2. Cardiovascular and Metabolic Risk Factors
2.1. Healthy Subjects
Several authors have associated honey consumption with improvements of lipid profile in healthy subjects. In this regard, a supplementation with 70 g/day of honey for 6 weeks significantly improved the lipid profile of young men (18–30 years) compared to subjects supplemented with sucrose
[12]. Specifically, triglycerides (TG), total cholesterol (TC), and low-density lipoproteins (LDL) levels decreased, and high-density lipoprotein (HDL) levels increased between the beginning and end of the study. Those differences were also significant compared to the control group. A significant improvement in lipid profile were also demonstrated in a study conducted on young Pakistani men (20.13 ± 0.14 y)
[13]. In the experimental group supplemented with 70 g/day of natural, unprocessed honey purchased from Ilyas Traders, Charsadda, Khyber Pakhtunkhwa, (Pakistan) for 4 weeks, a significant decrease in total and LDL cholesterol levels was observed, while the HDL level increased significantly. However, changes in fasting blood glucose (FBG) and TG levels were not significant. When the two groups were compared, the increase in FBG in the experimental group was significantly lower than in the control group, the decrease in TG, TC, and LDL levels and the increase in HDL level in the experimental group were also significant compared to the control group. In addition, oral glucose tolerance (OGT) was significantly higher after honey consumption than after glucose consumption. Contrarily, Al-Tamimi et al.
[14] showed no significant effects on lipid profile or basal insulin when supplemented with 1.5 g/kg/day of a mixture of four types of clover honey obtained from Golden Heritage Foods, Smitty Bee Honey, Millers Honey Company, and Marshall’s Farm Natural Honey, for 1 month in healthy subjects aged 24–57 years. Interestingly, honey consumption did not produce the negative responses in TG levels that sucrose intake did, and thus suggests that the substitution of sucrose with natural honey may be beneficial. These results seem to indicate that supplementation for 6 weeks has a greater effect than for 4 weeks.
2.2. Overweight or Obese Subjects
Yaghoobi et al.
[15] conducted a study on overweight/obese subjects in which the experimental group consumed 70 g/day of Iranian natural honey and the control group consumed the same amount of sucrose for a month. Honey consumption resulted in a significant reduction in body mass index (BMI) and FBG. Moreover, honey significantly reduced serum TG and C-reactive protein (CRP) in subjects with elevated variables. There was also a slight reduction in body weight (BW) and body fat (BF), but these findings were not significant. In addition, the intake of honey allowed for a significant reduction in TG and CRP levels in subjects with high baseline values while it non-significantly reduced total cholesterol, LDL, TG, and CRP levels and increased HDL cholesterol in subjects with normal baseline values. In another study carried out on a group of obese prepubertal girls (10 ± 0.34 y) who had a dietary treatment, the intake of 15 g/day of wild flowers-forest-thyme honey (experimental group) or jam (control) showed similar results
[16]. The decrease in BMI was greater in the experimental group but not in a significant way. HDL levels increased in the experimental group while it decreased in the control group. TG decreased in both groups which is greater in the experimental group; however, this difference was not significant. Raatz et al.
[17] also found no significant differences in a trial conducted on overweight/obese subjects aged 35–55 years who had normal or impaired glucose tolerance. Subjects were supplemented with 50 g of Dutch Gold Honey (honey from different floral sources and geographic origin), sucrose, or corn syrup for 2 weeks. No changes in BW were observed throughout the trial, or in glucose and insulin concentrations during the glucose tolerance test. Systolic blood pressure (SBP) was unchanged while diastolic blood pressure (DBP) was significantly reduced between pre- and post-treatment in subjects supplemented with sucrose or syrup, indifferently of their glycaemic status. No significant changes in cholesterol levels were observed in either group, but TG levels increased significantly between pre- and post-treatment in sucrose-supplemented subjects. These results suggest that doses of 15 and 50 g/day are insufficient to produce significant improvements in cardiovascular risk factors. On the other hand, the intervention seems to be more effective in subjects with altered baseline values.
2.3. Diabetic Subjects
Wahab et al.
