Fruit juice: still free sugar to WHO, with a caution on medicines

WHO counts the sugar naturally in juice as free sugar, the category that also holds sugar added by a cook or a factory. A mixed juice in UK tables has 10.3 g of sugars and 0.8 g of fiber per 3.5 oz (100 g), and a US juice box weighs 7.4 oz (209 g). In a meta-analysis of 169 controlled feeding trials with 10,357 people, studies that added 100% fruit juice at up to 10% of daily energy reported lower body weight, while sugar-sweetened drinks raised it. The abstract gives no size for the juice effect, so this does not show that juice helps weight loss. A second meta-analysis, 147 trial comparisons in 5,213 adults, found fruit and 100% juice at that same low dose led to small reductions in blood pressure, with fruit and juice pooled together. In cohort studies of 45,851 children, each extra daily serving of 100% juice was linked with a 0.03 higher change in BMI, 95% CI 0.01 to 0.05. Juice can also change blood levels of some medicines. In a trial on 10 healthy adults, 1.3 quarts (1.2 L) of grapefruit, orange or apple juice over three hours cut the allergy drug fexofenadine to 30 to 40% of the levels seen with water.

As people eat it, per 3.5 oz (100 g)

How much is actually in it

• Mixed fruit juice in UK food tables has 40 calories, 10.3 g sugars and 0.8 g fiber per 3.5 oz (100 g). — — Evidence C source
  Per 100 g: 40 calories; carbohydrate 10.3 g, all sugars; AOAC fiber 0.8 g; protein 0.4 g

What a real portion looks like

• In USDA survey portion data, a 6.75 fl oz juice box of 100% fruit juice blend weighs 7.4 oz (209 g) and an unspecified serving 8.7 oz (248 g). — — Evidence C source
  Juice box/pouch 6.75 fl oz = 209 g; fun size box 4.23 fl oz = 131 g; quantity not specified = 248 g

What your body absorbs

• A meta-analysis of 15 RCTs (1,381 females and children) found vitamin C-rich fruits or juices with meals probably raise serum ferritin by 9.39 ug/L and hemoglobin by 1.34 g/L, with little effect on iron absorption. — females aged 15-74 y and children (n = 1381) Evidence A source
  Serum ferritin MD 9.39 ug/L (moderate certainty); hemoglobin MD 1.34 g/L; iron absorption MD 3.36%, P = 0.07 (low certainty)

What it does to your health

• A 2024 meta-analysis of 19 randomized trials in adults found that drinking 100% fruit juice did not change body weight compared with non-caloric drinks, with a wide uncertainty range. — adults in RCTs of at least 2 weeks; 100% fruit juice vs non-caloric controls (n = 19 RCTs) Evidence A source
  MD -1.2 lb (95% CI -3.4 to 1.1; metric: -0.53 kg, -1.55 to 0.48)
• In adult cohorts from the 2024 meta-analysis, fruit juice was linked to 0.46 lb (0.21 kg) more weight gain only in studies that did not account for total calories. — adults in 6 prospective cohorts (n = 6 cohorts) Evidence C source
  0.46 lb (0.33 to 0.6; metric: 0.21 kg, 0.15 to 0.27) unadjusted for energy vs -0.18 lb (-0.24 to -0.11; metric: -0.08 kg, -0.11 to -0.05) energy-adjusted
• A 2021 meta-analysis of 11 trials with 512 adults found orange juice or hesperidin had no effect on body weight, BMI or body fat. — adults in RCTs of orange juice and/or hesperidin supplementation (n = 11 RCTs, 512 individuals) Evidence A source
  Body weight WMD -0.68 lb (95% CI -3.2 to 1.8; metric: -0.31 kg, -1.44 to 0.82); BMI WMD 0.11 kg/m2 (-0.33 to 0.56)
• In a crossover trial of 26 healthy adults drinking orange juice or cola at 20% of energy for 2 weeks each, body weight did not change with either drink. — healthy adults, mean age 24.7, BMI 23.2; orange juice or caffeine-free cola between 3 meals a day, ad libitum energy (n = 26) Evidence B source
  Body weight unchanged in both 2-week periods
• A meta-analysis of 169 controlled feeding trials in 10,357 people found 100% fruit juice added at up to 10% of energy decreased body weight, while sugar-sweetened beverages increased it. — participants of controlled feeding trials >=2 wk, median 12 wk (n = 10357) Evidence A source
  Total fructose-containing sugars +0.62 lb (0.28 kg) in addition trials; 100% fruit juice (<=10%E) decreased weight in addition trials; GRADE generally moderate
• A meta-analysis of 147 trial comparisons in 5,213 adults found fruit and 100% fruit juice at up to about 10% of energy led to small reductions in blood pressure. — adults with and without hypertension or at risk for hypertension (n = 5213) Evidence A source
  Small but important reductions in systolic and diastolic BP at <=~10% energy; certainty generally moderate

