Orange or sweet potato: two literatures that never met

No trial has put an orange against a sweet potato, so what follows is two separate bodies of evidence sharing one page. The orange side is juice, tested in adults in wealthy countries. Across ten randomised trials, orange juice lowered LDL cholesterol by 9.14 mg/dl (95% CI -15.79 to -2.49) and blood glucose by 2.92 mg/dl (95% CI -5.33 to -0.53), and both effects held in the subgroups drinking at least 500 ml a day. That dose is about 220 kcal of sugar every day, and body composition did not move in the same pooled analysis. When 37 centrally overweight men drank 330 ml a day for six weeks, the juice delivered as much hesperidin into the blood as a matched supplement did, and neither one changed how their arteries dilated. The sweet potato side comes from farming programmes in Africa. Growing orange-fleshed sweet potato cut the share of Ugandan children aged 6 to 35 months with inadequate vitamin A intake by more than 30 percentage points over two years, and the share with serum retinol below 1.05 micromol per litre fell by 9.5 points among the 396 children with complete data. Vitamin A deficiency was common there at the start, which is why the gain was that large.

How much is actually in it

• Across 67 post-harvest studies, provitamin A crops including orange sweet potato held high amounts of provitamin A compared with non-biofortified counterparts, while iron and zinc crops varied with the processing method. — conventionally bred biofortified maize, orange sweet potato, cassava, pearl millet, rice, beans and wheat in 67 articles (n = 67 articles) Evidence D source
  Provitamin A retention high relative to non-biofortified comparators; iron and zinc retention variable by processing method

What your body absorbs

• Daily 330 ml of orange juice for six weeks delivered as much hesperidin to the blood as a matched supplement did, and neither changed flow-mediated dilation in 37 centrally overweight men. — 37 centrally overweight men in a randomised double-blind three-period crossover trial, three 6-week interventions separated by washout (n = 37) Evidence B source
  Plasma AUC0-6 h of phase II hesperetin metabolites and 24 h urinary excretion comparable after orange juice and hesperidin beverage; no significant change in fasting or postprandial FMD versus control

What cooking and storage change

• Beta-carotene kept in orange sweet potato after cooking depends on packaging, temperature, oxygen and light during storage, and deep freezing at minus 80 degrees held cooked roots best. — orange sweet potato samples in post-harvest handling studies included in a systematic review of 67 articles on seven biofortified crops (n = 67 articles across seven crops) Evidence D source
  Direction only: packaging, temperature, oxygen and light govern beta-carotene retention during storage of processed orange sweet potato

What it does to your health

• Across ten randomised trials, orange juice lowered LDL cholesterol by 9.14 mg/dl and blood glucose by 2.92 mg/dl, with the effect holding in subgroups drinking at least 500 ml a day. — adults in 10 randomised controlled trials of orange juice, databases searched to September 2020 (n = 10 RCTs) Evidence A source
  LDL-C -9.14 mg/dl (95% CI -15.79 to -2.49); total cholesterol -9.84 mg/dl (95% CI -15.43 to -4.24); glucose -2.92 mg/dl (95% CI -5.327 to -0.530)
• Moro orange juice extract lowered body weight by 2.08 kg and fat mass by 1.53 kg in three randomised trials of 252 overweight adults. — 252 overweight and obese adults in 3 randomised controlled trials comparing Moro orange juice extract with placebo (n = 252) Evidence A source
  Body weight MD -2.08 kg (95% CI -3.50 to -0.67); fat mass MD -1.53 kg (95% CI -2.92 to -0.15); no effect on lean mass

Safety, limits and interactions

• Beta-carotene supplements did not lower death from any cause in 216,734 adults, and they raised lung cancer mortality by 14 percent. — 216,734 adults with any health condition in 31 randomised controlled trials, 108,622 on beta-carotene supplements and 108,112 on placebo or no intervention (n = 216734) Evidence A source
  All-cause mortality RR 1.02 (95% CI 0.98-1.05); lung cancer mortality RR 1.14 (95% CI 1.02-1.27)
• In 51 pharmacokinetic studies, grapefruit juice cut exposure to aliskiren and celiprolol by roughly 80 to 90 percent, and apple and orange juices had comparable effects on certain medications. — humans given fruit juice together with antihypertensive drugs, 51 studies, mostly open-label crossover trials, databases searched to June 2024 (n = 51 studies) Evidence A source
  AUC and Cmax of aliskiren and celiprolol reduced by approximately 80-90 percent with grapefruit juice; orange juice comparable for certain medications

What people believe that the data does not support

• The European Union register lists eight beta-carotene health claims and authorises none of them, including the claim that beta-carotene supports immunity under sun exposure. — regulatory decision on wording used on food labels in the European Union (n = 8 beta-carotene claims, 0 authorised) Evidence E source
  No effect size, this is a decision on evidence sufficiency
• The European Union register also rejected the claim that cryptoxanthin from orange juice strengthens the immune system and protects the body, so that wording cannot be used on a label. — regulatory decision on wording used on food labels in the European Union (n = 2 orange juice claims, 0 authorised) Evidence E source
  No effect size, this is a decision on evidence sufficiency