[18] carried out a study on healthy and diabetic post-menopausal women that showed that the intake of 20 g/day of Tualang sterilized honey supplied by Federal Agricultural Marketing Authorities (FAMA) (Malaysia) for 12 months had significant effects on lowering DBP and FBG. However, it had no significant effects on blood lipid profile, BMI, body composition, and waist circumference. In another study performed with type II diabetic subjects (57.2 ± 8.4 years), the experimental group was supplemented with increasing doses of Iranian natural unprocessed honey collected from Samans kandeh, Neka, Sari City, for 8 weeks, starting with 1.0 g/kg/day and increasing by 0.5 g/kg/day every 2 weeks until reaching 2.5 g/kg/day; while the control group was not supplemented with any substance. After 8 weeks of honey consumption, there were significant reductions in BW, TC, LDL, and TG, as well as a significant increase in HDL levels. There was also a decrease in FBG levels, although this was not significant. However, glycosylated hemoglobin (HbA1c) levels increased significantly in the honey-consuming group
[19].
Mamdouh et al.
[20] conducted a randomized crossover study on type I diabetic children. In the intervention period, the children were supplemented with 0.5 mL/kg/day of non-heated and non-irradiated Egyptian clover honey supplied by a beekeeper for 12 weeks. In the first period, statistically significant decreases in subscapular skinfold, FBG, post-prandial serum glucose, TC, HDL, and TG along with significant increases in fasting C-peptide and post-prandial C-peptide were observed in the intervention group compared to baseline. In the control group, no significant differences in any of the aforementioned parameters were observed. In the second period, significant reductions in midarm circumference, triceps skinfold, and fasting C-peptide were observed in the control group, while TC and LDL cholesterol increased significantly. On the contrary, significant decreases were observed in BMI, triceps skinfold, fasting serum glucose, HbA1C, total and LDL cholesterol, and TG in the intervention group. In addition, there were significant increases in fasting as well as post-prandial C-peptide and HDL.
Similarly, longer interventions with larger amounts of honey seem to have a greater effect on factors related to heart and vascular health in diabetic subjects.
2.4. Subjects with Hyperlipidemia
Al-Waili NS et al.
[21] conducted a study on a group of healthy subjects (25–48 years) and a group of patients with hypercholesterolaemia or hypertriglyceridaemia (35–55 years). Consumption of 75 g of natural honey for 15 days significantly reduced total cholesterol and CRP levels in patients with hyperlipidemia, as well as LDL levels but not significantly. However, the reduction in TC, LDL, TG, CRP, homocysteine, and FBG levels was not significant in healthy subjects. The control groups were supplemented with 75 g of artificial honey (honey–glucose mixture), which caused an increase in total and LDL cholesterol and CRP levels
[21]. These results do not agree with those obtained by Munsted K et al.
[22], who showed that consumption of the same amount of honey during the same period in subjects with hypercholesterolemia aged 35–87 years reduced TC and HDL levels, and increased LDL and TG levels. However, when differentiating between both sexes, it was observed that the LDL value increased in women in the control group supplemented with a sugar solution, but not in those supplemented with honey.
3. Glucose Tolerance
3.1. Healthy Subjects
A study on healthy men showed significantly lower increases in the concentration-time curve (AUC) profiles for glucose and a lower increase in plasma insulin after consumption of basswood (linden) honey compared to the other sugar solutions
[23]. They have also documented significantly lower increases in plasma insulin and C-peptide after consumption of natural or clover honey versus other sugar solutions in healthy subjects
[21].
3.2. Diabetic Subjects
Significantly lower increases in blood glucose levels have been observed in subjects with type II diabetes after ingestion of natural honey
[21] and clover honey
[21,24][21][24] compared to the other sugar solutions. A study carried out with healthy and type I diabetic subjects also showed a significantly lower increase in blood glucose levels following Egyptian clover honey consumption, and a significantly higher increase in C-peptide levels
[25].
These results indicate that replacing sugar with honey could be beneficial for both healthy and diabetic patients.
4. Appetite and Food Intake
4.1. Healthy Subjects
In a study conducted by Al-Tamimi et al.
