Benefits
Late-pregnancy date eating in a randomized birth study
In a randomized trial of 154 first-time mothers in Malaysia, eating dates daily from about week 36 (7 dates, about 80 g) was followed by less use of oxytocin to strengthen labor than routine care. Dates did not bring on labor sooner, and there was no significant difference in induction, delivery mode, bleeding or newborn Apgar scores. There was no placebo food.
Late-pregnancy date eating in two birth studies without true randomization
In an Iranian trial of 182 first-time mothers, assigned by clinic weekday rather than true randomization, 70 to 75 g of dates a day from week 37 was followed by greater cervical dilation on admission, more labors that started on their own and less oxytocin use. A non-randomized Jordanian study of 114 women reported similar differences. Reviews rated most such studies at high risk of bias.
Postpartum blood loss chart scores in a randomized date trial
In a non-blinded randomized trial of 98 women in Iran, 100 g of dates eaten 2 hours after a vaginal birth was followed by lower blood loss scores over the next 24 hours than in a control group that ate no dates (median 35 vs 39 on a pictorial chart). Blood loss was self-recorded on the chart, and this was a single trial.
Breast milk volume in a postpartum trial
In a randomized trial of 48 breastfeeding mothers in Thailand with infants aged 1 to 3 months, eating 10 dates a day on top of the usual diet for 4 weeks raised pumped breast milk volume (by 23% from baseline at week 4) more than the usual diet alone. Infant weight-for-age did not differ, and there was no placebo food.
Stool frequency with seven dates a day
In a randomized crossover study of 22 healthy UK adults, 7 Ajwa dates (about 50 g) a day for 3 weeks raised stool frequency, with no diarrhea, while stool form, bloating and pain did not change. The paper's table tests the rise against baseline rather than against the sugar control, and gut bacteria counts and short-chain fatty acids did not differ from control.
Post-meal blood sugar response and 12-week HbA1c with daily dates
Glycemic index tests placed dried dates in the low to medium range (about 44 to 55 for five varieties, and about 53 to 71 across ripening stages in another study), though a 50 g carbohydrate portion is a large serving. In a 12-week randomized trial in adults with type 2 diabetes, 60 g a day of dates did not change HbA1c, fasting glucose or blood lipids compared with raisins.
Mechanism of action
Sugar, fiber and mineral content
USDA lists, per 100 g of Medjool dates, 277 kcal, 66.5 g of sugars (about equal glucose and fructose), 6.7 g of fiber and 696 mg of potassium; Deglet Noor dates have 63.4 g of sugars, including 23.8 g of sucrose, and 8.0 g of fiber. A pitted Medjool date weighs about 24 g and a Deglet Noor date about 7 g.
Proposed explanations for the labor findings
Trial authors suggest that the sugars supply energy for labor, that fatty acids in dates may feed prostaglandin production, and that dates may make the uterus respond better to oxytocin. These ideas rest on earlier lab and animal work cited by the authors; none of the human trials measured them.
Polyphenols and fecal water in the crossover study
The 50 g of Ajwa dates supplied about 3.9 g of fiber and 750 mg of polyphenols. Fecal water collected after the date period caused less DNA damage to cells in a lab assay (the Comet assay) than after the control period. Gut bacteria counts and short-chain fatty acids did not change. This is a lab marker, not a health outcome.
Clinical trials
Randomized controlled trial in Malaysia of daily date fruit in late pregnancy versus routine care, with no placebo food; details of the date amount come from a later systematic review. (Razali et al. 2017, J Obstet Gynaecol)
154 first-time mothers with an uncomplicated singleton pregnancy (77 per group); the date group ate 7 dates (about 80 g) a day from 36 weeks until active labor.
The date group needed oxytocin to augment labor less often than the control group but had a longer interval from the start of the intervention to delivery. Spontaneous onset of labor did not differ. A later review lists no significant differences in cervical dilation on admission, labor stage lengths, induction, delivery mode, bleeding, hemoglobin, Apgar scores, neonatal unit admission or birth weight.
