Peanut butter vs peanuts: mostly salt apart, and early peanut matters for babies

The strongest peanut finding is about babies. A meta-analysis of 3 randomized trials in 4,183 infants found that introducing peanut before 12 months cut the risk of peanut allergy to about a third (RR 0.31, 95% CI 0.17 to 0.54), at high to moderate certainty. The trials did not separate thinned peanut butter from puffs or other forms. Observational data from 190 studies of 2.8 million children point the same way, linking first peanut after 12 months with higher odds of food allergy (OR 2.55). That is an association, and parents may delay peanut in children already at high risk. For infants with severe eczema, egg allergy or both, the 2017 NIAID guidelines recommend peanut food as early as 4 to 6 months but advise strongly considering a blood IgE or skin prick test before the first peanut. In the LEAP trial behind that advice, peanut was started only after a supervised food challenge, and 9.1 percent of screened infants were excluded for a large skin-test reaction. The guidelines also say no whole nuts before age 5 and no peanut butter from a spoon or in lumps before age 4, because of choking. For adults, the jar and the bag differ mainly in salt. USDA sampling put creamy peanut butter at 49.4 g fat and 221 mg sodium per 3.5 oz (100 g), against 43.3 g fat and 1.5 mg sodium in raw peanuts, 8 samples each. The butter sodium ran from 0 to 427 mg because salted and unsalted brands were pooled, and raw peanuts are not the roasted ones most people eat.

How much is actually in it

• USDA sampling found creamy peanut butter averaging 49.4 g fat and 221 mg sodium per 3.5 oz (100 g), against 43.3 g fat and almost no sodium in raw peanuts, so the butter mainly adds salt and some oil. — USDA Foundation Foods samples: Peanut butter, creamy (8 samples) and Peanuts, raw (8 samples) (n = 16 samples) Evidence E source
  Peanut butter fat 49.43 g (33.51-54.24), sodium 220.7 mg (0-427); raw peanuts fat 43.28 g (38.68-48.52), sodium 1.5 mg (0-6.7); protein about 24 vs 23 g

What a real portion looks like

• The US survey counts a peanut butter sandwich as 1.1 oz (32 g) of peanut butter (2 tablespoons) and a serving of peanuts as 1 oz, 28 g, so the usual butter portion is slightly larger. — USDA FNDDS survey foods Peanut butter (fdc 2707537) and Peanuts, roasted, unsalted (fdc 2707516) (n = 2 records) Evidence E source
  Peanut butter: 1 tbsp 16 g, per sandwich 32 g, single serving 1.6 oz (45 g); peanuts: 1 oz 28 g, 1 cup 146 g, 1 peanut 1 g

What your body absorbs

• A systematic review of 21 human and lab studies found the body gets less energy from nuts than labels assume, and more from ground and heated forms, ranking peanut butter above roasted and raw nuts. — 21 human feeding and in vitro digestion studies of tree nuts and peanuts, adults (n = 21 studies) Evidence C source
  Metabolizable energy lower than Atwater prediction for all nut types; ranking by form flour > chopped > whole, by heat butter > roasted > raw
• In 137 Indian women, adding nuts including peanuts to bread cut iron absorption from 6.6% to 1.8%, and 50 mg of vitamin C reversed the effect of peanuts. — 137 women in India, single test meals with radio-iron (n = 137) Evidence C source
  Geometric mean iron absorption 1.8% with nut meals vs 6.6% bread alone; 50 mg ascorbic acid overcame the peanut effect

What cooking and storage change

• A meta-analysis of 19 processing trials, mostly on peanuts, found roasting cut aflatoxin B1 by about 47%, so roasting reduces but does not remove this mold toxin. — 19 interventional food-processing studies on nuts, mostly peanuts (n = 19 trials) Evidence D source
  Roasting: aflatoxin B1 -46.91%, B2 -30.66%, G1 -40.88%, G2 -26.19%; irradiation: B1 -58.60%

What it does to your health

• In a 12-week crossover RCT in 61 older adults, eating high-oleic peanuts for 15-20% of energy raised intake by 853 kJ a day yet did not change body composition, lipids or glucose. — 61 healthy adults, mean age 65, BMI 31, Australia, 12 weeks peanuts vs nut-free diet (n = 61) Evidence B source
  Energy intake +10% (853 kJ/day); no differences in lipids, CRP, glucose, insulin or body composition; weight gain about 1.1 lb (0.5 kg), less than predicted

