Eggs vs peanut butter: the firmest evidence is about babies

The strongest finding for this pair concerns infants. By a meta-analysis of randomized trials, introducing allergenic foods before 12 months cut egg allergy risk by 42 percent (RR 0.58, 95% CI 0.44 to 0.78, 8 trials, 5193 infants). Peanut allergy risk fell by 69 percent (RR 0.31, 95% CI 0.17 to 0.54, 3 trials, 4183 infants). Early introduction means a form safe for the age, which is neither a spoon of thick paste nor raw egg, and babies with severe eczema start under a doctor. A second meta-analysis of 6 trials in 3032 infants found egg at 3 to 6 months lowered egg allergy by 40 percent, about 37 fewer cases per 1000 where 9.3 percent would otherwise develop it, on low to moderate evidence. Eating more of both in pregnancy did not help. In a trial of 2137 pregnant women at high allergy risk, mothers ate at least 6 eggs and 60 peanuts a week through pregnancy and breastfeeding. Infant egg or peanut allergy was 7.8 percent against 8.4 percent (RR 0.93, 95% CI 0.69 to 1.26), in a single trial.

How much is actually in it

• Per 100 g, a boiled egg has 143 calories, 12.4 g protein, 9.96 g fat and 411 mg cholesterol, while peanut butter has 598 calories, 22.21 g protein, 51.36 g fat and no cholesterol. — Egg, whole, boiled or poached and Peanut butter as coded in FNDDS 2021-2023 Evidence E source
  Energy 143 vs 598 calories; protein 12.4 vs 22.21 g; fat 9.96 vs 51.36 g; saturated fat 3.2 vs 10.3 g; cholesterol 411 vs 0 mg

What a real portion looks like

• One egg (50 g) gives about 72 calories and 6.2 g protein, while the usual 1.1 oz (32 g) of peanut butter on a sandwich gives about 191 calories and 7.1 g protein, so protein is similar but energy is almost three times higher. — household measures in FNDDS 2021-2023 Evidence E source
  1 egg 50 g: 71.5 calories, 6.2 g protein, 206 mg cholesterol; peanut butter 32 g: 191 calories, 7.1 g protein, 16.4 g fat; 1 tablespoon 16 g

What your body absorbs

• In a randomized crossover trial in 15 obese women, adding 1.5 oz (42.5 g) of peanut butter to breakfast lowered the glucose rise after lunch and reduced desire to eat, while whole peanuts had similar but non-significant effects. — 15 obese women at high type 2 diabetes risk, 42.5 g whole peanuts or peanut butter or none added to a 75 g carbohydrate breakfast (n = 15) Evidence B source
  Lower second-meal glucose IAUC and NEFA with peanut butter vs control; higher PYY, GLP-1, CCK; whole peanuts not significant

What cooking and storage change

• Cooking eggs matters for protein uptake: in 10 healthy volunteers, 35% of raw egg protein escaped digestion in the small intestine against under 6% of cooked egg protein. — 10 healthy volunteers, 25 g labeled egg protein eaten once cooked and once raw (n = 10) Evidence C source
  Malabsorbed 5.73% (cooked) vs 35.10% (raw), P < 0.005
• Grinding matters for peanuts: in a randomized crossover trial in 13 adults, ground roasted peanuts gave a lower 2-hour glucose response than raw peanuts with skin. — 13 healthy adults (4 men, 9 women), test meals of equal nutrient composition (n = 13) Evidence B source
  Glycemic AUC lower after ground-roasted skinless peanuts than raw peanuts with skin (p = 0.02); no difference in later energy intake

What it does to your health

• In a 6-month randomized trial in 120 adults aged 65 and over at risk of falls, 1.5 oz (43 g) of peanut butter a day did not improve gait speed, the primary outcome, or grip strength, but cut five-times sit-to-stand time by 1.23 s. — 120 community-dwelling adults aged 65 or older at risk of falls, peanut butter 43 g/day vs usual care for 6 months (n = 120) Evidence B source
  5STS time -1.23 s (95% CI -2.09 to -0.37); absolute power +22.0 W (95% CI 7.1 to 36.9); no effect on gait speed, grip, lean mass
• A higher-quality egg breakfast was not clearly more filling than a cereal breakfast with equal protein: in two crossover trials in 30 women losing weight, it raised fullness in one experiment but not lunch intake. — 30 otherwise healthy women with overweight or obesity on a reduced-calorie diet, two 2-week randomized crossover trials (n = 30) Evidence B source
  Experiment 1 no differences; Experiment 2 fullness higher after egg breakfast (p = 0.038), lunch energy intake not different

Safety, limits and interactions

• By a meta-analysis of randomized trials, introducing allergenic foods before 12 months cut egg allergy risk by 42% (8 trials, 5193 infants) and peanut allergy risk by 69% (3 trials, 4183 infants). — infants in 12 randomized trials of allergenic food introduction before 12 months of age (n = 5193 and 4183) Evidence A source
  Egg allergy RR 0.58 (95% CI 0.44 to 0.78); peanut allergy RR 0.31 (95% CI 0.17 to 0.54); high to moderate certainty

