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 Table of Contents  
ORIGINAL ARTICLE
Year : 2019  |  Volume : 10  |  Issue : 1  |  Page : 3

Effect of natural honey on glycemic control and anthropometric measures of patients with type 2 diabetes: A randomized controlled crossover trial


Nutrition Research Center, School of Nutrition and Food Sciences, Shiraz University of Medical Sciences, Shiraz, Iran

Date of Submission28-Feb-2018
Date of Acceptance31-Jul-2018
Date of Web Publication15-Jan-2019

Correspondence Address:
Masoumeh Akhlaghi
Nutrition Research Center, School of Nutrition and Food Sciences, Razi Blvd, Shiraz
Iran
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/ijpvm.IJPVM_109_18

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  Abstract 


Background: Due to high content of fructose, honey has been introduced as a suitable natural sweetener for patients with type 2 diabetes. We investigated the effect of honey consumption on glycemic control and anthropometric measures of patients with type 2 diabetes. Methods: This randomized controlled crossover clinical trial was conducted on 53 patients with type 2 diabetes. The participants were randomly divided into groups of control (weight maintenance diet) or treatment (weight maintenance diet +50 g/day honey) for 8 weeks. After a 4-week washout, the second phase began, in which the role of the groups was interchanged. Blood glycated hemoglobin (HbA1c), glucose, insulin, and anthropometric characteristics were measured. Statistical analysis was performed with SPSS. Repeated measures of ANOVA were used to test differences within- and between the two conditions. Results: Forty-two patients completed the study. HbA1c significantly decreased in control (−0.22%, P = 0.03) and nonsignificantly increased in honey condition (+0.17%, P = 0.22). There was a significant difference between the two conditions (P = 0.02). Fasting glucose did not significantly change in either honey or control condition but insulin concentrations (−0.85 μU/ml, P = 0.01) and insulin secretion (−10.7%, P = 0.01) decreased significantly in the control condition. There was no significant difference in any of these parameters between the two conditions. Waist circumference decreased by honey treatment with a significant difference between the two conditions (P = 0.02). Conclusions: Eight weeks consumption of 50 g/day honey increased HbA1c and decreased waist circumference of patients with type 2 diabetes.

Keywords: Diabetes mellitus, honey, insulin resistance, type 2, waist circumference


How to cite this article:
Sadeghi F, Salehi S, Kohanmoo A, Akhlaghi M. Effect of natural honey on glycemic control and anthropometric measures of patients with type 2 diabetes: A randomized controlled crossover trial. Int J Prev Med 2019;10:3

How to cite this URL:
Sadeghi F, Salehi S, Kohanmoo A, Akhlaghi M. Effect of natural honey on glycemic control and anthropometric measures of patients with type 2 diabetes: A randomized controlled crossover trial. Int J Prev Med [serial online] 2019 [cited 2019 Feb 15];10:3. Available from: http://www.ijpvmjournal.net/text.asp?2019/10/1/3/250285




  Introduction Top


Limiting simple carbohydrates, especially in the form of sugar-sweetened drinks and foods, is a general recommendation for patients with type 2 diabetes.[1] Nonetheless, abstaining from sweets, beverages, and other sugar-containing foodstuff is not easy and diabetes patients always seek for substitutes that are less harmful than sugar.

Honey is a natural sweetener which has been used from ancient times before production of sugar. The sweetness of honey is due to its high fructose and glucose content as well as small amounts of sucrose.[2] Because of its high fructose content, honey has a low glycemic index[3] although the glycemic index of honey may also be irrespective to its fructose content.[4]

Although animal studies have shown beneficial effect of honey on glycemic control,[5],[6] results of human studies are still controversial: some of these studies have used a single dose of honey;[5] the results of these studies cannot accurately demonstrate the suitability of honey for long-term usages. In two investigations, relatively long-term (2–4 weeks) effect of honey was evaluated.[7],[8] However, comparison of honey with simple carbohydrates, such as sucrose and glucose, as performed in these studies, makes drawing conclusion on the suitability of honey for patients with type 2 diabetes difficult because simple carbohydrates have high glycemic index and are not appropriate for doing comparison when participants are patients with type 2 diabetes. In the most relevant work, long-term effect of honey on diabetes patients was compared with no treatment in the control group;[9] however, administration of high and incremental doses of honey (starting from 1 g/kg/day for the first 2 weeks to 2.5 g/kg/day for the last 2 weeks) that was used is unusual and does not imitate real consumptions.