Safety, limits and interactions

• The NIAID guidelines warn that whole nuts should not be given to children under 5, and peanut butter straight from a spoon or in lumps should not be given to children under 4, because of the choking risk. — infants and young children being given peanut Evidence E source
  No whole nuts under 5 years; no peanut butter from a spoon or in lumps under 4 years
• The CDC lists whole or chopped nuts and spoonfuls or chunks of nut butters such as peanut butter among foods that young children can choke on. — Infants and young children Evidence E source
  Listed as food to avoid for young children (choking risk)
• In LEAP, peanut was started only after a supervised food challenge. Of 319 infants assigned to eat it, 7 reacted at that first challenge and 9 later stopped because of allergic symptoms, and 9.1% of screened infants were excluded for a large skin-test reaction. — infants screened for LEAP; 319 randomly assigned to peanut consumption (n = 834) Evidence B source
  76 of 834 (9.1%) excluded for skin-test wheal over 4 mm; 7 of 319 reacted at the baseline challenge; 9 stopped because of allergic symptoms
• In an analysis of 19 peanut challenge studies with 3,151 people with peanut allergy, 4.5% reacted with anaphylaxis to 5 mg of peanut protein or less. — people with peanut allergy reacting at double-blind placebo-controlled food challenge, 19 studies (n = 3151) Evidence C source
  4.5% (95% CI 1.9% to 10.1%) reacted to 5 mg peanut protein or less with anaphylaxis

What people believe that the data does not support

• The EU rejected the claim that a daily 1.1 oz (30 g) of peanuts or two tablespoons of peanut butter helps achieve healthy cholesterol and heart health. — EU Register on nutrition and health claims, snapshot 2026-09-21 Evidence E source
  Status non-authorized; 0 of 3 peanut claims authorized

Who this works differently for

• For infants with severe eczema, egg allergy or both, the 2017 NIAID guidelines recommend peanut-containing food as early as 4 to 6 months. Before the first peanut, they advise strongly considering a blood IgE or skin prick test to decide whether and how to introduce it. — infants with severe eczema, egg allergy or both (US expert panel guideline) Evidence E source
  Peanut-containing food as early as 4 to 6 months; peanut-specific IgE and/or skin prick test strongly considered before the first peanut
• In the LEAP trial of 640 infants with severe eczema, egg allergy or both, eating peanut cut peanut allergy at age 5 from 13.7% to 1.9% in infants with a negative skin test and from 35.3% to 10.6% in those already mildly sensitized. — infants aged 4 to under 11 months with severe eczema, egg allergy, or both (n = 640) Evidence B source
  Peanut allergy at 60 months: skin-test negative 13.7% avoidance vs 1.9% consumption; skin-test positive (1 to 4 mm) 35.3% vs 10.6%
• A US survey of 40,443 adults estimated that 1.8% have a convincing peanut allergy. Among adults with any food allergy, about half had had a severe reaction and 48% first developed it in adulthood. — US adults surveyed 2015 to 2016 (n = 40443) Evidence C source
  Convincing peanut allergy 1.8% (95% CI 1.7% to 1.9%); among food-allergic adults 51.1% had a severe reaction, 48.0% developed allergy as adults
• A meta-analysis of 3 RCTs with 4,183 infants found early introduction of peanut, before 12 months, cut peanut allergy risk by about 69% (RR 0.31). — infants in randomized trials of allergenic food introduction before 12 months (n = 4183) Evidence A source
  Peanut allergy RR 0.31 (95% CI 0.17 to 0.54); egg RR 0.58; multiple food allergy RR 0.49
• Across 190 studies with 2.8 million children, observational data link first eating peanut after 12 months of age with higher odds of food allergy (OR 2.55). — children under 6 years in cohort, case-control and cross-sectional studies from 40 countries (n = 2800000) Evidence C source
  Peanut after 12 months OR 2.55 (risk difference 6.8%, 95% CI 1.9% to 14.6%)

