Peanut butter or sunflower seed butter: one has trials, the other has a label

Only one of these two spreads has been tested in people. In a randomized trial 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 walking speed, the main outcome, or grip strength or muscle mass. Two secondary measures did move: rising from a chair five times got 1.23 seconds faster (95% CI 0.37 to 2.09) and leg power rose by 22 W, against usual care with no placebo. Sunflower seed butter has no trial of its own and no head-to-head comparison with peanut butter. What separates them is composition. Per 100 g, unsalted sunflower seed butter has 311 mg magnesium against 168 mg, 22.89 mg vitamin E against 9.1 mg and 4.678 g saturated fat against 10.325 g, with less protein, 17.28 g against 22.21 g.

How much is actually in it

• Per 100 g, sunflower seed butter has about twice the magnesium and vitamin E and half the saturated fat of peanut butter, but less protein. — — Evidence E source
  Sunflower vs peanut per 3.5 oz (100 g): magnesium 311 vs 168 mg; vitamin E 22.89 vs 9.1 mg; saturated fat 4.678 vs 10.325 g; protein 17.28 vs 22.21 g; selenium 104.4 vs 4.1 ug
• Across 8 USDA samples of creamy peanut butter, polyunsaturated fat ranged from 3.55 to 12.93 g per 3.5 oz (100 g), a spread of 89%. — — (n = 8 samples) Evidence E source
  PUFA mean 10.53 g, range 3.55 to 12.93 g, median 11.49 g per 3.5 oz (100 g); MUFA 28.01 g, range 24.53 to 34.34 g

What a real portion looks like

• US survey data count 1 tablespoon of peanut butter as 16 g and a sandwich amount as 32 g, the same 16 g tablespoon USDA lists for sunflower seed butter. — — Evidence E source
  Peanut butter: 1 tbsp 16 g, per sandwich 32 g, single serving 1.6 oz (45 g); sunflower seed butter: 1 tbsp 16 g

What your body absorbs

• In 15 obese women, adding 1.5 oz (42.5 g) of peanut butter to breakfast lowered later blood sugar and raised gut satiety hormones, while whole peanuts had weaker, non-significant effects. — obese women at high type 2 diabetes risk, 42.5 g whole peanuts, peanut butter or none added to a 75 g carbohydrate breakfast (n = 15) Evidence B source
  Lower second-meal glucose IAUC and higher PYY, GLP-1, CCK with peanut butter vs control; whole peanuts similar direction, not significant

What cooking and storage change

• In 63 healthy adults, fecal fat was 5.22% with whole peanuts versus 3.11% with peanut butter. — 63 healthy adults in Ghana, Brazil and the USA, 15 to 16 per arm, average BMI 21.8 (n = 63) Evidence C source
  Fecal fat 5.22 +/- 0.29% whole peanuts vs 3.11 +/- 0.31% peanut butter (P = 0.001); fecal energy 21.4 vs 18.8 kJ/g

What it does to your health

• In 120 older adults at risk of falls, 1.5 oz (43 g) of peanut butter a day for 6 months cut five-times sit-to-stand time by 1.23 s but did not improve gait speed, strength or muscle mass. — community-dwelling adults aged 65 and over at risk of falls, Melbourne, 70% female, mean age 76, 43 g/day peanut butter vs usual care for 6 months (n = 120) Evidence B source
  5STS time -1.23 s (95% CI -2.09 to -0.37); muscle power +22.0 W (95% CI 7.1 to 36.9); gait speed, grip, lean mass unchanged
• Observational data link peanut butter with a 13% lower incidence of type 2 diabetes in prospective cohorts, with very low certainty. — 8 observational studies (5 prospective cohorts, 3 cross-sectional) pooled to August 2020 (n = 8 studies) Evidence C source
  RR 0.87 (95% CI 0.77 to 0.98) for peanut butter and T2D incidence; no association for peanuts or tree nuts

Safety, limits and interactions

• In 30 highly peanut-allergic children, touching or smelling peanut butter caused no systemic or breathing reactions, only local skin redness or itch in up to 8. — children with significant peanut allergy, median age 7.7, median peanut IgE above 100 kIU/L, skin contact 0.04 tsp (0.2 mL) for 1 minute and inhalation for 10 minutes (n = 30) Evidence B source
  0 systemic or respiratory reactions; erythema 3, pruritus 5, wheal-and-flare 2 at the skin contact site
• In a Canadian retail survey of jars bought in 2007, 3 of 104 nut butters (3%), all of them peanut butters, produced cultures containing botulinum neurotoxin. — 92 peanut butters and 12 other nut butter spreads from grocery stores in Ottawa (n = 104) Evidence C source
  3/104 (3%) positive for botulinum neurotoxin in enrichment culture

What people believe that the data does not support

• Sunflower seed allergy is reported, yet US food labels must declare sesame but not sunflower or other seeds. — case report of sunflower seed oral immunotherapy with review of seed allergy (n = 1) Evidence D source
  No outcome figures in abstract
• The EU refused a claim that two tablespoons (30 g) of peanut butter a day help achieve healthy cholesterol and heart health. — — Evidence E source
  Status non-authorized

What is still unknown

• In a Dutch cohort of 120,852 adults, peanuts and tree nuts were linked with lower mortality but peanut butter was not. — men and women aged 55 to 69 in the Netherlands Cohort Study, 1986 to 1996, 8,823 deaths analyzed (n = 120852) Evidence C source
  10+ g/day nuts vs none HR 0.77 (95% CI 0.66 to 0.89) total mortality; peanut butter no association
• In 71,704 older US women followed for decades, more peanuts and walnuts but not peanut butter went with lower frailty. — non-frail women aged 60 and over in the Nurses' Health Study, 1990 to 2016 (n = 71704) Evidence C source
  5+ servings/week nuts HR 0.80 (0.73 to 0.87) vs under 1/month; peanut butter not associated