Who this works differently for

• Growing orange-fleshed sweet potato cut the share of Ugandan children aged 6 to 35 months with inadequate vitamin A intake by more than 30 percentage points over two years, and low serum retinol fell by 9.5 percentage points. — Ugandan farmer households over 2 years: children 6-35 months (n = 265), children 3-5 years (n = 578), women (n = 573); serum retinol measured in 891 children and 939 women (n = 265 children 6-35 mo, 578 children 3-5 y, 573 women) Evidence B source
  Inadequate vitamin A intake reduced by more than 30 percentage points in children 6-35 months and more than 25 points in women; serum retinol below 1.05 micromol/L reduced by 9.5 percentage points in children (n = 396)
• In rural Mozambique, orange sweet potato raised daily intake by 46 to 97 g and vitamin A intake by 254 to 492 micrograms of retinol activity equivalents, and it supplied 80 percent of the reference children's vitamin A. — rural Mozambican households, children 6-35 months, children 3-5.5 years and women, over one year (low intensity) or nearly three years (high intensity) of training (n = not reported in abstract) Evidence B source
  Net increase in orange sweet potato intake 46, 48 and 97 g/d and in vitamin A intake 263, 254 and 492 micrograms RAE/d for younger children, older children and women

What is still unknown

• Twenty-five studies found better micronutrient status from biofortified crops only where farm households grew them, mainly vitamin A from orange sweet potato, and the evidence for buying them or receiving them in schools and clinics is still missing. — 25 studies of biofortified crop consumption in real-world settings across four impact pathways, 21 of them in farmer households (n = 25 studies) Evidence C source
  Improvement in micronutrient status shown for farmer household production only; other three pathways not yet informed

The bottom line

In rural Mozambique the same crop raised daily sweet potato intake by 46 to 97 grams and vitamin A intake by 254 to 492 micrograms of retinol activity equivalents, depending on whether the group was young children, older children or women. It supplied 80 per cent of all the vitamin A the reference children took in. Intake there was measured by dietary survey rather than by blood, so the figure describes what reached the plate. A review of 25 studies found better micronutrient status only where farming households grew the crop themselves, mostly vitamin A from orange sweet potato, and reports that nothing is yet known about buying it or receiving it through schools and clinics. Those results are about programmes in places where vitamin A is short. They are not a reason for a well-fed shopper to pick one of these two foods over the other. On cooking there is direction and no numbers. A review of 67 post-harvest studies says packaging, temperature, oxygen and light govern how much beta-carotene survives storage of cooked orange sweet potato, with deep freezing at minus 80 degrees the best option tested, and all of it measured in laboratories rather than kitchens. The same review found provitamin A crops held high amounts against non-biofortified varieties of the same crop, which is a comparison with pale sweet potato and not with an orange. There is no USDA record under this pairing, so this page has no composition table and no portion size for either food. Caution here belongs to the concentrates rather than to the plate. Beta-carotene supplements did not lower death from any cause across 31 trials in 216,734 adults, at a risk ratio of 1.02 (95% CI 0.98 to 1.05). They raised lung cancer mortality by 14 per cent (RR 1.14, 95% CI 1.02 to 1.27), and the trials driving that signal gave capsule doses to smokers and asbestos workers. Nobody has shown the same for beta-carotene eaten in a sweet potato. Juice can also change how a drug is absorbed. In a review of 51 pharmacokinetic studies, grapefruit juice cut exposure to aliskiren and celiprolol by roughly 80 to 90 per cent, and orange juice appears there only as having comparable effects on certain medications, with no figure of its own and with the reviewers stating that clinical relevance remains unproven. The Moro orange extract that lowered body weight by 2.08 kg and fat mass by 1.53 kg in 252 overweight adults is a supplement, and those numbers do not transfer to a glass of juice. Beyond drugs and supplements, we found no evidence on either food for pregnancy or kidney disease, so this page cannot tell you anything about those. For children there are only the two African programmes above, run where vitamin A was already short, and nothing at all on either food for a child who is not. On labels, the European Union register lists eight beta-carotene health claims and authorises none of them, and it rejected the wording that cryptoxanthin from orange juice strengthens the immune system. Non-authorised means the evidence did not satisfy the assessment, which is not the same as a finding that the substance does nothing.