The bottom line

Portions are close. The US survey counts the peanut butter in a sandwich as 32 g, two tablespoons, and a serving of peanuts as 1 oz, 28 g, while a single serving of butter on its own is 45 g. These are survey default weights, not measured portions. The body gets less energy from nuts than labels assume. A systematic review of 21 human and lab studies found metabolizable energy lower than the standard calorie factors predict for every nut studied, peanuts included, and higher in ground and heated forms, ranking butter above roasted and roasted above raw. It is a narrative review with no pooled number, and the abstract gives no peanut-specific figure. In a 12-week crossover trial in 61 healthy Australians with a mean age of 65 and BMI of 31, high-oleic peanuts at 15 to 20% of energy raised intake by 853 kJ a day, about 10%. Weight rose about 1.1 lb (0.5 kg), less than predicted, and lipids, glucose, insulin and body composition did not differ from the nut-free diet. That was one trial, with whole high-oleic peanuts rather than butter. The EU has not authorized the claim that 1.1 oz (30 g) of peanuts or two tablespoons of peanut butter a day helps achieve healthy cholesterol. Non-authorized means the evidence fell short at assessment, not that it was disproved. Peanuts can reduce iron uptake from the same meal. In 137 women in India, single test meals of bread with nuts, peanuts among them, gave 1.8% iron absorption against 6.6% for bread alone, and 50 mg of vitamin C overcame the effect of peanuts. The data are from 1988 and pool several nuts. Peanuts can carry aflatoxin, a mold toxin. In a meta-analysis of 19 laboratory processing studies, mostly on peanuts, roasting lowered aflatoxin B1 by 46.91%, so roasting reduces it without removing it. These are lab measurements, not human outcomes. We found no trial comparing peanut butter with whole peanuts head to head on any health outcome. The infant result comes with conditions. In LEAP, 640 infants with severe eczema, egg allergy or both ate or avoided peanut until age 5. Peanut allergy at 5 was 1.9 percent with eating against 13.7 percent with avoidance in infants with a negative skin test, and 10.6 against 35.3 percent in those already mildly sensitized. Of 319 infants assigned to eat peanut, 7 reacted at the first supervised challenge and 9 later stopped because of allergic symptoms. It was one open-label trial under specialist supervision, and the benefit holds for the infants it screened in. Peanut allergy is not only a childhood matter. A US survey of 40,443 adults estimated that 1.8 percent have a convincing peanut allergy, self-reported rather than confirmed by a food challenge. Among adults with any food allergy, about half had had a severe reaction and 48 percent first developed it as adults. Small amounts are enough for some. Across 19 challenge studies with 3,151 people with peanut allergy, 4.5 percent reacted with anaphylaxis to 5 mg of peanut protein or less, a small fraction of one kernel. We found no upper limit and no drug interaction for peanuts in adults.