[14] on healthy subjects aged 24–57 years, the intake of 1.5 g/kg/day of a mixture of four types of clover honey promoted a significantly lower intake of energy, carbohydrates, and sugars compared to the sucrose-supplemented group. The inclusion of 42.7 g of pure clover honey in a 440 kcal meal showed a significant reduction in post-prandial blood glucose while lactate increased in healthy women aged 18–40 years that consumed the honey meal versus those who received a meal including 35.5 g of sucrose
[26]. A similar pattern was observed for insulin, but the effect was not significant. The decrease in ghrelin, however, showed no significant difference between the two meals. Both post-prandial peptide YY and leptin levels did not change significantly over time and did not differ according to treatment; however, the AUC for peptide YY was significantly higher after the honey meal. Hunger and satiety were assessed, and participants received a free-choice meal 240 min after the test meal was consumed. Post-prandial satiety scores were significantly higher after the honey meal versus the sucrose one at 60 min. It could be that clover honey is satiating. In addition, the AUC for hunger during the 240 min following ingestion of the test meal tended to be lower with the honey meal than with the sucrose meal. Regarding meal-induced thermogenesis, there were no significant differences between the two groups and the same trend was found for energy and macronutrient intake in the free-choice meal between the two groups
[26].
4.2. Diabetic Subjects
Contrarily, although the trend appears to be positive in healthy subjects, Bahrami et al.
[19] reported no significant differences in diabetic patients after supplementation with Iranian natural honey for 8 weeks in energy intake or protein, fat, carbohydrate or sugar intake.
5. Alcohol Metabolism
In terms of the effect of honey on alcohol metabolism, the inclusion of freshly harvested Nigerian citrus (Citrus sinensis Osbeck) honey from the delta region of the River Niger along with alcohol intake has shown a significant decrease in the degree and time of intoxication in healthy adults
[27,28][27][28]. Therefore, honey could be a promising anti-intoxication agent. However, in men, the consumption of alcohol and honey seems to cause a significant increase in TG levels
[28]. As a result, further studies would be necessary to establish recommendations.
6. Cancer
Table 1 displays different studies conducted on cancer patients to test the effect of honey intake on various cancer-related complications, such as mucositis, weight loss, and xerostomia. In this regard, mouth washing with a solution of natural Baran-Baghro honey from Iran in water (1:20,
v/v) for 4 weeks significantly reduced the severity of mucositis in adult patients with myeloid leukemia undergoing chemotherapy and significantly increased the patients’ body weight
[29]. The same results were shown in another study carried out on patients with head and neck cancer receiving radiotherapy, who were treated with mouthwashes of a solution of pure and filtered thyme honey in water (1:5,
v/v) for 6 months. In this case, it significantly reduced the severity of mucositis and weight loss, and significantly increased overall health and quality of life in the experimental group
[30]. In agreement, Khanal et al.
[31] reported a significant reduction in mucositis in adult patients with oral carcinoma, the mouth rinse was performed with 20 mL of Western Ghats Forest honey for 6 weeks. In other studies, involving adult patients with head and neck cancer receiving chemo-radiotherapy, the treatment consisted of smearing 20 mL of honey all over the mouth and swallowing it slowly. Treatments with clover honey, thyme, and astragalus honey or tea plant honey significantly reduced the severity of mucositis
[32,33,34][32][33][34]. In addition, thyme and astragalus honey and tea plant honey significantly reduced weight loss in cancer patients
[33[33][34],
34], and clover honey significantly reduced Candida colonization, which is the most common clinical infection of the oropharynx in patients receiving radiotherapy
[32]. In another study carried out with patients with head and neck cancer aged 61 years on average who are receiving radiotherapy, chemotherapy or surgery, patients in the experimental group were given a solution of pure filtered thyme honey in water (1:5,
v/v) to swish around in their mouth and swallow slowly. There were significant reductions in the level of xerostomia, pain, and dysphagia compared to the control group as well as a significant increase in patients’ quality of life measured by a Quality of Life scales containing 15 items (Dirix XQ)
[35]. However, the same treatment with Manuka honey in the same type of patients did not produce significant changes in the severity
[36,37][36][37] or duration of mucositis
[37]. Moreover, the Manuka honey was not well tolerated by patients. Studies in pediatric patients also showed a significant reduction in the severity of mucositis using treatments with Egyptian clover honey
[38] or Turkish flower honey
[39].
A study conducted on adult cancer patients with neutropenia showed a significant improvement in neutrophil levels when supplementing these patients with 5 g/day of Life-Mel honey for 5 days
[40]. Similarly, a significant reduction in febrile neutropenia episodes with the supplementation of 2.5 g/kg twice a week of Egyptian clover honey in a study in pediatric patients was observed. In addition, the intervention group significantly improved their hemoglobin levels compared to the control group
[41].