Therefore, the current study was the first that evaluated long-term (8 weeks) effect of moderate quantities of natural honey (50 g) on glycemic control, insulin concentration, and anthropometric measures of patients with type 2 diabetes. Furthermore, what privileges this investigation compared to previous works is the measurement of anthropometric indices, particularly waist and hip circumference in order to determine how this energy-containing intervention affects these characteristics.


  Methods Top


Study design

The study was a randomized crossover trial consisting of two 8-week interventions with a 1-month washout in between. A sample size of 26 in each group was determined according to a previous publication[9] to detect a mean between-group difference of 25 mg/dl for fasting blood glucose change and a standard deviation of 4, power of 80%, error of 5%, and a dropout rate of 20% for a crossover design.

Participants

Participants were 53 patients with type 2 diabetes, as diagnosed by an endocrinologist, selected from enrollees of health-care services of Nader Kazemi Diabetes Clinic in Shiraz, Iran. The fasting blood glucose of <200 mg/dl was required as an inclusion criteria. Patients with gastrointestinal disorders including fructose intolerance, malignancy, organ failure, pregnancy or lactation, and applicants of chemotherapy or immunosuppressive medications were not included. Hospitalization, insulin therapy, change of oral hypoglycemic medications, and loss of willingness to continue led to exclusion from the study. Written informed consent was obtained from all participants. The trial was approved by the Ethics Committee of Shiraz University of Medical Sciences (Approval no. CT-9374-7434) and registered with the Iranian Registry of Clinical Trials (IRCT 2015052222364N1 registered on July 26, 2015).

Intervention

The study was conducted from April through August 2015. A run-in period of 2 weeks was used, during which patients followed a weight maintenance diet that was continued until the end of the study. The weight maintenance diet was prescribed individually for each patient according to his/her energy requirements and based on World Health Organization guidelines for healthy diet.[10] An exchange list was also provided to ensure that the participants freely choose their diet over a various food options.

The study included two 8-week sequences separated with 1 month washout. In the first sequence, the participants were allocated to either honey (50 g/day + weight maintenance diet) or control group (weight maintenance diet), and in the second sequence, the role of the groups was exchanged. Allocation was performed by block randomization. Two investigators enrolled the participants and a third investigator generated the random allocation sequence and assigned the participants to the arms. With a block size of 4, six possible sequences of arms (A or B) were determined and numbered from 1 to 6. Using computer-generated random numbers, the sequences were ordered. The allocation of the participants to the intervention groups was performed according to this order.

Natural unprocessed honey from milk vetch (Astragalus bisculatus) flowers was used. Major carbohydrate composition of the honey was as follows: 39.6% fructose, 33.3% glucose, and 3.0% sucrose as assessed by our biochemical laboratory according to the method previously described.[11] Special measuring cups were provided for the participants to ensure consuming accurate amount of honey. The patients were asked to divide 50 g honey into three portions and to consume them between meals with beverages, such as water, tea, coffee, milk, or with snacks like yogurt, fruit, and vegetables. Because the participants were patients with type 2 diabetes, we could not designate a suitable and ethically approved placebo for honey; so the control group was only recommended to continue their weight maintenance diet and to exclude honey from their diet.

Participants were asked to continue their usual physical activity and lifestyle and to refrain from special diets during the study. The administered amount of honey was within the range of recommendations for added sugar[12],[13] and according to dietary guidelines of the American Dietetic Association for adults with type 1 and type 2 diabetes.[14] Patients were advised to abstain from all sources of sugar-sweetened foods and beverages other than the honey that was prescribed in the treatment condition.

Assessments

Blood was collected at baseline and the end of each sequence of the study after a 12-h overnight fast. Serum was obtained through centrifugation of blood at 3000 rpm for 15 min and serum samples were frozen and kept at 70°C until the end of the study. Glucose (Pars Azmoon, Tehran, Iran), HbA1c (Pishtaz Teb Diagnostics, Tehran, Iran), and insulin (Monobind Inc., Lake Forest, CA, USA) were measured using commercially available kits. Homeostatic model of assessment – insulin resistance (HOMA-IR), as an index of insulin resistance, was calculated by the following equation: HOMA-IR = [fasting glucose (mg/dl) × fasting insulin (μU/ml)]/405.[15] HOMA-β, as the indicator of β-cell function, was calculated as follows: HOMA-β = [360 × fasting insulin (μU/ml)]/[fasting glucose (mg/dl) − 63]%.[15] Quantitative insulin sensitivity check index (QUICKI) as an insulin sensitivity marker was calculated as QUICKI = 1/(log fasting insulin + log fasting glucose).[16]