What people believe that the data does not support

• In a randomized trial of 2137 pregnant women at high allergy risk, eating at least 6 eggs and 60 peanuts a week through pregnancy and lactation did not lower infant egg or peanut allergy at one year: 7.8% vs 8.4%. — pregnant women whose unborn child had at least two family members with allergic disease, from before 23 weeks' gestation to 4 months of lactation (n = 2137) Evidence B source
  IgE-mediated egg or peanut allergy 7.8% vs 8.4%, RR 0.93 (95% CI 0.69 to 1.26), P = 0.65; safety similar
• The EU refused the claim that about 1.1 oz (30 g) of peanut butter a day, as part of a diet low in saturated fat, helps achieve healthy cholesterol levels and promotes heart health. — EU consumers, claim on peanuts, peanut butter and peanut oil Evidence E source
  Status non-authorized
• US food labeling rules for the implied claim healthy list eggs and nuts among the protein foods an individual food can be made of. — foods labeled healthy in the United States Evidence E source
  Eggs and nuts named as qualifying protein food groups

Who this works differently for

• By a meta-analysis of 6 randomized trials in 3032 infants, introducing egg at 3 to 6 months lowered egg allergy risk by 40%, about 37 fewer cases per 1000 where 9.3% would otherwise develop it. — 3032 infants in 6 randomized trials, egg introduced at 3 to 6 months vs no early introduction (n = 3032) Evidence A source
  RR 0.60 (95% CI 0.44-0.82); 37 fewer cases per 1000 (95% CI 17-52); low to moderate evidence

What is still unknown

• An umbrella review of 14 meta-analyses rated the evidence on eggs and health as critically low in quality, finding no link between high egg intake and cardiovascular outcomes or all-cause mortality. — 14 meta-analyses (10 of observational, 4 of intervention studies) published since 2020 Evidence C source
  LDL cholesterol WMD 7.39 (95% CI 5.82-8.95) and heart failure RR 1.15 (1.02-1.30), both very weak evidence; no association with CVD outcomes or all-cause mortality

The bottom line

For adults the two differ mainly in energy. One 50 g egg works out at about 72 calories and 6.2 g protein, while the 1.1 oz (32 g) of peanut butter the database assigns to a sandwich gives about 191 calories and 7.1 g protein, both calculated from the 100 g values. The egg carries 411 mg cholesterol per 3.5 oz (100 g) and peanut butter none. An umbrella review of 14 meta-analyses found no link between high egg intake and cardiovascular outcomes or death from any cause, and rated the whole evidence base as critically low in quality. The same review listed weak associations with heart failure (RR 1.15, 95% CI 1.02 to 1.30) and higher LDL cholesterol, on very weak evidence. Preparation matters for both. In 10 healthy volunteers, 35 percent of raw egg protein escaped digestion in the small intestine against under 6 percent of cooked egg protein, in a small study whose order was not randomized. In a randomized crossover trial in 13 adults, ground roasted skinless peanuts gave a lower 2 hour glucose response than raw peanuts with skin, a close relative of the paste without its added salt and oil. In 15 obese women at high risk of type 2 diabetes, 42.5 g of peanut butter added to breakfast moderated blood glucose after the next meal and reduced the desire to eat, and whole peanuts did not reach significance. Two trials looked for more. In 120 adults aged 65 and over at risk of falls, 1.5 oz (43 g) of peanut butter a day for 6 months did not improve gait speed, the main outcome. The five-times sit-to-stand test got 1.23 s faster (95% CI 0.37 to 2.09 s faster), a secondary result against usual care with no placebo food. In 30 women with overweight or obesity on a reduced-calorie diet, an egg breakfast raised fullness in one of two experiments against a cereal breakfast with the same protein, and lunch intake did not change. The EU refused a claim that about 1.1 oz (30 g) of peanut butter a day helps achieve healthy cholesterol, which means the evidence fell short when it was assessed. Allergy is the caution on this page, and every card we have is about preventing it in infants. We found no card on eating either food once an egg or peanut allergy already exists.

