Pasta and potatoes: modest numbers, and fries stand apart

Pasta has one pooled trial result, and it is indirect. A meta-analysis of 32 trial comparisons with 2448 adults found no trial of pasta on its own. Pasta eaten within low glycemic index diets lowered body weight by 1.4 lb (95% CI -1.9 to -0.93; metric: 0.63 kg, -0.84 to -0.42) against higher index diets over 3 weeks or more. The EU refused a claim that the carbohydrates in pasta give a low and slow blood sugar response, which means the evidence fell short when it was assessed. For potatoes, how they are cooked is the story. In US cohorts of 205,107 adults followed for up to 36 years, each 3 extra weekly servings of French fries went with a 20% higher rate of type 2 diabetes (HR 1.20, 95% CI 1.12 to 1.28). Baked, boiled or mashed potatoes showed no link (HR 1.01, 0.98 to 1.05), and total potatoes came out at 5% per 3 weekly servings. These are food questionnaires with possible residual confounding, so they show association.

What a real portion looks like

• US dietary survey coding counts a cup of cooked pasta as 140 g and a medium boiled potato as 170 g. — US food coding portion measures (n = 2 foods) Evidence E source
  Pasta 1 cup cooked 140 g, 1 oz dry yields 80 g; potato medium 170 g, small 130 g, large 300 g

What your body absorbs

• In a stable-isotope RCT on 28 iron-deficient young women in Peru, 16.6% of iron was absorbed from ordinary potatoes, and a biofortified variety delivered 46% more total iron. — 28 women aged 18-25 with low iron stores, Peruvian highlands, 10 meals of 460 g (n = 28) Evidence B source
  Fractional iron absorption 16.6% (ordinary) vs 12.1% (biofortified); total iron absorbed 0.24 vs 0.35 mg per meal

What cooking and storage change

• In US cohorts of 205,107 adults, each 3 weekly servings of French fries were linked with 20% higher type 2 diabetes risk, while baked, boiled or mashed potatoes showed no link. — 205,107 US nurses and health professionals, up to 36 years of follow-up (n = 205107) Evidence C source
  French fries HR 1.20 (95% CI 1.12 to 1.28) per 3 servings/week; baked, boiled or mashed HR 1.01 (0.98 to 1.05)
• By the USDA retention table, boiled and drained pasta keeps 70% of folate and 65% of thiamin, while potatoes boiled in their skin keep 90% of folate and 80% of thiamin. — USDA group factors: Cereal Grains and Pasta boiled drained; potatoes boiled in skin (n = 2 table rows) Evidence E source
  Pasta: folate 70%, thiamin 65%, potassium 30% retained; potatoes in skin: folate 90%, thiamin 80%, potassium 90%, vitamin C 75%
• The Nordic Nutrition Recommendations 2023 review concluded that moderate potato intake carries no substantial chronic disease risk, but French fries should be limited. — systematic reviews and meta-analyses on potatoes, Nordic and Baltic context (n = 10 articles) Evidence C source
  Moderate potato intake not linked with substantial risk; fried potatoes to be limited

What it does to your health

• In seven pooled cohorts of 110,063 adults, eating potatoes 5 or more times a week was not linked with cardiovascular disease, but fried potatoes weekly were linked with 10% more hypertension. — 110,063 adults in seven prospective cohorts (n = 110063) Evidence C source
  CVD HR 0.96 (0.89-1.04) for 5+ servings/week; hypertension +10% (95% CI 4% to 17%) for 1+ servings/week of fried potatoes
• Across 17 cohorts with over 875,000 people, refined grains including pasta were not linked with cardiovascular disease. — over 875,000 participants in 17 prospective cohorts (n = 875000) Evidence C source
  CVD HR 1.08 (95% CI 0.99 to 1.18)

What people believe that the data does not support

• A meta-analysis of 32 trial comparisons (2448 adults) found pasta eaten within low-GI diets lowered body weight by 1.4 lb (0.63 kg) versus higher-GI diets. — 2448 adults in randomized trials of 3 weeks or longer (n = 2448) Evidence A source
  Body weight -1.4 lb (95% CI -1.9 to -0.93; metric: -0.63 kg, -0.84 to -0.42), BMI -0.26 kg/m2 (95% CI -0.36 to -0.16)
• In a crossover RCT on 26 adults, meals with instant mashed potatoes or baked fries led to 13-16% less total energy eaten than rice meals. — 26 healthy adults aged 18-45, single meals with ad libitum starch (n = 26) Evidence B source
  13-16% less total energy after potato meals than rice meals; post-pizza glucose lower after mashed potatoes
• The same analysis estimated that swapping 3 weekly servings of potatoes for whole grains would lower diabetes risk by 8%, whereas swapping them for white rice would raise it. — 205,107 US adults in three cohorts (n = 205107) Evidence C source
  Replacing total potatoes with whole grains -8% (95% CI 5% to 11%); French fries -19%; white rice instead of potatoes higher risk
• The EU did not authorize a claim that carbohydrates in pasta give a low and slow blood sugar response. — EU nutrition and health claims register Evidence E source
  Claim status non-authorized

