Chili: the pepper is well studied, the canned entree is not

One thing before anything else. The USDA record behind this page is the canned entree, chili with no beans, while every study gathered here is about the chili pepper. Read them as two different foods. The clearest human finding is about iron. In 10 healthy young women in Thailand eating a rice meal with vegetables and iron-fortified fish sauce, adding 4.2 g of freeze-dried chili powder cut iron absorption from that meal by 38 percent, from 9.7 percent down to 6.0 percent (P = 0.0017). Turmeric with twice the polyphenols had no effect, so the question is which polyphenols rather than how many. That was ten women, one meal and one dose of chili, measured with stable isotopes, so it describes a single meal rather than iron status over months. Everything else here is two piles of observational data pointing in opposite directions.

The numbers, per 100 g

What your body absorbs

• Adding 4.2 g of freeze-dried chili powder to a rice meal cut iron absorption by 38% in 10 young women, from 9.7% without chili to 6.0% with it. — 10 healthy young women in Thailand eating a rice-based meal with vegetables and iron-fortified fish sauce, in a randomised crossover design with stable iron isotopes (n = 10) Evidence B source
  Iron absorption 6.0% with chili versus 9.7% without, a 38% reduction, P = 0.0017, while turmeric with twice the polyphenols had no effect

What it does to your health

• Pooling 4 prospective cohorts with 564,748 people, eating chili pepper at least now and then went with a 13% lower risk of death from any cause (HR 0.87, 95% CI 0.85 to 0.90). — 564,748 adults in 4 prospective cohort studies, among whom 31,527 died of any cause, 10,184 of cardiovascular disease and 9,868 of cancer (n = 564748) Evidence C source
  All-cause mortality HR 0.87 (95% CI 0.85 to 0.90), cardiovascular HR 0.89 (0.85 to 0.93), cancer HR 0.92 (0.88 to 0.97), with almost no heterogeneity
• Twenty-four overweight adults took a slow-release red chili extract giving 4 mg of capsaicinoids a day for 28 days, and body weight fell 2.1% and body mass index 2.2% against placebo. — 24 healthy overweight adults randomised to placebo or to 200 mg a day of a fenugreek-fibre formulation of red chili extract for 28 days, 12 per group (n = 24) Evidence B source
  Body weight down 2.1%, waist to hip ratio down 4%, body mass index down 2.2% versus placebo, with no adverse events or changes in safety bloodwork

Safety, limits and interactions

• Across 13 studies with 3,095 gastric cancer cases and 4,761 controls, moderate to high chili consumption carried odds of gastric cancer 1.96 times those of low consumption (OR 1.96, 95% CI 1.59 to 2.42). — 3,095 people with gastric cancer and 4,761 controls in 13 studies pooled by random or fixed effects models (n = 7856) Evidence C source
  Odds ratio 1.96 (95% CI 1.59 to 2.42) for moderate to high consumption, 2.28 (1.76 to 2.96) for high consumption and 0.72 (0.36 to 1.41) for moderate consumption alone
• Chili can act as a true allergen and not only as an irritant. In a 19-year-old woman whose sore patchy tongue worsened after spicy food, the skin prick test for chili was positive and the diagnosis was chili-induced geographic tongue. — one 19-year-old woman with a year of soreness and red patches on the dorsal tongue that worsened after spicy food (n = 1) Evidence C source
  Positive skin prick test to chili with eosinophils 4% and total IgE 698 IU/mL, and a diagnosis of chili-induced geographic tongue

What people believe that the data does not support

• An umbrella review that gathered 11 systematic reviews and 27 findings about spicy food concluded that the health effect of chili peppers is unclear, with harm reported for cancers of the gullet, stomach and gallbladder and benefit reported for metabolism and mortality. — 27 findings pooled from 11 systematic reviews and meta-analyses in humans, graded with AMSTAR and GRADE (n = 11 reviews) Evidence C source
  Direct correlations with oesophageal, gastric and gallbladder cancer alongside inverse ones for metabolism, mortality and cardiovascular disease

Who this works differently for

• In 44 women with gestational diabetes at 22 to 33 weeks, randomised to 5 mg of capsaicin a day or placebo for 4 weeks, the share of large-for-gestational-age newborns was lower in the capsaicin group (P = 0.022). — 44 pregnant women with gestational diabetes mellitus at 22 to 33 gestational weeks, 42 of whom completed the 4-week trial (n = 44) Evidence B source
  Fewer large-for-gestational-age newborns in the capsaicin group than in the placebo group, P = 0.022
• Two elderly patients were worked up for obstructive pneumonia or a tumour before bronchoscopy found chili pepper fragments blocking their small airways, and both were left with bronchiectasis after removal. — two elderly patients with subacute respiratory symptoms, investigated with serial computed tomography and flexible bronchoscopy (n = 2) Evidence C source
  Chili pepper fragments found obstructing distal airways in both, removed intact by cryoextraction, with residual bronchiectasis on follow-up