Well-trained dietitians performed anthropometric measurements and dietary and physical activity assessments at baseline, after 4 weeks and the end of each sequence. Anthropometric characteristics were assessed by a single investigator in order to reduce erroneous measurements, as described previously.[17] Diet was evaluated by 3-day 24-h diet recall. Nutrient composition of the consumed foods was determined by Nutritionist IV version 3.5.2 (Hearst Corp., San Bruno, CA) using the US Department of Agriculture Food Composition Databases with additions for Iranian foods. A valid international physical activity questionnaire was used to assess physical activity. Physical activity was expressed as metabolic equivalent task (met min/week).[18]

Statistical analysis

Statistical analyses were performed with SPSS version 19 (SPSS Inc., Chicago, IL, USA). The normality of data distribution was examined by Kolmogorov–Smirnov test and data were log transformed where data were not normally distributed. Pairwise data were tested by paired samples t test. Repeated measures ANOVA was used to test differences within (time effect in each condition) and between (time × treatment interaction) the two conditions. The sufficiency of the washout period was evaluated by determining the carryover effect of a 2 × 2 crossover study by using ANOVA test, which was determined by STATA software version 12.0 (StataCorp LP, Texas, USA). P < 0.05 was considered as the significance level.


  Results Top


Among the 53 participants, 42 (22 men and 20 women) completed the study. Eleven patients were excluded for reasons such as hospitalization and unwillingness to continue the study [Figure 1]. The participants were with the mean age of 57.5 ± 10.2 years, almost half men (52.4%), and mostly married (92.9%). According to inclusion criteria, participants were not on insulin treatment but were on control of hypoglycemic agents (92.9% metformin, 40.5% glibenclamide, 26.2% acarbose, 9.5% gliclazide, 7.1% glitazone, and 2.4% repaglinide).
Figure 1: Flow diagram of the trial

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Biochemical, anthropometric, and dietary intakes of participants did not differ between the two groups at baseline (data not shown). The effect of honey consumption on fasting glucose, HbA1c, and insulin indices are demonstrated in [Table 1]. Fasting blood glucose was increased in both conditions but no significant difference was observed within or between conditions. HbA1c decreased significantly in control (P = 0.03) and increased nonsignificantly in honey condition (P = 0.22); a significant difference was observed between the two conditions (P = 0.02). In control condition, fasting insulin concentrations and the marker of insulin secretion (HOMA-β) significantly decreased (P = 0.01) and insulin resistance (HOMA-IR) (P = 0.05) and insulin sensitivity (QUICKI) (P = 0.06) showed trends toward reduction. The same alterations for insulin concentration, resistance, and secretion were observed in the honey condition but the changes were not statistically significant.
Table 1: The effect of 8 weeks honey consumption on fasting glucose and insulin resistance (values are the sum of both sequences)a

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Weight and BMI significantly decreased in honey condition (P = 0.001) while hip circumference significantly decreased in both control and honey conditions (P = 0.004); however, no significant difference was observed between the two conditions [Table 2]. Waist circumference, waist-to-hip ratio, and waist-to-height ratio increased in the control and decreased in the honey condition; however, the difference between the two conditions was significant only for waist circumference and waist-to-height ratio (P = 0.02). No carryover effect was detected for any of the measured parameters.
Table 2: Anthropometric measurements during the study period (values are related to both sequences)a

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Evaluation of dietary intakes of study participants demonstrated that the mean intakes of energy, carbohydrate, protein, fat, and fiber did not differ between the two conditions, although the intake of fructose and glucose was significantly higher in the honey condition [Table 3].
Table 3: Mean energy and macronutrient intake and physical activity of the participants during the study perioda

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  Discussion Top


The present work indicated that consumption of 50 g/day honey worsened glycemic control as evidenced by significant difference in changes of HbA1c between honey and control conditions. No significant change in fasting blood glucose, insulin, or markers of insulin resistance, secretion, and sensitivity was observed between the two conditions. In agreement with these results, human studies on the long-term effect of honey on glycemic control of diabetes patients are very scare; only two investigations have examined honey on glycemic control of diabetes patients[9] or glucose-intolerant individuals.[7] In agreement with us, in the most similar study, Bahrami et al. reported deterioration of glycemic control following ingestion of high and incremental doses of honey (increasing from 1 g/kg/day to 2.5 g/kg/day).[9] However, in the other investigation by Raatz et al., honey consumption for 2 weeks had no effect on serum glucose in comparison with sucrose or high-fructose corn syrup.[7] The discrepancy in the results of Raatz et al. with ours and Bahrami et al. studies could be due to the control condition: while Raatz et al. compared honey with sucrose and high-fructose corn syrup, we and Bahrami et al. compared honey with no-honey condition.

