How many oranges a day is too much?

One orange = 1 fruit (4.9 oz, 140 g). USDA FoodData Central, Oranges, raw, navels. Limits count everything you eat and drink that day, so other foods and supplements use up part of each one.

Each row is a separate USDA analysis of the same food. The spread comes from variety, growing conditions and sampling, and it changes the answer.

• Level A Across 10 randomized trials pooled in 2022, orange juice lowered fasting glucose by 2.92 mg/dl, total cholesterol by 9.84 mg/dl and LDL cholesterol by 9.14 mg/dl compared with control, and those effects held mainly where people drank 17 fl oz (500 ml) a day or more. Crit Rev Food Sci Nutr, 2022
• Level B In an RCT in 62 adults with MASLD, eating 14 oz (400 g) of whole oranges daily for 4 weeks cut steatosis prevalence to 70.9% versus 100% with non-citrus fruit, without weight change. Nutrients, 2024
• Level B In a 3-period crossover RCT in 37 centrally overweight men, 11 fl oz (330 mL) orange juice daily for 6 weeks delivered hesperidin as well as a 210 mg supplement but did not change flow-mediated dilation. Food Funct, 2026
• Level B In 37 women on a controlled 5-week diet that included one glass of orange juice, half an orange and half a mandarin daily, plasma hesperetin rose from 12 to 325 nmol/L. It was detectable in only 54% of samples, so blood levels are a poor guide to how much citrus a person eats. Eur J Clin Nutr, 2002

Only studies that give the amount eaten. Levels: A is a meta-analysis of trials, B a randomized trial, C an observational study. How we grade evidence.

• Level C A reported case of anaphylaxis to mandarin showed IgE to the lipid transfer proteins of both mandarin (Cit r 3) and orange (Cit s 3), so a person allergic to one of these fruits can react to the other. Int Arch Allergy Immunol, 2007
• Level D A case report describes serum potassium of 9.4 mmol/L in a man with normal kidneys after weeks of drinking large volumes of reconstituted dried orange juice powder. Cureus, 2026
• Level E National Kidney Foundation, potassium in kidney disease: Orange (1 medium-sized) (listed under: Foods that are HIGHER in potassium (More than 200 mg of potassium per serving)) National Kidney Foundation, accessed 2026-10-12

If you have kidney disease, take blood thinners or other medicines, or are pregnant, the right amount for you is a question for your clinician.

Vitamin C is the nutrient people worry about, and oranges come nowhere near its 2,000 mg adult upper limit. It would take about 24 oranges. High doses of vitamin C can cause diarrhea, nausea and cramps, according to NIH (Level E). For children the upper limit is lower, from 400 mg depending on age.

In 62 adults with fatty liver disease, 14 oz (400 g) of whole oranges a day for 4 weeks lowered steatosis prevalence without weight change (Level B).

The National Kidney Foundation lists one medium orange among foods higher in potassium, more than 200 mg per serving. If you follow a potassium-limited diet for kidney disease, count it that way.

Evidence behind this note

1. Level E The ODS notes high vitamin C doses can cause diarrhea, nausea and cramps, and sets the upper intake level at 400 to 2,000 mg a day depending on age. NIH Office of Dietary Supplements, Vitamin C Fact Sheet for Health Professionals
2. Level B In an RCT in 62 adults with MASLD, eating 14 oz (400 g) of whole oranges daily for 4 weeks cut steatosis prevalence to 70.9% versus 100% with non-citrus fruit, without weight change. Nutrients, 2024

Written from the data and studies on this page, reviewed by the Bioma editorial system. How we verify.

• Oranges: full nutrition facts
• Can you get too much vitamin C?
• Can you get too much calcium?