Potatoes: the cooking method is the whole answer

In 205 thousand people followed for decades, three servings a week of chips tracked with 20 percent more type 2 diabetes and the same amount of baked, boiled or mashed potato tracked with nothing at all. Swap those three weekly servings of chips for whole grains and the modelled risk drops 19 percent. Swap boiled potatoes for white rice and it goes up. The question to ask is what the potato replaces and what happened to it in the pan. Seven harmonised cohorts found the same split for the heart: no association for potatoes overall, and 10 percent more hypertension for fried ones.

The numbers, per 100 g

What your body absorbs

• Potato baked then chilled cut the insulin response by a quarter compared with the same potato boiled and served hot. — 30 women with mean BMI 32.8, fasting glucose 110.5 mg/dL and fasting insulin 10.3 microIU/L (n = 30) Evidence B source
  The chilled potato lowered glucose by 4.8% and 9.2% at 15 and 30 minutes, insulin by 25.8% and 22.6%, and glucose-dependent insulinotropic peptide by 41.1% and 37.6%; area under the curve was lower for insulin and GIP but not for glucose, GLP-1, peptide YY or satiety; participants ate more carbohydrate in the 48 hours after the chilled potato
• Firm-cooked potato swapped for a third of the rice in a meal flattened both the glucose and the insulin peak. — adults eating rice-potato mixed test meals Evidence B source
  Hard-cooked potato retained more resistant starch and total phenolics than soft-cooked, required more chews and longer eating time, and when eaten with rice lowered glucose incremental area under the curve, peak glucose and glycaemic excursion, as well as insulin area under the curve, peak insulin and the insulin resistance index; the effect did not carry over to the next meal, though the combined glucose curve over 540 minutes was lower

What it does to your health

• Three servings of chips a week tracked with a fifth more diabetes, and the same amount of boiled or baked potato tracked with nothing. — 205107 men and women free of diabetes, cardiovascular disease and cancer at baseline in the Nurses' Health Study, Nurses' Health Study II and Health Professionals Follow-up Study (n = 205107 across 5175501 person years) Evidence C source
  22299 developed type 2 diabetes; per three servings a week, total potato hazard ratio 1.05 (95% CI 1.02-1.08) and French fries 1.20 (1.12-1.28), while baked, boiled or mashed potatoes gave 1.01 (0.98-1.05); substituting three weekly servings with whole grains lowered rates by 8% for total potato, 4% for baked or boiled and 19% for French fries; substituting with white rice raised risk
• Across seven cohorts potatoes carried no heart disease risk, and only the fried ones carried any blood pressure risk. — 110063 participants for cardiovascular disease and 67146 for hypertension, mean age 25 to 72, 65% women, eating potatoes 1.9 to 4.3 times a week (n = 110063) Evidence C source
  Comparing 5 or more servings a week with none, hazard ratio 0.96 (0.89-1.04) for cardiovascular disease and 1.04 (0.99-1.08) for hypertension; baked, boiled and mashed potatoes showed no association; fried potatoes showed no cardiovascular association but a 10% higher hypertension risk (4% to 17%) at one or more servings a week
• The largest pooled review found potatoes unrelated to blood pressure, heart disease or stroke, and weakly related to diabetes whether fried or not. — 51 articles covering 103 studies (n = 103 studies) Evidence C source
  Highest against lowest total potato intake gave hypertension 1.07 (0.95-1.21), diabetes 1.08 (0.96-1.22), gestational diabetes 1.16 (0.86-1.57), coronary heart disease 1.00 (0.99-1.02), cardiovascular disease 0.97 (0.91-1.03) and stroke 0.97 (0.88-1.06), none significant; fried potato raised diabetes risk 1.16 (1.04-1.30) and non-fried potato 1.05 (1.01-1.10)

Safety, limits and interactions

• The evidence on acrylamide points both ways at once, which is why nobody can tell you how much fried potato is too much. — 28 studies, predominantly cross-sectional and predominantly from the United States NHANES sample (n = 28 studies) Evidence C source
  Higher acrylamide exposure was associated with higher cardiovascular mortality but inversely associated with glucose and lipid levels and with diabetes, obesity and metabolic syndrome; glycidamide, its reactive metabolite, was positively associated with higher glucose, lipids, systolic pressure and obesity

What is still unknown

• The Nordic review written to set guidelines concluded the evidence on potatoes is very limited and that how you cook them is what matters. — published systematic reviews and meta-analyses on potatoes and health outcomes Evidence E source
  Moderate potato consumption is not associated with substantial chronic disease risk and potatoes may be part of a healthy diet; health effects vary greatly with cooking method and intake of French fries should be limited; the overall evidence is described as very limited

The bottom line

Two things you can do. Cook and chill: baked then chilled potato raised resistant starch enough to cut the insulin response by about a quarter compared with the same potato boiled and served hot, though the glucose curve over the whole meal did not differ and nobody has tested whether reheating keeps the effect. And cook it firm: replacing a third of the rice in a meal with hard-cooked potato flattened both the glucose and the insulin peak. On acrylamide, the compound that makes fried potato sound frightening, the human evidence points in two directions at once, with higher exposure tracking both higher cardiovascular mortality and better glucose and lipids. That pattern usually means confounding rather than a complicated truth.

Sources

1. pot-dr-04 · randomised crossover trial
   Results showed that the chilled potato elicited significant reductions at 15 and 30 min in glucose (4.8% and 9.2%), insulin (25.8% and 22.6%), and glucose-dependent insulinotropic peptide (GIP) (41.1% and 37.6%), respectively.
   Nutrients, 2019 · checked 2026-09-22
2. pot-dr-07 · randomised controlled acute trial
   HP + R significantly reduced postprandial glucose iAUC, peak glucose and glycemic excursion. SP + R increased glycemic variability despite reduced iAUCglucose. HP + R also lowered iAUCinsulin, peak insulin and insulin resistance index.
   Nutrients, 2026 · checked 2026-09-22
3. pot-dr-01 · prospective cohort analysis with substitution meta-analysis
   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 2026-09-22
4. pot-dr-02 · harmonised meta-analysis of prospective cohorts
   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 2026-09-22
5. pot-dr-03 · systematic review and meta-analysis of observational studies
   nonfried potato intake was significantly associated with increased diabetes risk (1.05; 95% CI: 1.01, 1.10) but not hypertension (1.06; 95% CI: 0.97, 1.15).
   Nutr Rev, 2025 · checked 2026-09-22
6. pot-dr-05 · systematic review of observational studies
   Higher acrylamide exposure was associated with an increased risk of cardiovascular mortality but was inversely associated with glucose and lipid levels, as well as key cardiovascular risk factors such as diabetes, obesity, and metabolic syndrome.
   Nutrients, 2024 · checked 2026-09-22
7. pot-dr-06 · scoping review for dietary guidelines
   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 2026-09-22