Benefits
Smaller blood sugar rise when pear is eaten before a rice meal
In a crossover meal test in 14 healthy young women, about 240 g of Asian pear eaten 30 minutes before rice lowered the peak glucose rise and glucose swings compared with water before rice, even when the pear added carbohydrate. Apple worked best of the three fruits tested, with pear between apple and orange. These were single meals, not daily use.
Waist size and leptin with two fresh pears a day
In a 12-week open-label crossover in 40 adults aged 45 to 65 with metabolic syndrome, two medium pears a day gave a lower waist-to-hip ratio and lower leptin than a calorie-matched control drink; waist size was lower than control at 6 weeks. The differences were small (under 1 cm of waist). The pear industry helped fund the trial.
Body weight when three pears a day are added to the diet
In a 10-week trial in 49 Brazilian women with overweight, adding three pears a day lowered energy intake and body weight (0.84 kg), while weight did not change with oat cookies of similar fiber and calories. A 12-week trial of an unripe Asian pear extract tablet found no difference from placebo in body fat, weight or BMI.
Blood pressure readings with daily fresh pears
In the same 12-week pear trial, systolic blood pressure only tended to fall during the pear period (134 to 130 mmHg, not significant) and pulse pressure fell within that period. The abstract reports no blood pressure difference versus the control drink. A review of apple and pear trials did not pool blood pressure data, and its two apple trials disagreed.
Next-day hangover symptoms with Korean pear juice before drinking
In a single-blind crossover trial in 14 healthy young men, Korean pear juice taken 30 minutes before a large amount of spirits gave 16% lower total hangover severity at 15 hours than placebo, with less trouble concentrating and lower blood alcohol. It was one small study, and the abstract does not state its funder.
A source of fiber, with more fructose than glucose and some sorbitol
By USDA data, a medium pear supplies about 5.5 g of fiber and 100 g has 6.4 g of fructose against 2.6 g of glucose. A review cites about 2.5% sorbitol. In children, pear juice was poorly absorbed more often than apple or grape juice; these sugars reaching the colon may explain the laxative reputation of pears, which has not been tested in a controlled trial.
Mechanism of action
Unpaired fructose and sorbitol reach the colon
Pears contain fructose in excess of glucose plus sorbitol, both FODMAPs that the small intestine can absorb poorly. Unabsorbed sugars are fermented in the colon, which shows up as breath hydrogen and can draw water into the bowel. In young children, pear juice raised breath hydrogen more often than grape juice.
Fructose-rich fruit before a meal blunts the glucose peak
In meal tests, pear carbohydrate is mostly fructose (8.6 g of fructose and 5.5 g of glucose in a 15 g portion), which raises blood glucose less than starch. Eating the fruit 30 minutes before rice lowered the peak rise, and across fruits the glycemic index fell as fructose content rose.
Alcohol-metabolizing enzymes (lab and mouse data)
In lab tests, Korean pear raised the activity of alcohol dehydrogenase and aldehyde dehydrogenase, and in mice it lowered blood alcohol after ethanol. In mice lacking the ALDH2 enzyme it raised blood acetaldehyde. These are lab and animal findings.
Clinical trials
Randomized, open-label crossover trial of two medium fresh pears a day or a calorie-matched control drink (a pear-flavored powder in the registry), 12 weeks each with a 4-week washout; primary outcome blood pressure. Registered NCT02228837 with Pear Bureau Northwest and the Washington Tree Fruit Research Commission among the collaborators; a later review lists the Fresh Pear Committee and Pear Bureau Northwest as funders. (Navaei et al. 2019, Food Funct)
40 men and women aged 45 to 65 with metabolic syndrome in Florida.
No between-group blood pressure result is reported in the abstract: systolic blood pressure only tended to fall within the pear period (134 to 130 mmHg, P = 0.07), and pulse pressure fell within it (54 to 51). Leptin and waist-to-hip ratio were lower than control at 12 weeks, and waist circumference at 6 weeks (108.1 vs 108.8 cm). The changes were small.
Randomized crossover glycemic test: Hosui Asian pear, apple or orange (15 g carbohydrate) eaten 30 minutes before a rice meal, either replacing some rice or added on top, compared with water before rice; funded by China Agricultural University. (Lu et al. 2021, Nutrients)
14 healthy female university students in Beijing, average age 22.
All fruit preloads lowered the incremental peak glucose and glucose swings compared with water before rice (P < 0.001). With extra fruit carbohydrate added, total glucose area was not lower than control, but area per gram of carbohydrate was. Apple gave the lowest response; pear was between apple and orange. Satiety did not differ.
Randomized trial at a primary care unit in Rio de Janeiro adding three apples, three pears or three oat cookies (about 6 g fiber and 200 kcal) to the usual diet. (de Oliveira et al. 2008, Appetite)
49 women aged 30 to 50 with BMI over 25.
Energy density and energy intake fell in the fruit groups (pear about 20 kcal a day less) while the oat group's rose slightly. Weight fell by 0.84 kg with pears and 0.93 kg with apples, while weight did not change with oat cookies (+0.21 kg). Small trial; the weight changes were under 1 kg.
Randomized, double-blind, placebo-controlled trial of UPhenon, an unripe Pyrus pyrifolia extract tablet (800 mg once daily), versus a corn starch tablet; government-funded, with three authors employed by the extract developer, Suheung. (Roh et al. 2026, Int J Stem Cells)
84 Korean adults with obesity analyzed (100 enrolled).
Body fat mass, body weight and BMI fell within the extract group but did not differ from placebo (body fat P = 0.19). AST, a liver enzyme, fell more than with placebo. No adverse effects were seen. This tested a concentrated extract, not the fresh fruit.
Randomized, single-blind crossover trial of Korean pear (Pyrus pyrifolia cv. Shingo) juice or placebo 30 minutes before 540 ml of spirits (20.1% alcohol), with blood and urine sampled over 15 hours; the abstract does not state the funder. (Lee et al. 2013, Food Chem Toxicol)
14 healthy young men in Korea.
Total and average hangover severity at 15 hours were 16% and 21% lower with pear juice (P < 0.05); trouble concentrating improved, and blood alcohol was lower (P < 0.01). Memory and light and sound sensitivity improved only in men with certain ALDH2 gene types. Very small, single-blind study.
Randomized single-serving study with breath hydrogen measured for 3 hours and parent-reported symptoms for 24 hours. (Nobigrot et al. 1997, J Am Coll Nutr)
104 healthy children aged about 1, 3 and 5 years in Brooklyn, New York.
Incomplete absorption followed 84% of pear juice servings versus 41% for apple and 20 to 24% for grape juice (P < 0.05), mainly at ages 1 and 3; at 5 years juices did not differ. Parents reported diarrhea in six children after pear juice, two after apple juice and two after purple grape juice.
Breath hydrogen tests after single servings, then random assignment to pear or white grape juice at 10 mL/kg twice daily for 2 weeks. (Lifschitz 2000, Pediatrics)
12 healthy infants aged 5 to 9 months.
At this smaller amount both juices were well absorbed: peak breath hydrogen did not differ, and stool water did not change after 2 weeks with either juice. No stomach symptoms were reported. This contrasts with larger servings in earlier studies.