Sources

1. exp-r6-12 · reference dataset
   Egg, whole, boiled or poached (fdc 2707154): Energy 143 KCAL, Protein 12.4 G, Total lipid 9.96 G, Saturated 3.2 G, Cholesterol 411 MG | Peanut butter (fdc 2707537): Energy 598 KCAL, Protein 22.21 G, Total lipid 51.36 G, Saturated 10.325 G, Cholesterol 0 MG, per 100 g
   USDA FNDDS 2021-2023, Egg whole boiled or poached 31103010 and Peanut butter 42202000 · checked 2026-09-29
2. exp-r6-13 · reference dataset
   Egg, whole, boiled or poached: 1 egg 50 g, 1 cup 135 g | Peanut butter: 1 tablespoon 16 g, guideline amount per sandwich 32 g, 1 single serving 45 g
   USDA FNDDS 2021-2023, Egg whole boiled or poached 31103010 and Peanut butter 42202000 · checked 2026-09-29
3. exp-r6-05 · randomized crossover trial
   The addition of PB to breakfast moderated postprandial glucose and NEFA concentrations, enhanced gut satiety hormone secretion and reduced the desire to eat. The greater bioaccessibility of the lipid component in PB is probably responsible for the observed incremental post-ingestive responses between the nut forms.
   Br J Nutr, 2013 · checked 2026-09-29
4. exp-r6-04 · controlled clinical trial
   Amounts of 5.73% and 35.10% (P < 0.005) of cooked and raw test meal, respectively, escaped digestion and absorption in the small intestine.
   Am J Physiol, 1999 · checked 2026-09-29
5. exp-r6-06 · randomized crossover trial
   The area under the glycemic response curve after GRPWS was lower (p = 0.02) the one obtained for RPS. There was no treatment effect on energy intake, macronutrients and fiber consumption after the test meal.
   Nutr Hosp, 2011 · checked 2026-09-29
6. exp-r6-07 · randomized controlled trial
   At 6 months, there were no significant treatment effects on the primary outcome of gait speed or other measures of physical function (p > 0.05), with the exception that 5STS time and muscle power improved significantly more in the peanut butter compared to control group (estimated treatment effect: time, -1.23 s [95% CI, -2.09, -0.37], p = 0.006; absolute power, 22.0 W [95% CI: 7.1 to 36.9], p = 0.004; relative power, 0.27 W/kg [95% CI: 0.10 to 0.45], p = 0.002).
   J Cachexia Sarcopenia Muscle, 2026 · checked 2026-09-29
7. exp-r6-08 · randomized crossover trial
   Following the breakfasts, Experiment-1 showed no significant differences in outcome variables. In Experiment-2, the egg-breakfast increased fullness (p = 0.038), but lunch-time energy intake was not different.
   Int J Food Sci Nutr, 2022 · checked 2026-09-29
8. exp-r6-01 · meta-analysis of randomized trials
   We found high to moderate certainty evidence suggested that early introduction of allergen-containing foods reduces the risk of multiple food allergies (4 RCTs, 3854 participants, RR 0.49, 95% CI 0.33 to 0.74), egg (8 RCTs, 5193 participants, RR 0.58, 95% CI 0.44 to 0.78), peanut (3 RCTs, 4183 participants, RR 0.31, 95% CI 0.17 to 0.54)
   BMJ Evid Based Med, 2024 · checked 2026-09-29
9. exp-r6-03 · randomized controlled trial
   There was no significant difference in the percentage of infants with IgE-mediated egg or peanut allergy between the maternal high egg-peanut group (83 of 1066, 7.8%) and the standard-diet group (89 of 1064, 8.4%) (relative risk, 0.93; 95% confidence interval, 0.69 to 1.26; P = 0.65).
   N Engl J Med, 2026 · checked 2026-09-29
10. exp-r6-10 · regulatory register
    POL-HC-7733 Peanuts, Peanut butter, Peanut oil Consuming a small handful, about 30 grams, of peanuts a day as part of a diet low in saturated fat helps to achieve healthy cholesterol levels and promotes heart health. Consuming two tablespoons, about 30g, of peanut butter a day as part of a diet low in saturated fat helps to achieve healthy cholesterol levels and promotes heart health. Consuming two tablespoons, about 30 grams of peanut oil a day as part of a diet low in saturated fat helps to achieve healthy cholesterol levels and promotes heart health. Non-authorised
    EU Register on nutrition and health claims, claim POL-HC-7733, snapshot 2026-09-21 · checked 2026-09-29
11. exp-r6-11 · regulation
    (E) Lean meat, seafood, eggs, beans, peas, lentils, nuts, or seeds.
    21 CFR 101.65, Implied nutrient content claims and related label statements · checked 2026-09-29
12. exp-r6-02 · meta-analysis of randomized trials
    A low to moderate level of evidence showed a benefit of the early introduction of egg (relative risk, RR 0.60, 95% CI 0.44-0.82, p = 0.002, mild heterogeneity, I2 = 23%). The absolute risk reduction for a population with an incidence of egg allergy of 9.3% was 37 fewer cases (95% CI 17-52) per 1,000 people.
    Int Arch Allergy Immunol, 2018 · checked 2026-09-29
13. exp-r6-09 · umbrella review
    The level of evidence was very weak for all the significant associations: risk of heart failure (RR 1.15; 95%CI: 1.02-1.30), cancer mortality (RR 1.13; 95%CI 1.06-1.20), higher levels of LDL cholesterol (WMD 7.39; 95%CI 5.82-8.95) ... No evidence of association was found among all cardiovascular outcomes and all-cause mortality risk between high vs. low egg consumption.
    Nutr Metab Cardiovasc Dis, 2025 · checked 2026-09-29