Sources

1. pbpn-r2-01 · food composition dataset
   Peanut butter, creamy: Total lipid (fat) 49.43 G (33.51-54.24, 8 samples), Sodium 220.7 MG (0.0-427.0, 8 samples); Peanuts, raw: Total lipid (fat) 43.28 G (38.68-48.52, 8 samples), Sodium 1.493 MG (0.0-6.74, 8 samples) per 100 g
   USDA FoodData Central Foundation Foods, release 2026-04-30, Peanut butter, creamy and Peanuts, raw · checked 2026-09-30
2. pbpn-r2-02 · food survey dataset
   Peanut butter, fdc_id 2707537: 1 tablespoon 16 g; Guideline amount per sandwich 32 g; 1 single serving 45 g. Peanuts, roasted, unsalted, fdc_id 2707516: 1 oz 28 g; 1 cup 146 g
   USDA FNDDS 2021-2023, Peanut butter fdc 2707537; Peanuts, roasted, unsalted fdc 2707516 · checked 2026-09-30
3. pbpn-r2-03 · systematic review
   The ME of nuts was consistently lower than that predicted by Atwater factors for investigated nut types (almonds, cashews, hazelnuts, pistachios, walnuts, and peanuts). ... ME was influenced by nut type (ME = 22.6 kJ/g for pistachios; ME = 18.5 kJ/g for raw almonds), physical form (flour > chopped > whole nuts), heat processing (butter > roasted > raw) and dose of consumption.
   Adv Nutr, 2023 · checked 2026-09-30
4. pbpn-r2-04 · controlled trial
   the overall geometric mean absorption from the nut meals (1.8%) was significantly less than from the bread meals alone (6.6%, t = 9.8, p less than 0.0005). ... Fifty milligrams ascorbic acid overcame the inhibitory effects of two nuts that were tested (Brazil nuts and peanuts).
   Am J Clin Nutr, 1988 · checked 2026-09-30
5. pbpn-r2-05 · meta-analysis of processing studies
   In most studies, the influence of method on aflatoxin reduction was assessed on peanuts. The results showed that the roasting method significantly reduced aflatoxin B1, B2, G1, and G2 concentrations by 46.91%, 30.66%, 40.88%, and 26.19%, respectively.
   Crit Rev Food Sci Nutr, 2022 · checked 2026-09-30
6. pbpn-r2-06 · RCT (crossover)
   In a randomised cross-over design, 61 healthy subjects (65 ± 7 years, body mass index (BMI) 31 ± 4 kg/m²) alternated either high oleic peanuts (15%-20% of energy) or a nut free diet for 12 weeks. ... Energy intake was 10% higher (853 kJ, p < 0.05), following peanut consumption vs. control
   Nutrients, 2015 · checked 2026-09-30
7. hf2-pbpn-2 · clinical practice guideline
   Whole nuts should not be given to children under 5 years of age. Peanut butter directly from a spoon or in lumps/dollops should not be given to children under 4 years.
   J Allergy Clin Immunol, 2017 · checked 2026-10-08
8. hf2-pbpn-3 · agency advice
   Whole or chopped nuts and seeds. ... Chunks or spoonful of nut and seed butters, such as peanut butter.
   CDC, Infant and Toddler Nutrition: Choking Hazards · checked 2026-10-08
9. hf2-pbpn-5 · randomized controlled trial
   Among the 319 participants randomly assigned to consumption, 7 were instructed not to consume peanuts because they had a positive result at baseline to the oral food challenge, and 9 terminated consumption largely because they began to have allergic symptoms to peanuts. This indicates that peanut consumption may not be possible in some children who meet the LEAP eligibility criteria. In addition, the LEAP study design excluded 9.1% of the infants who were screened (76 of 834) because large wheals (greater than 4 mm in diameter) developed after the skin-prick test
   N Engl J Med, 2015 · checked 2026-10-08
10. hf2-pbpn-7 · systematic review with individual participant data meta-analysis
    A total of 19 studies were included (covering a total of 3151 participants, 534 of whom subsequently underwent further peanut challenge). At individual participant data meta-analysis, 4.5% (95% CI, 1.9% to 10.1%) of individuals reacted to 5 mg or less of peanut protein with anaphylaxis
    J Allergy Clin Immunol, 2021 · checked 2026-10-08
11. pbpn-r2-09 · regulatory decision
    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 2026-09-30
12. hf2-pbpn-1 · clinical practice guideline
    The EP recommends that infants with severe eczema, egg allergy or both have introduction of age-appropriate peanut-containing food as early as 4 to 6 months of age to reduce the risk of peanut allergy. ... The EP recommends that evaluation with peanut-specific IgE and/or skin prick testing be strongly considered before introduction of peanut to determine if peanut should be introduced, and if so, the preferred method of introduction.
    J Allergy Clin Immunol, 2017 · checked 2026-10-08
13. hf2-pbpn-4 · randomized controlled trial
    We randomly assigned 640 infants with severe eczema, egg allergy, or both to consume or avoid peanuts until 60 months of age. ... Among the 530 infants in the intention-to-treat population who initially had negative results on the skin-prick test, the prevalence of peanut allergy at 60 months of age was 13.7% in the avoidance group and 1.9% in the consumption group (P<0.001). Among the 98 participants in the intention-to-treat population who initially had positive test results, the prevalence of peanut allergy was 35.3% in the avoidance group and 10.6% in the consumption group (P=0.004).
    N Engl J Med, 2015 · checked 2026-10-08
14. hf2-pbpn-6 · cross-sectional survey
    Surveys were completed by 40 443 adults ... The most common allergies were shellfish (2.9%; 95% CI, 2.7%-3.1%), milk (1.9%; 95% CI, 1.8%-2.1%), peanut (1.8%; 95% CI, 1.7%-1.9%), tree nut (1.2%; 95% CI, 1.1%-1.3%), and fin fish (0.9%; 95% CI, 0.8%-1.0%). Among food-allergic adults, 51.1% (95% CI, 49.3%-52.9%) experienced a severe food allergy reaction, 45.3% (95% CI, 43.6%-47.1%) were allergic to multiple foods, and 48.0% (95% CI, 46.2%-49.7%) developed food allergies as an adult.
    JAMA Netw Open, 2019 · checked 2026-10-08
15. pbpn-r2-07 · meta-analysis of RCTs
    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 2026-09-30
16. pbpn-r2-08 · meta-analysis of observational studies
    delayed solid food introduction (eg, peanut after age 12 months [OR, 2.55; RD, 6.8%; 95% CI, 1.9%-14.6%])
    JAMA Pediatr, 2026 · checked 2026-09-30