Honey contains approximately 80% carbohydrates, with fructose and glucose being the most abundant.[2],[19] The ratio of fructose to glucose in honey varies from 0.46 to 1.62, depending on the floral source and climate circumstances.[20] Fructose is a monosaccharide which slowly absorbs in the small intestine, rendering it to cause lower glycemic response compared to other carbohydrates.[21] On the other hand, after absorption, liver picks up about 50–70% of the fructose independently of insulin.[20] Due to these characteristics of fructose, honey may be assumed as a suitable sweetener for patients with type 2 diabetes. However, honey also contains high amounts of glucose which has a high glycemic index. Moreover, glucose itself expedites fructose absorption in the small intestine, and this effect becomes more prominent where equal amount of fructose and glucose is consumed.[21] Hence, the glucose content of honey is an important factor in determining usefulness of honey for diabetes patients.[22] The ratio of fructose to glucose in the honey used in this study was 1.18. Given that only a small quantity of fructose exceeded the amount of glucose, the detrimental effect of honey on HbA1c seems reasonable.

The participants showed a significant weight reduction in honey condition and a significant difference in waist circumference changes between the two conditions. In agreement with this finding, Bahrami et al. found worsened glycemic control along with weight reduction following honey consumption.[9] The reduction of weight may be causally related to deteriorated glycemic control as a result of glycosuria.[23] However, as the weight reduction was also reported in the case of blood glucose improvement in overweight/obese individuals who consumed honey,[24] it is possible that the effect of honey on weight is unrelated to glycemic control. Honey is a mixture of minerals, vitamins, antioxidants, phenolic compounds, and oligosaccharides.[25] It is not unlikely if any of these or other unknown ingredients in honey exerts beneficial effect of honey on weight. For instance, small amounts of oligosaccharides in honey can delay gastric emptying, slow digestion rate, and prolong satiety.[26] Also, a part of anti-obesity effect of honey may be exerted through reduced food intake by modulation of appetite-regulating hormones, such as ghrelin and peptide YY3–36.[27] Moreover, phenolic compounds of honey may prevent weight gain by reduced calorie intake and increased fat oxidation.[28] More studies around possible mechanisms are needed before a clear conclusion on of the effect of honey on weight can be reached.

Both BMI and waist circumference are associated with increased risk of type 2 diabetes[29] and cardiovascular diseases.[30] In addition, results of a systematic review suggest that waist-to-height ratio is a more useful global tool for prediction of diabetes and cardiovascular disease risk than waist circumference.[31],[32] Our previous work, also, showed that waist-to-height ratio and to a less extent waist circumference is associated with the age-related increase in cardiovascular disease risk factors.[28] Therefore, reduction of waist circumference and waist-to-height ratio may have beneficial consequences on overall health of diabetes patients. Although the size of changes that were observed in weight and waist circumference was small, such small effect size was observed during an 8-week intervention. Longer applications may cause more remarkable changes particularly when we note the increased waist circumference in the control condition. Nonetheless, the augmentation of HbA1c following honey consumption is a disadvantage that may surmount the beneficial effect of honey on waist circumference. Hence, educational strategies still need to advise diabetes patients to limit their honey consumption.[33]

Our study had strengths and limitations. We used a crossover design in order to decrease the effect of subject judgment upon the type of treatment. The use of natural honey and measuring anthropometric variables by a single investigator were also among strengths of this study. But we could not follow-up the participants for more than 8 weeks to see what the long-term effects of honey are on weight and waist circumference.


  Conclusions Top


Overall, results of this study showed that 8 weeks consumption of 50 g/day honey from milk vetch flowers increased HbA1c of patients with type 2 diabetes. Honey treatment also decreased waist circumference and waist-to-height ratio compared to the control. Although diminution of waist circumference may have favorable metabolic consequences, the increment of HbA1c may result in exacerbation of diabetes complications, suggesting that honey need to be consumed with caution by patients with type 2 diabetes. Future research need to examine long-term metabolic consequences of the reduced waist circumference on glycemic control and insulin resistance.

Financial support and sponsorship

The results presented herein were extracted from the thesis written by Ms. Fatemeh Sadeghi (grant no. 93-7434).

Conflicts of interest

There are no conflicts of interest.



 
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