Who this works differently for

• A meta-analysis of 5 RCTs found non-soy plant proteins, potato protein among them, built less muscle mass than animal protein (SMD -0.58). — adults in 5 randomized trials comparing rice, chia, oat or potato protein with animal protein (n = 5 RCTs) Evidence A source
  SMD -0.58 (95% CI -1.06 to -0.09) for muscle mass

The bottom line

In the same cohorts, modeled swaps of 3 weekly servings of potatoes for whole grains went with an 8% lower diabetes rate (95% CI 5% to 11%), and 19% for French fries. Swapping potatoes for white rice went with a higher rate. That is a statistical substitution, and nobody changed their diet. Seven pooled cohorts of 110,063 adults found no link between eating potatoes 5 or more times a week and cardiovascular disease (HR 0.96, 95% CI 0.89 to 1.04), while fried potatoes once a week or more went with 10% more hypertension (95% CI 4% to 17%). For pasta, 17 cohorts with over 875,000 people found refined grains unlinked to cardiovascular disease (HR 1.08, 95% CI 0.99 to 1.18), with pasta pooled together with bread and rice. The Nordic Nutrition Recommendations 2023 review read this work the same way. It concluded that moderate potato intake is not linked with a substantial risk of chronic disease and that fries should be limited, on evidence its authors call very limited. In a crossover trial on 26 healthy adults eating single meals freely, baked fries or instant mashed potatoes led to 13 to 16% less total energy eaten than rice meals. These were one-off meals, compared with rice and never with pasta. Boiling costs pasta more than potatoes. By USDA group retention factors, boiled and drained pasta keeps 70% of its folate, 65% of thiamin and 30% of potassium. Potatoes boiled in their skin keep 90% of folate, 80% of thiamin, 90% of potassium and 75% of vitamin C. These are group factors from 1975, never measured on a specific product. A cup of cooked pasta is counted as 140 g, and a medium boiled potato as 170 g. In a stable isotope trial on 28 iron deficient women aged 18 to 25 in the Peruvian highlands, 16.6% of the iron in 16 oz (460 g) meals of ordinary potato was absorbed. A biofortified variety had a lower share absorbed (12.1%) and still delivered 0.35 mg per meal against 0.24 mg. Labeled iron was added to the potatoes for the measurement. Isolated potato protein is a different product: in 5 trials, non soy plant proteins including potato protein built less muscle than animal protein (SMD -0.58, 95% CI -1.06 to -0.09). Our cards cover no allergy, pregnancy, children or medicine interactions for either food, so this page carries no safety section.