Safety, limits and interactions

• The American Academy of Pediatrics warns that the high sugar in juice adds calories and raises the risk of tooth decay in children. — infants, children and adolescents Evidence E source
  More calories and dental caries risk; lack of protein and fiber may predispose to inappropriate weight gain
• In a crossover RCT on 10 adults, grapefruit, orange and apple juice cut blood levels of the allergy drug fexofenadine to 30-40% of those with water. — healthy subjects, 120 mg fexofenadine with 1.3 quarts (1.2 L) juice over 3 hours (n = 10) Evidence B source
  AUC, Cmax and urinary excretion 30% to 40% of water values
• In a crossover RCT on 12 adults, a normal 10 fl oz (300 mL) glass of grapefruit juice cut fexofenadine exposure to 58% of that with water. — healthy volunteers, 120 mg fexofenadine (n = 12) Evidence B source
  AUC 58% and Cmax 53% of water at 10 fl oz (300 mL); 36% and 33% at 41 fl oz (1200 mL)
• In a crossover RCT on 11 adults, taking ciprofloxacin with a calcium-containing fruit juice instead of water lowered its relative availability by 35.75%. — healthy volunteers, 500 mg ciprofloxacin with 8.5 fl oz (250 ml) water or juice (n = 11) Evidence B source
  Relative availability -35.75%
• A meta-analysis of 51 studies found grapefruit juice cut blood levels of the blood pressure drugs aliskiren and celiprolol by about 80-90%. — humans in pharmacokinetic studies, mostly open-label crossover (n = 51 studies) Evidence C source
  AUC and Cmax of aliskiren and celiprolol down ~80-90%; clinical relevance uncertain
• FDA says children, older adults, pregnant women and people with weakened immune systems risk serious illness or even death from drinking untreated juice. Packaged untreated juice must carry a warning label, but juice sold by the glass, as at juice bars and roadside stands, does not need one. — children, older adults, pregnant women and people with weakened immune systems Evidence E source
  Untreated juice can cause serious illness or death in these groups; packaged untreated juice must carry a warning label, juice sold by the glass need not

What people believe that the data does not support

• A 2023 meta-analysis of 169 controlled feeding trials found that 100% fruit juice added at up to 10% of energy did not raise body weight, unlike sugar-sweetened drinks. — controlled feeding trials of at least 2 weeks; 14 food sources of fructose-containing sugars (n = 169 trials, 10,357 participants) Evidence A source
  Addition trials: 100% fruit juice (<=10% energy) decreased body weight; SSBs and fruit drinks increased; GRADE generally moderate
• A 2026 meta-analysis of 3 trials with 252 adults found Moro orange juice extract capsules cut weight by about 4.4 lb (2 kg), but this is a concentrated supplement, not juice. — overweight and obese adults; Moro orange juice extract vs placebo (n = 3 RCTs, 252 participants) Evidence A source
  Body weight MD -4.6 lb (95% CI -7.7 to -1.5; metric: -2.08 kg, -3.50 to -0.67), I2 0%; fat mass MD -3.4 lb (-1.53 kg)
• The 2024 Nordic Nutrition Recommendations review concluded that the link between fruit juice and weight gain remains unclear and may matter for some groups. — systematic reviews and meta-analyses on fruit juice and health outcomes Evidence C source
  Association with weight gain unclear; low to moderate intake not linked to chronic disease
• WHO counts the sugars naturally present in fruit juices as free sugars, the kind its guideline asks people to limit. — adults and children Evidence E source
  Fruit juice sugars classed as free sugars
• The EU did not authorize the claim that a diet rich in fruits, including juiced fruit, helps manage body weight. — — Evidence E source
  Claim status: non-authorized
• WHO counts sugars naturally present in fruit juices and juice concentrates as free sugars, the same category as added sugar. — adults and children Evidence E source
  Fruit juice sugars fall under the free-sugars limit
• Under US labeling rules a product with concentrated fruit juice as an ingredient cannot claim no sugar added. — — Evidence E source
  Concentrated fruit juice counts as an ingredient containing added sugars

