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Caffeine intake rises among Korean adults as brewed coffee gains ground (opens in a new tab)

news-medical.net · 2026-11-04

Short answerEvidenceSource

Short answer

Mixed

Mixed.

One claim goes further than the study. 2 other points were not covered by the paper.

  • 2 supported
  • 1 overstated
  • 2 not covered

Checked against the study summary. The full text wasn't available, so some details couldn't be settled either way.

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Follow the evidence trail
1
2

NewsLink checks it

Mixed

One claim overstates the study. Two of five check out. Two claims the study doesn't address.

  • 2 supported
  • 1 overstated
  • 2 not covered
Open claim evidence
3
Then inspect each claim

Evidence layer

Claim by claim

Each claim gets a verdict. Expand it to see the evidence directly below.

5 claims in this story

Showing all 5 claimsChoose a verdict to focus the list.

Claim 1 of 5OverstatedThe odds of high caffeine intake rose over time, and high intake was more prevalent among working-age adults and men.View evidenceHide evidence

As statedabout 5% higher odds for each calendar year

Why this verdict

The temporal increase in odds of high caffeine intake is supported: OR = 1.05 per year. The profile also supports lower odds among adults ≥65 and higher adjusted odds specifically among women aged 30–44. However, the story broadens this to 'working-age adults and men'; the supplied profile does not support men generally having higher prevalence/odds, and its highlighted working-age association is for women aged 30–44. Thus the demographic part outruns the abstract evidence.

1

Study evidence

Mean daily beverage-derived caffeine intake among Korean adults increased between 2016 and 2024.β = 1.66 mg/day per year (95% CI, 1.05–2.27)

“Data were obtained from the 7-9th Korea National Health and Nutrition Examination Surveys.”
2

Study evidence

Women aged 30–44 had higher adjusted odds of high caffeine intake (≥400 mg/day) compared with other adults (aOR = 1.62; 95% CI, 1.21–2.16).aOR 1.62 (95% CI 1.21–2.16)

“examine demographic factors associated with high caffeine intake (≥400 mg/day).”
Claim 2 of 5Not coveredA nationwide study of nearly 49,000 Korean adults examined how beverage preferences, age, and sex influenced caffeine habits from 2016 to 2024.View evidenceHide evidence

As statednearly 49,000 adults

Why this verdict

The abstract-level profile supports a nationwide KNHANES analysis of Korean adults from 2016–2024 examining beverage-derived caffeine intake, beverage sources, and demographic correlates. However, the supplied abstract profile does not report the sample size, so the specific 'nearly 49,000 adults' magnitude cannot be verified at this depth. The wording 'influenced' is also stronger than the profile's mainly trend/descriptive/associational framing.

1

Study evidence

Mean daily beverage-derived caffeine intake among Korean adults increased between 2016 and 2024.β = 1.66 mg/day per year (95% CI, 1.05–2.27)

“Data were obtained from the 7-9th Korea National Health and Nutrition Examination Surveys.”
2

Study evidence

Coffee was consumed by 90.8% of caffeine consumers in the KNHANES sample.90.8% prevalence among caffeine consumers

“Caffeinated beverages were identified using beverage food codes and product information recorded in the dietary database and classified into five categories: coffee, tea, energy drinks, cola-type beverages, and cocoa-based beverages.”
Claim 3 of 5Not coveredThe study found that mean daily caffeine intake increased linearly over time, with a larger increase in men than in women and no significant change among adults aged 65 years or older.View evidenceHide evidence

As stated1.66 mg/day per calendar year overall; 2.2 mg/day/year in men; 1.1 mg/day/year in women

Why this verdict

The overall mean daily caffeine increase is supported by the abstract profile: β = 1.66 mg/day per year. But the abstract-level profile does not provide the sex-specific mean-intake trend estimates stated in the story, nor does it report a nonsignificant mean-intake trend among adults aged ≥65. Those subgroup trend details are therefore not verifiable from the supplied abstract profile.

1

Study evidence

Mean daily beverage-derived caffeine intake among Korean adults increased between 2016 and 2024.β = 1.66 mg/day per year (95% CI, 1.05–2.27)

“Data were obtained from the 7-9th Korea National Health and Nutrition Examination Surveys.”
Claim 4 of 5SupportedCoffee was the primary source of caffeine intake, and among caffeine consumers the share choosing brewed coffee increased while the share choosing coffee mixes declined.View evidenceHide evidence

As stated90.8% of caffeine consumers drank coffee

Why this verdict

The abstract profile supports coffee as the dominant caffeine source, reporting that coffee was consumed by 90.8% of caffeine consumers, and it supports a temporal shift from coffee mixes toward brewed coffee.

1

Study evidence

Coffee was consumed by 90.8% of caffeine consumers in the KNHANES sample.90.8% prevalence among caffeine consumers

“Caffeinated beverages were identified using beverage food codes and product information recorded in the dietary database and classified into five categories: coffee, tea, energy drinks, cola-type beverages, and cocoa-based beverages.”
Claim 5 of 5SupportedThe researchers suggested the shift from coffee mixes toward brewed coffee may partly explain the rise in high caffeine intake, but they did not directly establish that link.View evidenceHide evidence

Why this verdict

The profile's discussion-level summary says increasing caffeine intake was interpreted as driven largely by shifts in coffee consumption, while the methods are observational, repeated cross-sectional KNHANES analyses using 24-hour recall. The story appropriately hedges this as a suggested partial explanation and notes that the study did not directly establish the link.