Sources

1. papo-r2-10 · portion dataset
   Pasta, cooked, FNDDS code 56130000, fdc_id 2708357: 1 cup, cooked, measure 10043, 140 g; 1 oz, dry, yields, measure 40049, 80 g; Potato, boiled, NFS, FNDDS code 71102980, fdc_id 2709385: 1 small, measure 62015, 130 g; 1 medium, measure 61238, 170 g; 1 large, measure 60919, 300 g
   USDA FNDDS, food codes 56130000 (FDC 2708357) and 71102980 (FDC 2709385) · checked 2026-09-28
2. papo-r2-07 · RCT
   Geometric mean (95% CI) fractional iron absorption from the iron-biofortified clone and the nonbiofortified variety were 12.1% (10.3%-14.2%) and 16.6% (14.0%-19.6%), respectively (P < 0.001). Total iron absorption from the iron-biofortified clone and the nonbiofortified variety were 0.35 mg (0.30-0.41 mg) and 0.24 mg (0.20-0.28 mg) per 460 g meal, respectively (P < 0.001).
   J Nutr, 2023 · checked 2026-09-28
3. papo-r2-03 · cohort
   For every increment of three servings weekly of total potato, the rate for T2D increased by 5% (hazard ratio 1.05, 95% confidence interval (CI) 1.02 to 1.08) and for every increment of three servings weekly of French fries the rate increased by 20% (1.20, 1.12 to 1.28). Intake of combined baked, boiled, or mashed potatoes was not significantly associated with T2D risk (pooled hazard ratio 1.01, 95% CI 0.98 to 1.05).
   BMJ, 2025 · checked 2026-09-28
4. papo-r2-09 · reference dataset
   USDA-RETN-R6:381 PASTA,BOILED,DRAINED, group Cereal Grains and Pasta: potassium_mg 30% retained, thiamin_mg 65%, folate_total_ug 70%, iron_mg 75%; USDA-RETN-R6:3307 POTATOES,BOILED IN SKIN, group Vegetables and Vegetable Products: vitamin_c_mg 75% retained, thiamin_mg 80%, potassium_mg 90%, folate_total_ug 90%
   USDA Table of Nutrient Retention Factors, Release 6, 2007, Retn_Codes 381 and 3307 · checked 2026-09-28
5. papo-r2-12 · scoping review
   Current available evidence indicates that moderate consumption of potatoes is not associated with a substantial risk of chronic diseases, and that they may be part of a healthy diet. However, the health effects vary greatly depending on cooking methods, and studies indicate that the intake of French fries/fried potatoes should be limited.
   Food Nutr Res, 2024 · checked 2026-09-28
6. papo-r2-05 · meta-analysis of cohorts
   In the primary analysis, total potato intake was not associated with the risk of either CVD or HTN: multivariable adjusted HR (95% CI) comparing 5+ servings/week to no potato intake: 0.96 (0.89-1.04) for CVD and 1.04 (0.99-1.08) for HTN. In secondary analyses, the consumption of combined baked, boiled, and mashed potatoes was not associated with CVD or HTN; while fried potato consumption was not associated with CVD risk, there was a 10% higher risk of HTN (95% CI: 4% to 17%) comparing 1+ servings/week to no fried potato intake.
   Nutrients, 2025 · checked 2026-09-28
7. papo-r2-06 · meta-analysis of cohorts
   Meta-analyses of hazard ratios (HR) and 95% confidence intervals (CI) obtained from 17 prospective cohort studies (>875,000 participants) indicated that refined grain intake was not associated with risk of CVD (HR = 1.08, 95% CI, 0.99-1.18, I2 = 70%; 9 cohorts)
   Trends Cardiovasc Med, 2024 · checked 2026-09-28
8. papo-r2-01 · meta-analysis
   We identified no trial comparisons of the effect of pasta alone and 32 trial comparisons (n=2448 participants) of the effect of pasta in the context of low-GI dietary patterns. Pasta in the context of low-GI dietary patterns significantly reduced body weight (MD=-0.63 kg; 95% CI -0.84 to -0.42 kg) and BMI (MD=-0.26 kg/m2; 95% CI -0.36 to -0.16 kg/m2) compared with higher-GI dietary patterns.
   BMJ Open, 2018 · checked 2026-09-28
9. papo-r2-02 · RCT
   Participants consumed 23-25% less treatment meal energy (kcal), 32-34% less CHO energy (kcal), and 13-16% less total energy (kcal) after the BFF and IMP than rice meals (P < 0.0001).
   J Nutr, 2024 · checked 2026-09-28
10. papo-r2-04 · cohort
    In substitution analyses, replacing three servings weekly of potatoes with whole grains was estimated to lower T2D rates by 8% (95% CI 5% to 11%) for total potatoes, 4% (1% to 8%) for baked, boiled, or mashed potatoes, and 19% (14% to 25%) for French fries. In contrast, replacing total potatoes or baked, boiled, or mashed potatoes with white rice was associated with an increased risk of T2D.
    BMJ, 2025 · checked 2026-09-28
11. papo-r2-11 · regulatory decision
    POL-HC-6873 Carbohydrates in pasta products Kolhydrater i pasta ger ett lågt och långsamt blodsockersvar/har ett lågt glykemiskt index (GI). Carbohydrates in pasta products provide a low and slow blood sugar response/have a low glycaemic index (GI). Non-authorised
    EU Register on nutrition and health claims, claim POL-HC-6873, snapshot 2026-09-21 · checked 2026-09-28
12. papo-r2-08 · meta-analysis
    yet animal protein improved muscle mass compared with non-soy plant proteins (rice, chia, oat, and potato; SMD = -0.58; 95% CI: -1.06, -0.09; P = .02) (n = 5 RCTs)
    Nutr Rev, 2025 · checked 2026-09-28