Who this works differently for

• In the same 2024 meta-analysis, cohorts of 45,851 children linked each extra daily serving of 100% fruit juice with a small BMI gain of 0.03. — children in 17 prospective cohorts, median age 8 years (n = 17 cohorts, 45,851 children) Evidence C source
  Beta 0.03 (95% CI 0.01 to 0.05) higher BMI change per serving per day
• In a 12-week trial of 78 adults with obesity on a reduced-calorie diet, adding 17 fl oz (500 mL) of orange juice a day did not slow weight loss, about 14 lb (6.5 kg) in both groups. — obese adults, mean age 36, BMI 33; reduced-calorie diet with or without 500 mL/d 100% orange juice (n = 78) Evidence B source
  Body weight -14 lb (-6.5 kg) in both groups (P = 0.363); BMI -2.5 kg/m2
• Cohort data from 17 studies in 45,851 children link each daily serving of 100% fruit juice with a 0.03 higher BMI change. — children in prospective cohort studies (n = 45851) Evidence C source
  BMI change +0.03 (95% CI 0.01-0.05) per serving per day
• A WHO-commissioned review of 60 studies in children up to 10.9 years found 100% fruit juice made little or no difference to BMI or body fat, with low certainty. — children aged <=10.9 y at exposure (n = 60 studies) Evidence C source
  Little/no difference in BMI, % body fat or overweight (low certainty)

What is still unknown

• A systematic review of reviews found tooth decay in children and small weight gain as the only consistent risks of 100% fruit juice, with no conclusive evidence of other harm. — children and adults, systematic reviews and meta-analyses Evidence C source
  Increased caries in children; small weight gain in young children and adults
• The Nordic Nutrition Recommendations 2023 review judged the link between fruit juice and weight gain unclear and the overall evidence on health effects limited. — systematic reviews and meta-analyses Evidence C source
  Low to moderate intake not associated with chronic disease risk; weight effect unclear

The bottom line

That child signal is small and observational. A WHO-commissioned review of 60 studies in children up to 10.9 years, 59 of them observational, found juice made little or no difference to BMI or body fat, with low certainty. A review of reviews names tooth decay in children and small weight gain in young children and adults as the consistent risks, with no conclusive evidence of other harm. The Nordic Nutrition Recommendations 2023 review called the weight link unclear and the evidence on health effects limited. Juice with a meal may help iron status. A meta-analysis of 15 RCTs in 1,381 females and children found vitamin C-rich fruits or juices eaten with meals probably raise serum ferritin and hemoglobin, with little to no effect on iron absorption itself. Fruits and juices were pooled there too. The firm caution is medicines. In 10 healthy adults, 1.3 quarts (1.2 L) of grapefruit, orange or apple juice over three hours cut blood levels of the allergy drug fexofenadine to 30 to 40% of those with water. A normal 10 fl oz (300 mL) glass of grapefruit juice cut its exposure to 58% in a trial on 12 volunteers. Taking the antibiotic ciprofloxacin with one branded juice containing calcium, instead of water, lowered its relative availability by 35.75% in 11 volunteers. Across 51 pharmacokinetic studies, grapefruit juice cut blood levels of the blood pressure drugs aliskiren and celiprolol by about 80 to 90%. How much that matters clinically is uncertain, since blood pressure itself was rarely measured. The same review describes grapefruit juice as an inhibitor of the drug-handling enzyme CYP3A4, and the drugs named on this page are only the ones these studies tested. If you take any prescription medicine, ask whoever prescribed it about juice, grapefruit juice above all. Under US labeling rules a product containing concentrated fruit juice cannot claim no sugar added. The EU refused the claim that a diet rich in fruits, juiced fruit included, helps manage body weight. We found no data on what processing or storage does to the nutrients in juice.