1

Study evidence

Mean daily beverage-derived caffeine intake among Korean adults increased between 2016 and 2024.β = 1.66 mg/day per year (95% CI, 1.05–2.27)

“Data were obtained from the 7-9th Korea National Health and Nutrition Examination Surveys.”
2

Study evidence

Coffee was consumed by 90.8% of caffeine consumers in the KNHANES sample.90.8% prevalence among caffeine consumers

“Caffeinated beverages were identified using beverage food codes and product information recorded in the dietary database and classified into five categories: coffee, tea, energy drinks, cola-type beverages, and cocoa-based beverages.”
Then look for missing context

Context layer

What the story carried across

Nothing material from the study was dropped.

5 things the story did carry across
  • The paper's central finding is that mean daily beverage-derived caffeine intake increased from 2016 to 2024, with β = 1.66 mg/day per year.
  • The paper reports increasing odds of high caffeine intake, defined as ≥400 mg/day, with OR = 1.05 per calendar year.
  • Coffee was the dominant caffeine source, consumed by 90.8% of caffeine consumers, with a shift from coffee mixes toward brewed coffee.
  • Caffeine exposure and high-intake classification were based on beverage-derived intake estimated from a single 24-hour dietary recall, so the measure may not represent habitual total caffeine intake.
  • The study used observational, repeated cross-sectional survey data and survey-weighted regression, so causal claims about coffee-type shifts producing higher caffeine intake require caution.
Then read the study layer

Study layer

Study at a glance

Scan the study first. Expand only the parts you want to inspect.

Pieces of work

3

Evidence read

study summary

Lead result

secondary data

1Lead resultsecondary dataQuantify temporal trends (2016–2024) in beverage-derived caffeine intake among Korean adults, including changes in mean intake and prevalence/odds of high intake (≥400 mg/day).Survey-weighted trend analysis of KNHANES 7th–9thExpand

In plain English

Nationally representative analysis of beverage-derived caffeine intake in Korean adults (KNHANES 7th–9th, 2016–2024) using 24-h dietary recall and beverage-specific caffeine concentration linkage. Survey-weighted linear regression showed mean daily caffeine intake increased over time; survey-weighted logistic regression showed increasing odds of high intake (≥400 mg/day). Coffee was the dominant source with a shift toward brewed coffee. Working-age women had elevated odds of high intake while older adults had lower odds.

Key findings

  • Mean daily beverage-derived caffeine intake among Korean adults increased between 2016 and 2024.β = 1.66 mg/day per year (95% CI, 1.05–2.27)
  • The odds of high caffeine intake (≥400 mg/day) increased over time.OR = 1.05 per year (95% CI, 1.02–1.07)
“Data were obtained from the 7-9th Korea National Health and Nutrition Examination Surveys.”
2secondary dataCharacterize the major beverage sources of caffeine and how source composition (e.g., coffee types) has shifted over time.secondary data; cross-sectional dietary assessment (KNHANES 7–9, 2016–2024)Expand

In plain English

Using 24-h dietary recall data from KNHANES (2016–2024), caffeinated beverages were categorized into five groups (coffee, tea, energy drinks, cola-type, cocoa-based). Coffee was the dominant source (consumed by 90.8% of caffeine consumers) and the composition of coffee consumption shifted over time from coffee mixes toward brewed coffee.

Key findings

  • Coffee was consumed by 90.8% of caffeine consumers in the KNHANES sample.90.8% prevalence among caffeine consumers
  • Caffeinated beverages were categorized into five groups: coffee, tea, energy drinks, cola-type beverages, and cocoa-based beverages.
“Caffeinated beverages were identified using beverage food codes and product information recorded in the dietary database and classified into five categories: coffee, tea, energy drinks, cola-type beverages, and cocoa-based beverages.”
What this piece can’t prove

2 further details could not be confirmed from the summary.

3secondary dataIdentify demographic factors associated with high caffeine intake (≥400 mg/day), including age/sex patterns.Survey-weighted multivariable logistic regression (cross-sectional analysis of KNHANES 2016–2024)Expand

In plain English

Using nationally representative KNHANES data (2016–2024) among adults ≥19 with valid 24-h dietary recall, the authors modeled demographic correlates of high caffeine intake (defined as ≥400 mg/day from beverages) using survey-weighted multivariable logistic regression. They report that women aged 30–44 had higher adjusted odds of high caffeine intake (aOR = 1.62; 95% CI, 1.21–2.16), while adults aged ≥65 had lower odds (men: aOR = 0.37; 95% CI, 0.25–0.53; women: aOR = 0.23; 95% CI, 0.12–0.44).

Key findings

  • Women aged 30–44 had higher adjusted odds of high caffeine intake (≥400 mg/day) compared with other adults (aOR = 1.62; 95% CI, 1.21–2.16).aOR 1.62 (95% CI 1.21–2.16)
  • Adults aged ≥65 had lower adjusted odds of high caffeine intake; reported sex-specific estimates: men aOR = 0.37 (95% CI, 0.25–0.53) and women aOR = 0.23 (95% CI, 0.12–0.44).men aOR 0.37 (95% CI 0.25–0.53); women aOR 0.23 (95% CI 0.12–0.44)
“examine demographic factors associated with high caffeine intake (≥400 mg/day).”
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Papers considered

The selected paper, plus nearby candidates.

PubMed, Europe PMC, Crossref · 15 candidate papers

Candidate

A Randomized, Two-Way Crossover Study to Evaluate the Pharmacokinetics of Caffeine Delivered Using Caffeinated Chewing Gum Versus a Marketed Caffeinated Beverage in Healthy Adult Volunteers

Journal of Caffeine Research · 2017 · Crossref

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And 9 more candidates considered.