What is still unknown

• Pooling 14 case-control studies with 5,009 cancers, high chili pepper consumption carried higher odds of digestive-tract cancer (OR 1.64, 95% CI 1.00 to 2.70), and the direction flipped by continent, from OR 2.50 in Asia to OR 0.30 in Europe. — 11,310 participants including 5,009 gastrointestinal cancers in 14 case-control studies, stratified by cancer site and by region (n = 11310) Evidence C source
  All digestive-tract cancers OR 1.64 (95% CI 1.00 to 2.70), oesophageal OR 2.71 (1.54 to 4.75), Asia OR 2.50, Africa OR 1.62, North America OR 2.61, South America OR 0.50, Europe OR 0.30

The bottom line

Chili pepper looks protective in cohort data and harmful in case-control data, and both kinds of study only show association. Pooling 4 prospective cohorts with 564,748 adults, among whom 31,527 died of any cause, eating chili pepper ever or more than once a week went with a 13 percent lower rate of death from any cause (HR 0.87, 95% CI 0.85 to 0.90). Cardiovascular and cancer death were lower in the same direction, with almost no heterogeneity between the four. Exposure there is a yes or no answer rather than a measured amount, and people who choose chili differ from people who avoid it in ways no adjustment fully removes. Now the other pile. Across 13 case-control studies with 3,095 gastric cancers and 4,761 controls, moderate to high chili consumption carried odds of gastric cancer 1.96 times those of low consumption (OR 1.96, 95% CI 1.59 to 2.42). High consumption alone gave OR 2.28 (1.76 to 2.96), while moderate consumption alone gave OR 0.72 (0.36 to 1.41) and crossed 1. Those are odds and not risks, and case-control studies ask people who already have cancer to recall what they ate, which tilts the recall. A second pooling of 14 case-control studies, 11,310 people and 5,009 digestive-tract cancers, put the overall figure at OR 1.64 with a lower confidence bound sitting exactly on 1.00, and oesophageal cancer at OR 2.71 (1.54 to 4.75). The direction then reverses by region, from OR 2.50 in Asian studies to OR 0.30 in European ones. A result that flips like that is pointing at something beyond the pepper, or at a different pepper, or at a different way of eating it. The umbrella review that gathered 11 systematic reviews and 27 findings says the same thing in plain words. It calls the health effect of chili peppers unclear, with harm reported for cancers of the gullet, stomach and gallbladder and benefit reported for metabolism, mortality and cardiovascular disease. Nobody has run the trial that would settle which is which. Capsaicin capsules are a different product from the food, and the two trials here used capsules. In 24 overweight adults, a slow-release red chili extract delivering 4 mg of capsaicinoids a day for 28 days lowered body weight by 2.1 percent and body mass index by 2.2 percent against placebo. That trial ran 12 people per arm on a branded formulation, tested by people who work with it. In 44 women with gestational diabetes at 22 to 33 weeks, 42 of whom finished, 5 mg of purified capsaicin a day for 4 weeks left fewer large-for-gestational-age newborns than placebo (P = 0.022). That is one small short trial of a supplement, and in pregnancy the question belongs to whoever is providing the care. Two rarer cautions are worth naming because they are easy to miss. Chili sometimes acts as a true allergen. In a 19-year-old woman, a year of soreness and red patches on the tongue worsened after spicy food. Her skin prick test for chili was positive, her eosinophil count was 4 percent and her total IgE 698 IU/mL, and the diagnosis was chili-induced geographic tongue. She was treated by avoiding chili and with a mouthwash at the same time, so neither can take the credit alone. A dry fragment can also go down the wrong way. Two elderly patients were investigated for obstructive pneumonia or a tumour before bronchoscopy found chili pepper fragments blocking their small airways, and both were left with bronchiectasis after removal. One patient and two patients show that these things happen, and say nothing about how often. The iron finding is about one meal, and how much it matters depends on how much iron the rest of a person's diet delivers. We found nothing here on interactions with medicines, and no study of the canned entree that gives this page its USDA record.

