measurement of it in people. Who should be careful is the thinnest part of this page. The strongest signal in our cards is for people with type 2 diabetes, whose insulin stayed high for hours after a processed hamburger meal. Beyond that we hold no evidence at all on pregnancy, young children, older adults, kidney disease or interactions with medicines, and hamburger meat is too broad a food for us to fill that gap by guessing. If one of those applies to you, the undercooked patty is the one risk here with a clear rule behind it.

Sources

1. hamb-b4-11 · reference dataset
   CoFID 19-544 Burger, hamburger, takeaway · per 100 g: Energy 246 kcal · Protein 13.5 g · Fat 8.3 g · Satd FA 3.50 g · Sodium 480 mg · Iron 1.20 mg · Zinc 3.0 mg || FNDDS 27510521 Hamburger, NFS (fdc 2706920) · Sodium, Na 355 mg per 100 g
   CoFID 2021, Public Health England / OGL v3.0, and USDA FNDDS (Hamburger, NFS, food code 27510521) · checked 2026-09-23
2. hamb-b4-12 · reference dataset
   FNDDS 27510521 Hamburger, NFS · 1 hamburger 145 g · Sodium, Na 514.8 mg per hamburger || FNDDS 27510553 Hamburger (McDonalds) · 1 hamburger 100 g
   USDA FNDDS, Hamburger NFS, food code 27510521 · checked 2026-09-23
3. hamb-b4-07 · animal study
   Pigs fed the diets with 9 mg Zn/kg from GB or ZnCO(3) were not different in Zn availability and retained about 70% Zn (apparent balance and (65)Zn) compared with 30% (P ≤ 0.05) for pigs fed the diet with 9 mg Zn/kg from SP.
   J Anim Sci, 2014 · checked 2026-09-23
4. hamb-b4-08 · meta-analysis of observational studies
   Heterocyclic amines (HCA) are potent carcinogenic substances formed in meat. ... Twelve studies on HCA intake and risk of CRA were included in our analysis. ... [PhIP; OR = 1.20; 95% confidence interval (CI) = 1.12-1.29]
   Cancer Epidemiol Biomarkers Prev, 2019 · checked 2026-09-23
5. hamb-b4-10 · agency guidance
   The Food and Drug Administration Food Code says that restaurants should cook ground beef to 155°F for 17 seconds. But CDC and the U.S. Department of Agriculture say that consumers should cook ground beef to 160°F. ... Cooking ground beef to 160°F kills E. coli germs rapidly.
   CDC, Restaurant Food Safety: Ground Beef Preparation (reviewed 2026-09-09) · checked 2026-09-23
6. hamb-b4-02 · RCT
   Eleven healthy subjects on two separate occasions consumed either a 250 g hamburger patty alone (ca. 436 cal and 25 g fat) or together with 68 grams of avocado flesh ... we observed significant vasoconstriction 2 hours following hamburger ingestion (2.19 ± 0.36 vs. 1.56 ± 0.21, p = 0.0007), which did not occur when the avocado flesh was ingested together with the burger (2.17 ± 0.57 vs. 2.08 ± 0.51, NS p = 0.68).
   Food Funct, 2013 · checked 2026-09-23
7. hamb-b4-05 · RCT
   The conventional fast-food meal was a hamburger meal (hamburger, bacon, cola drink, calculated glycemic load = 48.7), the unconventional fast food was a salmonburger meal (fiber-rich sourdough rye bread, salad with vinegar, orange juice, glycemic load = 46.0). ... Postprandial increases in glucose and insulin were 44% lower after the unconventional meal (P<0.001 and P = 0.003, respectively).
   Eur J Clin Nutr, 2012 · checked 2026-09-23
8. hamb-b4-06 · RCT
   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. ... Contrary to our hypothesis, the HF treatment decreased plasma HDL-C and LDL-C concentrations despite increased saturated fat intake, and both treatments decreased the abundance of smaller, denser LDL subfractions.
   Nutrients, 2023 · checked 2026-09-23
9. hamb-b4-09 · 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 ... The pooled Salmonella prevalence in DTLNs was 10.8% (95% CI [7.5, 14.5]), with significant heterogeneity between studies. Subgroup analyses revealed higher prevalence during the warm season compared to the cool season (10.7% vs. 3.8%)
   Int J Food Microbiol, 2026 · checked 2026-09-23
10. hamb-b4-03 · RCT
    There were significant intraindividual differences for time (P < 0.001) but not for type of meal (P = 0.677). ... Against common expectations, a conventional beef burger meal and presumably healthier alternatives with or without vitamin-rich side orders did not differ significantly in their acute effects on vascular reactivity.
    Am J Clin Nutr, 2007 · checked 2026-09-23
11. hamb-b4-01 · RCT
    Twenty-two subjects consumed burgers cooked with salt only (control burger) or with salt and spice mix (spice burger) in randomized order. ... Urine malondialdehyde excretion in mmol/g creatinine was reduced by 31% (P < 0.001) after consuming the spice burger compared with the control burger.
    Diabet Med, 2013 · checked 2026-09-23
12. hamb-b4-04 · RCT
    In a randomized crossover study, 50 patients suffering from type 2 diabetes (T2D) and 50 healthy subjects underwent two 3-h meal tolerance tests. ... The M-meal resulted in a higher postprandial increase in lipids in both groups (p<0.001) and persistent postprandial hyperinsulinemia in patients with diabetes (p<0.001).
    PLoS One, 2014 · checked 2026-09-23