Forest, thyme, clover, and tea tree honeys appear to be very effective in improving mucositis symptoms in cancer patients undergoing radiotherapy and/or chemotherapy; however, Manuka honey does not produce improvements and is not well tolerated by these patients; therefore, it does not appear to be recommended.
Table 1. Effects of honey on cancer patients.
Honey |
Dose |
Duration |
Subjects |
Physiological Parameter |
Effect |
Reference |
Natural Baran-Baghro honey from Iran |
1:20 honey:water Mouthwash |
4 w |
Acute myeloid leukemia patients receiving chemotherapy >18 years |
Mucositis severity |
↓ *,a |
[29] |
Body weight |
↑ *,a |
Pure and filtered thyme honey |
1:5 honey:water Mouthwash |
shows different effects of honey not discussed in the previous sections. A study carried out on healthy subjects showed that both low- and high-antioxidant buckwheat honey significantly increased plasma total phenolic concentration 2 h after consumption. However, this effect extended to 6 h only after consumption of high-antioxidant buckwheat honey. The same effect was observed on total plasma antioxidant capacity after consumption of these two honeys. Both honeys also increased total plasma reducing capacity 2 and 6 h after consumption
[56][54]. A study on subjects with blepharitis showed a significant improvement in dryness of the eye, tear film quality, and ocular surface, as well as a decrease in microbial colonization in patients treated with a Manuka honey microemulsion cream for 3 months
[57][55]. In contrast, the inclusion of 1 tablespoonful/d of natural Bristol honey or processed honey showed no improvement over placebo in the symptoms of allergic rhinoconjunctivitis
[58][56]. Wallace et al.
[59][57] found no significant change in IgE levels after consumption of 20 g of multifloral honey or manuka honey UMF 20+ for 4 weeks in healthy adults. There was also no effect on the number of intestinal bacteria of the
Bacteroides,
Bifidobacterium,
Lactobacillus,
Escherichia coli, and
Clostridium groups. Farahani et al.
[60][58] also observed no effect of Astragalus honey consumption on symptoms of dysmenorrhoea in female students with an average age of 22.
Table 3. Other health effects of honey.
Honey |
Dose |
Duration |
Subjects |
Physiological Parameter |
Effect |
Reference |
Low- and high- antioxidant buckwheat honey from the Dutch Gold company |
1.5 g/kg |
6 h |
Healthy subjects 25.55 ± 2.30 years |
Plasma phenolic concentration |
↑ * |
[56][54] |
Plasma antioxidant capacity |
↑ * |
Plasma reducing capacity |
↑ * |
Manuka honey from New Zealand |
Manuka honey microemulsion cream 0.5–1 cm Once a day |
3 m |
Patients with blepharitis 60 ± 12 years |
Dry eye symptomology |
↓ a |
[57][55] |
Tear film quality |
↑ a |
Ocular surface quality |
↑ a |
Microbial burden |
↓ a |
Local unpasteurized honey from Honeycomb Apiairies, Bristol and filtered pasteurized clover honey from Dutch Gold Honey Inc, Lancaster |
1 tablespoonful/d |
30 w |
Patients with allergic rhinoconjunctivitis 45.3 years |
Symptoms of rhinoconjunctivitis |
= |
[58][56] |
Multiflora honey and Manuka honey UMF 20+, both produced by Comvita New Zealand Ltd. |
20 g/d |
Crossover 4 w each period |
Healthy subjects 42–64 years |
IgE level |
↑ |
[59][57] |
Gut bacterial |
= |
Astragalus honey made in Ashtian Region of Iran |
1.2 g/kg from the 15th day to the onset of menstruation |
Crossover 2 m each period |
Female students with dysmenorrhea 22.01 ± 1.78 years |
Pain |
= |
[60][58] |
Amount of bleeding |
= |
Satisfaction |
= |
6 m |
Head and neck cancer patients receiving radiotherapy |
| 61.53 years |
Mucositis severity |