The bottom line

A tablespoon of either is 16 g, and US surveys count 32 g for a sandwich. Peanut butter itself varies: across 8 USDA samples of creamy peanut butter, polyunsaturated fat ran from 3.55 to 12.93 g per 3.5 oz (100 g), likely reflecting high-oleic peanuts in some brands. Grinding seems to matter. In a feeding study of 63 healthy adults, whose abstract does not say it was randomized, stool held 5.22% fat after whole peanuts and 3.11% after peanut butter. In 15 obese women at high risk of type 2 diabetes, 1.5 oz (42.5 g) of peanut butter at breakfast lowered blood sugar after the next meal and raised gut satiety hormones, over a single test day. Whole peanuts pointed the same way without reaching significance. Observational data link peanut butter with 13% lower incidence of type 2 diabetes (RR 0.87, 95% CI 0.77 to 0.98) with certainty rated very low. The picture is mixed beyond that. In 120,852 Dutch adults, peanuts and tree nuts went with lower mortality and peanut butter did not. In 71,704 older US nurses, peanuts and walnuts went with less frailty and peanut butter again did not. Nobody knows why, since these studies cannot separate the spread from what people eat it with. The EU refused a claim that two tablespoons of peanut butter a day help achieve healthy cholesterol. Allergy is the main caution. In 30 children with severe peanut allergy, touching or smelling peanut butter caused no whole-body or breathing reactions, only local redness or itch in up to 8. That result covers casual contact and says nothing about eating it. Sunflower seed allergy exists too, and US labels must declare sesame but not sunflower or other seeds, so a label can stay silent about it. A Canadian survey of jars bought in 2007 found botulinum toxin-producing cultures from 3 of 104, all peanut butter, with no established link to infant botulism. We found no evidence on either spread with medicines or in pregnancy.

Sources

1. pbsb-r4-11 · food composition data
   Seeds, sunflower seed butter, without salt (FDC 170155, SR Legacy): protein 17.28 g, sat fat 4.678 g, magnesium 311 mg, vitamin E 22.89 mg, selenium 104.4 ug per 100 g || Peanut butter, smooth style, without salt (FDC 172470, SR Legacy): protein 22.21 g, sat fat 10.325 g, magnesium 168 mg, vitamin E 9.1 mg, selenium 4.1 ug per 100 g
   USDA FoodData Central, SR Legacy 2019, FDC 170155 and 172470 · checked 2026-09-29
2. pbsb-r4-12 · food composition data
   Peanut butter, Creamy | Fatty acids, total polyunsaturated | 10.53 G | range 3.55-12.93, median 11.49, 8 samples, spread 89% || Peanut butter, Creamy | Fatty acids, total monounsaturated | 28.01 G | range 24.53-34.34, median 27.21, 8 samples, spread 35%
   USDA FoodData Central, Foundation Foods, release 2026-04-30 (Peanut butter, Creamy) · checked 2026-09-29
3. pbsb-r4-13 · food portion data
   FNDDS 42202000 Peanut butter (fdc 2707537) | 1 tablespoon | 16 g || Guideline amount per sandwich | 32 g || 1 single serving | 45 g || SR Legacy FDC 170155 Seeds, sunflower seed butter, without salt | 1 tbsp | 16 g
   FNDDS 2021-2023, USDA, code 42202000; SR Legacy FDC 170155 · checked 2026-09-29
4. pbsb-r4-03 · randomized crossover trial
   WP led to similar but non-significant effects. 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
5. pbsb-r4-04 · controlled feeding study
   Compared to control, the percentage of fat in the feces increased significantly for the P group (5.22+/-0.29%) relative to the other three groups ((PO=3.07+/-0.36%, PB=3.11+/-0.31% (P=0.001), and PF=3.75+/-0.40% (P=0.019)).
   Int J Obes (Lond), 2008 · checked 2026-09-29
6. pbsb-r4-01 · 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
   J Cachexia Sarcopenia Muscle, 2026 · checked 2026-09-29
7. pbsb-r4-05 · meta-analysis of cohort studies
   Meta-analyses of prospective cohort studies showed an inverse association between peanut butter consumption and T2D incidence (RR: 0.87; 95% CI: 0.77, 0.98; I2 = 50.6%; Pheterogeneity = 0.16), whereas no association was observed between peanuts or tree nuts and T2D.
   Am J Clin Nutr, 2021 · checked 2026-09-29
8. pbsb-r4-02 · randomized controlled challenge
   None experienced a systemic or respiratory reaction. Erythema (3 subjects), pruritus without erythema (5 subjects), and wheal-and-flare reactions (2 subjects) developed only at the site of skin contact with peanut butter.
   J Allergy Clin Immunol, 2003 · checked 2026-09-29
9. pbsb-r4-08 · prevalence survey
   Three of the peanut butters from the entire survey of nut butter spreads (3/104, 3%) produced cultures containing botulinum neurotoxin.
   Curr Microbiol, 2024 · checked 2026-09-29
10. pbsb-r4-09 · case report and review
    Food labels in the United States are now required to indicate the presence of sesame but other seeds are not required.
    Allergy Asthma Proc, 2024 · checked 2026-09-29
11. pbsb-r4-10 · 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 2026-09-29
12. pbsb-r4-06 · prospective cohort study
    Peanuts and tree nuts were inversely related to mortality, whereas peanut butter was not.
    Int J Epidemiol, 2015 · checked 2026-09-29
13. pbsb-r4-07 · prospective cohort study
    Higher intakes of peanuts and walnuts, but not peanut butter, were also inversely associated with frailty.
    J Nutr, 2023 · checked 2026-09-29