Trial at OmAlBanin Hospital, Mashhad, Iran (registered with the Iranian Registry of Clinical Trials), described as randomized, but groups were assigned by clinic day of the week; no placebo food, and women in the date group who ate dates for less than 2 weeks were excluded. (Kordi et al. 2017, Iran J Nurs Midwifery Res)
182 first-time mothers aged 18 to 35 (91 per group); 70 to 75 g of Mazafati dates (6 or 7) a day from week 37 versus no dates.
Cervical dilation on admission was greater with dates (4.05 vs 2.54 cm, P < 0.0001), labor started on its own more often (94.5% vs 41.3%) and oxytocin was used less often (5.5% vs 48.7%). The active phase and the second and third stages were shorter overall. Among women whose labor started on its own, the active phase did not differ (P = 0.24), while the second and third stages were shorter.
Two-group, non-blinded randomized trial at Al-Zahra Hospital, Rasht, Iran (registered IRCT20210607051505N2), with allocation hidden in sequentially numbered sealed envelopes. (Niknami et al. 2023, BMC Womens Health)
98 women randomized after a vaginal birth; 93 analyzed (48 dates, 45 control). The date group ate 100 g of Mazafati dates 2 hours after delivery; the control group ate no dates.
Median blood loss on the Pictorial Blood Loss Assessment Chart over the first 24 hours was 35.0 with dates and 39.0 in the control group, a median difference of 9.0 units (95% CI 2.0 to 18.0, P = 0.009). The authors list the self-reported chart as a limitation, and there was no placebo food.
Parallel randomized controlled trial in Bangkok, Thailand, comparing the usual diet plus date fruit with the usual diet alone; no placebo food. (Modepeng et al. 2021, Breastfeed Med)
48 breastfeeding women and their infants aged 1 to 3 months (25 dates, 23 control); 10 dates a day for 4 weeks.
Milk volume, measured with an electric breast pump over 2 days, rose 11% from baseline by week 2 and 23% by week 4 in the date group, and was significantly higher than in the control group (p < 0.05). Infant weight-for-age did not differ between groups.
Randomized, controlled, single-masked crossover trial at the University of Reading, UK (registered NCT02288611), comparing Ajwa dates with an energy-matched maltodextrin and dextrose control, 21 days each with a 14-day washout. (Eid et al. 2015, Br J Nutr)
22 healthy adults aged 18 to 55 (21 completed); 7 dates (about 50 g) a day or 37.1 g of the sugar control.
Stool frequency was 1.40 a day after the date period and 1.21 after the control period; the table marks the rise as significant against baseline. Stool form, abdominal pain, bloating and flatulence did not differ. Bacterial counts and short-chain fatty acids did not change versus control. Fecal water after dates caused less DNA damage in a lab assay than after control (P < 0.01).
Prospective, randomized, parallel trial at King Hamad University Hospital, Bahrain, with computer-generated block randomization, comparing dates with raisins matched for glycemic index; the authors declare no conflicts. (Butler et al. 2022, Nutrients)
79 adults aged 30 to 76 with type 2 diabetes (39 dates, 40 raisins); 61 completed. 60 g a day of Khalas dates or of raisins, split between midmorning and midafternoon, for 12 weeks.
HbA1c, fasting glucose and their variability, HOMA insulin resistance, blood lipids, blood pressure and CRP did not differ between or within groups (p > 0.05); final HbA1c was 7.5% with dates and 7.6% with raisins. Weight did not change. Six people withdrew from the date group and 12 from the raisin group.
Glycemic index study at United Arab Emirates University (registered NCT01307904): each volunteer took 50 g of glucose on 3 days and portions of 5 date varieties at the Tamer stage, each supplying 50 g of available carbohydrate, on separate days. (Alkaabi et al. 2011, Nutr J)
13 healthy adults (mean age 40) and 10 adults with type 2 diabetes managed with lifestyle measures or metformin (mean HbA1c 6.6%).
Mean glycemic indices were 46.3 to 55.1 in the healthy volunteers and 43.8 to 53.0 in those with diabetes, with no significant differences between varieties or between the two groups. These were single test portions, not daily intake.