↓ * | ,a |
[30] |
Weight loss |
↓ a |
Global health |
↑ *,a |
Life quality |
↑ *,a |
Western Ghats forests honey |
20 mL Mouthwash |
6 w |
Oral carcinoma patients receiving radiotherapy >18 years |
Mucositis severity |
↓ a |
[31] |
Pure and filtered natural clover honey |
20 mL pure honey Rinse + swallow |
7 w |
Head and neck cancer patients receiving chemotherapy 48.20 ± 15.63 years |
Mucositis severity |
↓ a |
[32] |
Candida colonization |
↓ a |
Pure natural honey from Thymus and Astragale in the Albroz mountains in northern Iran |
20 mL pure honey Rinse + swallow |
6 w |
Head and neck cancer patients receiving radiotherapy 57.0 ± 12.0 years |
Mucositis severity |
↓ *,a |
[33] |
Weight loss |
↓ a |
Tea plant honey from Cameron Highland of peninsular Malaysia |
20 mL pure honey Rinse + swallow |
7 w |
Head and neck cancer patients receiving radiotherapy 14–89 years |
Mucositis severity |
↓ a |
[34] |
Body weight |
↑ a |
Pure and filtered thyme honey |
1:5 honey:water Rinse + swallow |
6 w |
Head and neck cancer patients receiving radiotherapy or chemotherapy or surgery 61.53 ± 13.50 years |
Xerostomia level |
↓ a |
[35] |
Quality life |
↑ a |
Pain |
↓ a |
Dysphagia |
↓ a |
Irradiated organic manuka honey |
5 mL Rinse + swallow |
6 w |
Head and neck cancer patients receiving radiotherapy |
Mucositis severity |
↓ |
[36] |
Active manuka honey |
20 mL (98% honey) Rinse + swallow |
6 w |
Head and neck cancer patients receiving radiotherapy 38–85 years |
Incidence of servere mucositis |
↑ |
[37] |
Mucositis severity |
↓ |
Mucositis duration |
↓ |
Egyptian clover honey from El Mahala, Gharbia Governorate |
0.5 g/kg/d Rinse + swallow |
10 d |
Lymphoblastic leukaemia patients receiving chemotherapy 6.9 ± 3.8 years |
Mucositis recovery time |
↓ a |
[38] |
Turkish Flower honey from the highlands of Zonguldak Province, in the Western Black Sea Region of Turkey |
3.70–30.96 g Rinse + swallow |
21 d |
Children treated in a paediatric intensive care unit (PICU) 7.25 years |
Mucositis severity |
↓ *,a |
[39] |
Life-Mel honey from Express Honey, Tzuf Globus, Israel |
5 g/d |
5 d |
Cancer patients with neutropenia 57 years |
Neutrophil level |
↑ * |
[40] |
Haemoglobin level |
↑ |
Thrombocytes level |
↑ |
Egyptian unprocessed clover honey collected from Al Mahala-Gharbia Governorate |
2.5 g/kg twice weekly |
Crossover Two 12 w periods |
Children with acute lymphoblastic leukemia 5.4 ± 2.4 years |
Febrile neutropenia episodes |
↓ a |
[41] |
Number of patients admitted in hospital |
↓ |
Duration of hospital stay |
↓ |
Haemoglobin level |
↑ a |
7. Cough and Gastroenteritis in Infants
Table 1 shows different studies in pediatric patients with common cold or URTIs. Several studies have linked the consumption of different types of honey (Buckwheat honey, Iranian, eucalyptus, citrus, Labiatae and Nairobi dark honey) with significant reductions in frequency
[42[42][43][44][45][46],
43,44,45,46], bothersome
[44[44][45][46],
45,46], and severity
[43,44,45][43][44][45] of nocturnal cough, as well as in the combined symptom score of URTIs
[42,44,45,46][42][44][45][46]. Significant improvements in sleep quality have also been observed in children and parents
[43,44,45,46][43][44][45][46]. Contrarily, a study in which children were supplemented with acacia honey for 2 days showed no significant differences with honey consumption versus placebo
[47]. On the other hand, an early study carried out on children with gastroenteritis showed a significant reduction in recovery time from bacterial gastroenteritis by substituting pure honey for glucose in the oral rehydration solution
[48].