Sources

1. chil-r1-01 · randomised crossover trial
   Addition of freeze-dried chili (4.2 g dry powder, 25 mg polyphenols as gallic acid equivalents) reduced Fe absorption from the meal by 38% (6.0% with chili vs. 9.7% without chili, P = 0.0017). Turmeric (0.5 g dry powder, 50 mg polyphenols as gallic acid equivalents) did not inhibit iron absorption (P = 0.91).
   J Nutr, 2006 · checked 2026-09-24
2. chil-r1-02 · meta-analysis of cohorts
   A total of 4 cohort studies (N=564,748; all four studies had adjusted for important potential confounders such as demographic variables, dietary intake, and physical activity) were ultimately included in this meta-analysis...Compared to none or rare consumption of chili pepper, consumption of chili pepper (ever or more than once a week) could significantly reduce the risk of all-cause mortality (summary adjusted HR: 0.87, 95% CI: 0.85, 0.90), CVD-specific mortality (summary adjusted HR: 0.89, 95% CI: 0.85, 0.93), and cancer-specific mortality (summary adjusted HR: 0.92, 95% CI: 0.88, 0.97).
   Int J Vitam Nutr Res, 2023 · checked 2026-09-24
3. chil-r1-06 · randomised controlled trial
   Twenty-four healthy overweight subjects were randomized into placebo (n = 12) and Capsifen (n = 12) groups and supplemented with 200 mg × 1/day of Capsifen (4 mg capsaicinoids/day) for 28 days...However, a significant decrease in body weight (2.1%), w/h ratio (4%) and body mass index (BMI) (2.2%) were observed among Capsifen group when compared to placebo.
   J Diet Suppl, 2021 · checked 2026-09-24
4. chil-r1-03 · meta-analysis of case-control studies
   13 studies (3,095 cases and 4,761 controls) were included in the meta-analysis. A 1.96-fold increased risk of GC was shown for the moderate-high chili consumption (OR = 1.96, 95%CI =1.59-2.42). Dose-response analysis showed a significant nonlinear association of GC risk with capsaicin intake (pnon-linearity <0.05) and suggested a significant positive association between high chili consumption and GC risk (OR = 2.28, 95%CI = 1.76-2.96) but not moderate chili consumption (OR = 0.72, 95%CI = 0.36-1.41).
   Nutr Cancer, 2021 · checked 2026-09-24
5. chil-r1-09 · case report
   A 19-year-old female patient complained of a rough and sore dorsal tongue for a year, particularly after consuming spicy food...The eosinophil count was 4%, the total IgE level was 698 IU/mL, and the skin prick test for chili was positive. The diagnosis of chili-induced GT was made.
   J Asthma Allergy, 2023 · checked 2026-09-24
6. chil-r1-07 · umbrella review
   Eleven systematic reviews and meta-analyses with a total of 27 findings are identified. The health effect of consuming spicy food and chili peppers is unclear. Furthermore, the characteristics and context of different world regions and populations should be carefully considered. Direct correlations exist in esophageal cancer, gastric cancer, and gallbladder cancer. However, negative connections are reported in metabolism, mortality, and cardiovascular disease.
   Mol Nutr Food Res, 2022 · checked 2026-09-24
7. chil-r1-05 · randomised controlled trial
   Forty-four pregnant women with GDM at 22-33 gestational weeks were randomly assigned to the capsaicin group (5 mg/d of capsaicin) or to the placebo group (0 mg/d of capsaicin) for 4 weeks in a randomized, double-blind, placebo-controlled trial...Furthermore, the incidence of large-for-gestational-age (LGA) newborns was significantly lower in the capsaicin group than in the placebo group (P = 0.022).
   Clin Nutr, 2016 · checked 2026-09-24
8. chil-r1-08 · case series
   We report two cases of elderly patients with subacute respiratory symptoms initially indicative of obstructive pneumonia or neoplasia...Flexible bronchoscopy identified chili pepper fragments obstructing the distal airways. Cryoextraction successfully removed specimens intact without fragmentation. Follow-up revealed residual bronchiectasis but significant symptomatic improvement.
   Front Med (Lausanne), 2026 · checked 2026-09-24
9. chil-r1-04 · meta-analysis of case-control studies
   The summary OR showed that high consumption of chili pepper was positively related to the risk of GI cancers (OR = 1.64; 95% CI: 1.00-2.70). A stronger positive relationship was observed between chili pepper consumption and EC risk (OR = 2.71; 95% CI: 1.54-4.75), but there was no statistically significant association between GC and CRC risk...In analyses stratified by geographical location, a positive association was found between chili pepper consumption and the risk of GI cancers in Asian studies (OR = 2.50; 95% CI: 1.23-5.08), African studies (OR = 1.62; 95% CI: 1.04-2.52), and North American studies (OR = 2.61; 95% CI: 1.34-5.08), but an inverse association was seen in South American studies (OR = 0.50; 95% CI: 0.29-0.87) and European studies (OR = 0.30; 95% CI: 0.15-0.61).
   Front Nutr, 2022 · checked 2026-09-24