Sources

1. orsp-daily-r2-07 · systematic review of laboratory retention studies
   Here we conduct a systematic review identifying 67 articles examining the retention of micronutrients in conventionally bred biofortified maize, orange sweet potato, cassava, pearl millet, rice, beans and wheat. Provitamin A crops maintain high amounts compared with non-biofortified counterparts.
   Nat Food, 2023 · checked 2026-09-24
2. orsp-daily-r2-09 · randomised crossover trial
   Plasma exposure to phase II hesperetin metabolites (AUC0-6 h) and 24 h urinary excretion were comparable after OJ and HESP, indicating effective hesperidin delivery and limited matrix effects on bioavailability...Neither intervention significantly affected fasting or postprandial FMD, vascular, metabolic or anthropometric parameters, or oxylipin profiles versus CON.
   Food Funct, 2026 · checked 2026-09-24
3. orsp-daily-r2-06 · systematic review of laboratory retention studies
   Studies showed that packaging types along with other variables such as temperature, oxygen and light levels are critical to consider to maximize BC retention during storage in addition to the processing, such as boiling25,30, done on OSP before storage31–33. Whereas temperature data were not available from all studies, deep freezing at −80 °C was favourable for storing cooked OSP.
   Nat Food, 2023 · checked 2026-09-24
4. orsp-daily-r2-01 · meta-analysis of RCTs
   Pooled results demonstrated a significant effect of orange juice on glucose (WMD: -2.92 mg/dl, 95% CI: -5.327, -0.530, p = 0.017), insulin (WMD: -1.229 μU/ml, 95% CI: -2.083, -0.374, p = 0.005), HOMA-IR (WMD: -0.464, 95% CI: -0.747, -0.181, p = 0.001), total cholesterol (WMD: -9.84 mg/dl, 95% CI: -15.43, -4.24, p = 0.001), LDL-C (WMD: -9.14 mg/dl, 95% CI: -15.79, -2.49, p = 0.007), and CRP (WMD: -0.467 mg/l, 95% CI: -0.815, -0.120, p = 0.008) compared to control group...These lowering effects of glucose, HOMA-IR, total cholesterol, and LDL-C were robust in subgroups with orange juice consumption ≥500 ml/day.
   Crit Rev Food Sci Nutr, 2022 · checked 2026-09-24
5. orsp-daily-r2-08 · meta-analysis of RCTs
   Three RCTs involving 252 participants were included in our 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)
   Nutr Health, 2026 · checked 2026-09-24
6. orsp-daily-r2-02 · meta-analysis of RCTs
   In a random-effects meta-analysis of all 31 trials, beta-carotene supplements were found to have no preventive effect on mortality (risk ratio 1.02, 95% confidence interval 0.98-1.05, I 2 = 42%)...Instead, beta-carotene supplementation significantly increased the risk of lung cancer mortality (RR 1.14, 95% CI 1.02, 1.27, I 2 = 3%)
   Front Med (Lausanne), 2022 · checked 2026-09-24
7. orsp-daily-r2-03 · meta-analysis of pharmacokinetic studies
   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 %...Apple and orange juices have comparable effects on certain medications.
   Complement Ther Med, 2025 · checked 2026-09-24
8. orsp-daily-r2-10 · regulatory register entry
   POL-HC-6699 Beta-Carotene Beta-carotene helps to support immunity upon UV-radiation (sun exposure) Helps to maintain healthy immune responses upon UV-radiation (sun exposure) Helps to maintain physiological immune responses of the skin upon UV radiation (sun exposure) Non-authorised
   EU Register on nutrition and health claims, claim POL-HC-6699, snapshot 2026-09-21 · checked 2026-09-24
9. orsp-daily-r2-11 · regulatory register entry
   POL-HC-7000 Cryptoxanthin from orange juice (Cryptoxanthin from) orange juice participate to strengthen immune system. Clarification provided (Cryptoxanthin from) orange juice ensure antioxidant action / ensure protective effect on the organism. Non-authorised
   EU Register on nutrition and health claims, claim POL-HC-7000, snapshot 2026-09-21 · checked 2026-09-24
10. orsp-daily-r2-04 · randomised controlled effectiveness study
    The prevalence of inadequate vitamin A intake was reduced in the IP and RP groups compared with controls among children 6-35 mo of age (>30 percentage points) and women (>25 percentage points) (P < 0.01)...There was a 9.5 percentage point reduction in prevalence of serum retinol <1.05 μmol/L for children with complete data on confounding factors (n = 396; P < 0.05).
    J Nutr, 2012 · checked 2026-09-24
11. orsp-daily-r2-05 · randomised controlled effectiveness study
    The intervention resulted in significant net increases in OSP intakes (model 1: 46, 48 and 97 g/d) and vitamin A intakes (model 1: 263, 254 and 492 μg retinol activity equivalents/d) among the younger children, older children and women, respectively...OSP accounted for 47-60 % of all sweet potato consumed and, among reference children, provided 80 % of total vitamin A intakes.
    Br J Nutr, 2012 · checked 2026-09-24
12. orsp-daily-r2-12 · systematic review
    The review found evidence of an improvement in micronutrient status via Impact Pathway 4 (mainly in terms of vitamin A from orange sweet potato) in controlled interventions that involved the creation of demand, the extension of agriculture and promotion of marketing...ongoing and future research will help fully inform their potential along the other three Impact Pathways for scaling up.
    Nutrients, 2022 · checked 2026-09-24