8. Antimicrobial and Wound Healing Effects
Studies on the antimicrobial and wound healing effects of honey are described in
Table 2. Rinses with a solution of multifloral processed honey in water (1:1,
v/v) for 5 days significantly reduced dental plaque in healthy subjects, although a 0.2% chlorhexidine solution was found to be more effective
[49]. Banaeian et al.
[50] studied the influence of Iranian honey on vulvovaginal candidiasis, and they found significant reductions in inflammation, discharge, and itching after 8 days of treatment with a 70% honey cream. They concluded that although treatment with 1% clotrimazole was more effective, honey could be an alternative for the treatment of vulvovaginal candidiasis due to its wide availability and cost-effectiveness
[50]. In a study conducted on children with pyomyositis abscesses, gauze soaked in natural raw honey, or a medical solution was applied to the wounds for 21 days. Honey significantly improved wound healing and reduced the duration of hospital stay
[51]. Similarly, Lavaf et al.
[52] demonstrated that a 30% Iranian honey cream significantly increased healing and reduced discharge from episiotomy wounds in nulliparous women. Several studies have tested the effect of honey dressings on patients with diabetic foot ulcers. Muhammad Imran et al.
[53] in their study using Beri honey observed significant improvements in both wound healing and healing time in the experimental group compared to the control group treated with normal saline dressing.
Although honeys from different origins have been shown to have antimicrobial effects, they are not superior to pharmacological treatments, such as chlorhexidine, clotrimazole or povidone-iodine. However, due to their low cost, wide availability, and lack of side effects, honey could be an alternative to conventional treatments, although more research is needed.
Table 2. Effects of honey on cough and gastroenteritis in children.
Honey |
Dose |
Duration |
Subjects |
Physiological Parameter |
Effect |
References |
Buckwheat honey |
Children aged 2 to 5 (1/2 teaspoon), 6 to 11 (1 teaspoon), 12 to 18 (2 teaspoons) Single dose |
1 d |
Children with upper URTIs 5.02 ± 3.99 years |
Cough frequency |
↓ a |
[42] |
Combined symptom score |
↓ a |
Bothersome cough |
↓ |
Cough severity |
↓ |
Sleep quality |
↑ |
Parents’ sleep quality |
↑ |
Iranian natural honey from Kafi-Abad, Yazd |
2.5 mL Single dose |
1 d |
Children with URTIs 3.15 ± 0.93 years |
Cough frequency |
↓ a |
[43] |
Cough severity |
↓a |
Sleep quality |
↑ a |
Parents’ sleep quality |
↑ a |
Eucalyptus, citrus or Labiatae honey |
10 g Single dose |
1 d |
Children with URTIs 2.4 years |
Cough frequency |
↓ a |
[44] |
Combined symptom score |
↓ a |
Bothersome cough |
↓ a |
Cough severity |
↓ a |
Sleep quality |
↑ a |
Parents’ sleep quality |
↑ a |
Nairobi dark honey |
Children aged 1 to 2 (2.5 mL), 2 to 6 (5 mL), 6 to 12 (7.5 mL) Three times daily |
5 d |
Children with a common cold 1–12 years |
Cough frequency |
↓ a |
[45] |
Combined symptom score |
↓ a |
Bothersome cough |
↓ a |
Cough severity |
↓ a |
Cough duration |
↓ a |
Sleep quality |
↑ a |
Parents’ sleep quality |
↑ a |
Two kinds of Iranian honey: Kimia honey and Golha honey |
Children aged 1 to 6 (2.5 mL), 7 to 12 (5 mL), Two doses |
2 d |
Children with URTIs 3.5 ± 1.6 years |
Cough frequency |
↓ b |
[46] |
Combined standard score |
↓ a |
Bothersome cough |
↓ a |
Sleep quality |
↑ b |
Parents’ sleep quality |
↑ a |
Acacia honey |
3 mL Single dose |
2 d |
Children with URTIs 2.5 years |
Cough frequency |
↓ |
[47] |
Combined symptom score |
↓ |
Bothersome cough |
↓ |
Cough severity |
↓ |
Cough duration |
↑ |
Sleep quality |
↑ |
Pure honey |
50 mL/L of rehydration solution vs. 50 mL/L of glucose |
Duration of gastroenteritis |
Children with gastroenteritis 1.39 ± 1.82 years |
Bacterial gastroenteritis recovery time |
↓ a |
[48] |
9. Other Effects
Table 3