Sources

1. frj-daily-r8-01 · dataset
   Fruit juice, mixed (CoFID 17-746): Energy 40 kcal per 100 g; Carbohydrate 10.3 g; Total sugars 10.3 g; AOAC fibre 0.8 g; Protein 0.4 g; Water 88.5 g
   CoFID 2021 (Public Health England), code 17-746, Fruit juice, mixed · checked 2026-09-29
2. frj-daily-r8-02 · dataset
   Fruit juice blend, 100% juice (FNDDS 64100110, fdc_id 2709316, WWEIA Other fruit juice): 1 fun size box (4.23 fl oz) 131 g; 1 juice box/pouch (6.75 fl oz) 209 g; 1 individual school container 124 g; Quantity not specified 248 g
   USDA FNDDS 2021-2023, food code 64100110, FDC 2709316 · checked 2026-09-29
3. frj-daily-r8-03 · meta-analysis
   After screening 2594 unique records, 15 RCTs (n = 1381; 806 interventions, 575 controls) met inclusion criteria. ... Consuming ascorbate-rich fruits or juices with meals probably increases serum ferritin and hemoglobin concentrations and slightly reduces serum transferrin receptors but shows little to no effect on iron absorption, plasma ferritin, or body iron stores.
   Am J Clin Nutr, 2026 · checked 2026-09-29
4. ev-fjw-01 · meta-analysis
   RCTs in adults found no significant association of assignment to 100% fruit juice with body weight but the CI was wide (MD, -0.53 kg; 95% CI, -1.55 to 0.48 kg).
   JAMA Pediatrics, 2024, 178(3):237-246 (Nguyen et al.) · checked 2026-10-07
5. ev-fjw-03 · meta-analysis of cohorts
   Among cohort studies in adults, studies that did not adjust for energy showed greater body weight gain (0.21 kg; 95% CI, 0.15-0.27 kg) than studies that did adjust for energy intake (-0.08 kg; 95% CI, -0.11 to -0.05 kg; P for meta-regression <.001).
   JAMA Pediatrics, 2024, 178(3):237-246 (Nguyen et al.) · checked 2026-10-07
6. ev-fjw-05 · meta-analysis
   The meta-analysis showed that orange juice and/or hesperidin had no significant effect on body weight [weighted mean difference (WMD) = -0.31 kg; 95% CI, -1.44 to 0.82, P = 0.592], body mass index [WMD = 0.11 kg/m2; 95% CI, -0.33 to 0.56, P = 0.617], fat mass [WMD = 0.14 kg; 95% CI, -0.95 to 1.22, P = 0.807], percentage body fat [WMD = -0.70%; 95% CI, -2.58 to 1.18, P = 0.463] and waist circumference [WMD = 0.07 cm; 95% CI, -1.16 to 1.30, P = 0.588].
   Clin Nutr ESPEN, 2021 · checked 2026-10-07
7. ev-fjw-07 · RCT
   Fecal microbiota, body weight, basal and OGTT-derived insulin sensitivity remained unchanged in both intervention periods.
   Clin Nutr, 2019 · checked 2026-10-07
8. frj-daily-r8-04 · meta-analysis of controlled trials
   We included 169 trials (255 trial comparisons, n = 10,357) assessing 14 food sources at 4 energy control levels over a median 12 wk. ... addition trials [dried fruits, honey, fruits (≤10%E), and 100% fruit juice (≤10%E) decreased; SSBs, fruit drink, and mixed sources (with SSBs) increased]
   Am J Clin Nutr, 2023 · checked 2026-09-29
9. frj-daily-r8-05 · meta-analysis of controlled trials
   We included 93 reports (147 trial comparisons, N = 5,213) assessing 12 different food sources across 4 energy control levels in adults with and without hypertension or at risk for hypertension. ... The evidence provides a good indication that fruit and 100% fruit juice at low doses (up to or less than the public health threshold of ~10% E) lead to small, but important reductions in BP
   PLoS One, 2023 · checked 2026-09-29
10. ev-fjw-10 · guideline
    High sugar content in juice contributes to increased calorie consumption and the risk of dental caries.
    Pediatrics, 2017 · checked 2026-10-07
11. frj-daily-r8-08 · RCT (crossover)
    The oral pharmacokinetics of 120 mg fexofenadine was assessed with water, 25%-strength grapefruit juice, or normal-strength grapefruit, orange, or apple juices (1.2 L over 3 hours) in a randomized 5-way crossover study in 10 healthy subjects. ... Grapefruit, orange, and apple juices decreased the fexofenadine area under the plasma concentration-time curve (AUC), the peak plasma drug concentration (C(max)), and the urinary excretion values to 30% to 40% of those with water
    Clin Pharmacol Ther, 2002 · checked 2026-09-29
12. frj-daily-r8-09 · RCT (crossover)
    Grapefruit juice or water at normal (300 mL) or high (1200 mL) volume was ingested concomitantly with 120 mg fexofenadine by 12 healthy volunteers in a randomized 4-way crossover study, and fexofenadine pharmacokinetics were determined over a period of 8 hours. RESULTS: The 300-mL volume of grapefruit juice decreased the mean area under the plasma drug concentration-time curve (AUC) and the peak plasma drug concentration of fexofenadine to 58% (P < .001) and 53% (P < .001), respectively, of those with the corresponding volume of water
    Clin Pharmacol Ther, 2005 · checked 2026-09-29
13. frj-daily-r8-10 · RCT (crossover)
    For the in-vivo study, eleven (5 males and 6 females) healthy volunteers participated in an open, single dose, cross-over randomized trial. ... There was a decrease in relative availability of the drug by 35.75%.
    Nig Q J Hosp Med, 2007 · checked 2026-09-29
14. frj-daily-r8-11 · meta-analysis
    Fifty-one studies were included. Most of them were open-label crossover trials. Grapefruit juice (GFJ), an inhibitor of organic-anion-transporting polypeptide (OATP) transporters and cytochrome P450 (CYP) 3A4, significantly decreased the AUC and Cmax of aliskiren and celiprolol by approximately 80-90 %.
    Complement Ther Med, 2025 · checked 2026-09-29
15. sf-juice-r6-4 · agency advice
    While most people’s immune systems can usually fight off the effects of foodborne illness, children, older adults, pregnant women, and people with weakened immune systems (such as transplant patients and individuals with HIV/AIDS, cancer, or diabetes) risk serious illnesses or even death from drinking untreated juices. ... These untreated products should be kept under refrigeration and are required to carry the following warning on the label: WARNING: This product has not been pasteurized and therefore may contain harmful bacteria that can cause serious illness in children, the elderly, and persons with weakened immune systems. However, FDA does not require warning labels for juice or cider that is sold by the glass – for example, at apple orchards, farmers’ markets, roadside stands, juice bars, and some restaurants.
    U.S. FDA, What You Need to Know About Juice Safety, content current as of 03/05/2024 · checked 2026-10-08
16. ev-fjw-04 · meta-analysis
    There was interaction/influence by food sources on body weight: substitution trials [fruits decreased; added nutritive sweeteners and mixed sources (with SSBs) increased]; addition trials [dried fruits, honey, fruits (≤10%E), and 100% fruit juice (≤10%E) decreased; SSBs, fruit drink, and mixed sources (with SSBs) increased]; subtraction trials [removal of mixed sources (with SSBs) decreased]; and ad libitum trials [mixed sources (with/without SSBs) increased].
    Am J Clin Nutr, 2023 · checked 2026-10-07
17. ev-fjw-08 · meta-analysis
    The extract significantly reduced body weight (mean difference (MD) -2.08 kg; 95% confidence interval (CI) -3.50, -0.67; I2 = 0%; p < 0.01) and fat mass (MD -1.53 kg; 95% CI -2.92, -0.15; I2 = 0%; p = 0.03), the pooled analysis of waist circumference presented heterogeneous point estimates (MD -3.25 kg; 95% CI -6.44, -0.07; I2 = 99%; p = 0.05).
    Nutr Health, 2026 · checked 2026-10-07
18. ev-fjw-09 · scoping review
    The association between the intake of fruit juice and weight gain remains unclear and might be of concern for some groups of people.
    Food Nutr Res, 2024 · checked 2026-10-07
19. ev-fjw-11 · agency guideline
    Free sugars include monosaccharides and disaccharides added to foods and beverages by the manufacturer, cook or consumer, and sugars naturally present in honey, syrups, fruit juices and fruit juice concentrates
    WHO, Guideline: sugars intake for adults and children, 2015 · checked 2026-10-07
20. frj-daily-r8-12 · EU claim register
    POL-HC-7145 Fruits (fresh, frozen, canned, bottled, dried, juiced) A diet rich in fruits helps to manage body weight Non-authorised
    EU Register on nutrition and health claims, claim POL-HC-7145, snapshot 2026-09-21 · checked 2026-09-29
21. frj-daily-r8-13 · guideline
    Free sugars include monosaccharides and disaccharides added to foods and beverages by the manufacturer, cook or consumer, and sugars naturally present in honey, syrups, fruit juices and fruit juice concentrates
    WHO, Guideline: sugars intake for adults and children, 2015 · checked 2026-09-29
22. frj-daily-r8-14 · regulation
    (ii) The product does not contain an ingredient containing added sugars such as jam, jelly, or concentrated fruit juice; and
    21 CFR 101.60, Nutrient content claims for the calorie content of foods · checked 2026-09-29
23. ev-fjw-02 · meta-analysis of cohorts
    Among cohort studies in children, each additional serving per day of 100% fruit juice was associated with a 0.03 (95% CI, 0.01-0.05) higher BMI change.
    JAMA Pediatrics, 2024, 178(3):237-246 (Nguyen et al.) · checked 2026-10-07
24. ev-fjw-06 · RCT
    Both treatments had similar outcomes regarding body weight (-6.5 kg; P = 0.363), BMI (-2.5 kg/m2; P = 0.34), lean mass (-1 kg; P = 0.29), fat mass (-5 kg; P = 0.58), body fat (-3%; P = 0.15), and waist-to-hip ratio (-0.1; P = 0.79).
    Nutrition, 2017 · checked 2026-10-07
25. frj-daily-r8-06 · meta-analysis of cohorts
    Among cohort studies in children, each additional serving per day of 100% fruit juice was associated with a 0.03 (95% CI, 0.01-0.05) higher BMI change.
    JAMA Pediatrics, 2024 · checked 2026-09-29
26. frj-daily-r8-07 · systematic review
    Of 26,542 identified citations, 60 studies from 71 articles were included. Most studies were observational (59/60), and no included studies were from low-income countries. ... Artificially sweetened beverages and 100% fruit juice consumption make little/no difference to BMI, percentage body fat, or overweight/obesity outcomes (low certainty of evidence).
    Adv Nutr, 2022 · checked 2026-09-29
27. frj-daily-r8-15 · systematic review
    Aside from increased risk of tooth decay in children and small amounts of weight gain in young children and adults, there is no conclusive evidence that consumption of 100% fruit juice has adverse health effects.
    Adv Nutr, 2018 · checked 2026-09-29
28. frj-daily-r8-16 · scoping review
    The association between the intake of fruit juice and weight gain remains unclear and might be of concern for some groups of people. Overall, the evidence regarding health effects of fruit juice is limited.
    Food Nutr Res, 2024 · checked 2026-09-29