September 4, 2025, 10:56 am | Read time: 5 minutes
The active ingredient in turmeric root, curcumin, is credited with anti-inflammatory, antioxidant, and digestive properties. Taking turmeric supplements is said to alleviate digestive issues, support liver function, and strengthen the immune system. Additionally, scientific interest in turmeric’s potential to combat obesity has been growing for some time. In this context, a new study has yielded potentially relevant results regarding weight management in diabetes.
Turmeric for Weight Management in Diabetes
Overweight is a significant risk factor for the development of type 2 diabetes. It promotes the development of insulin resistance, a precursor to the disease. This resistance makes body cells less sensitive to insulin, hindering glucose absorption from the blood. Weight loss is one of the most crucial components for successful treatment of existing diabetes. Among other benefits, it improves blood sugar levels in affected individuals. For several years, research has been exploring whether turmeric or its component curcumin has properties that can counteract overweight. This is highlighted in a recent study.1 The research team systematically investigated for the first time whether taking turmeric supplements can aid weight management in people with prediabetes or type 2 diabetes–with promising results.
Study Details
The study was based on existing, relevant studies on the topic from 1990 to June 2024. These had to meet strict criteria to be considered. Studies without a control group, animal studies, and those testing turmeric in combination with other treatments were excluded. Instead, they had to compare treatment with turmeric or curcumin against a placebo. The researchers examined, among other things, the form in which turmeric supplements were used, such as classic curcumin capsules or special, highly effective variants like nano- or micelle curcumin. They also documented dosage, duration of intake, and the type of placebo. If important information was missing, the team attempted to contact the responsible study authors directly.
Participants had to be over 18 years old and have type 2 diabetes or at least prediabetes. If there were multiple reports on identical participant groups, the researchers used only the most recent and comprehensive data. At least one of the following body characteristics had to be present:
- the Body Mass Index (BMI),
- body weight,
- body fat percentage,
- waist circumference (WC),
- hip circumference (HC), or
- waist-to-hip ratio (WHR) of the participants.
Methodology
For statistical analysis, the researchers used a so-called random-effects model. This allows for the analysis of different types of studies. They calculated the average difference between the groups, specifically how the values of participants with diabetes or prediabetes changed under the intake of turmeric. They determined the weighted mean difference (WMD) between the groups, which is the average difference between turmeric/curcumin and placebo.
Another aspect of the study was identifying factors that might have influenced the effect, such as longer intake duration or higher dosage. Finally, the team assessed the reliability of the results using the internationally recognized GRADE system.
Prediabetics Benefit Most from Turmeric Intake
The researchers observed an average weight loss of about 1.9 kilograms in patients with type 2 diabetes during the study. Their waist circumference also decreased by about 1.9 centimeters, and body fat percentage by around 2.9 percent. Hip circumference was reduced by an average of one centimeter.
An even clearer picture emerged for participants with prediabetes. They lost an average of about 2.5 kilograms through turmeric intake. Their waist circumference decreased by 2.9 centimeters. However, no significant changes were observed in BMI and waist-to-hip ratio in either group.
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Diabetics May Need More and Longer Supplementation
According to the data, the effects were more pronounced in participants with diabetes when turmeric intake lasted longer than 22 weeks. In these cases, the average weight loss was about 2.5 kilograms. Regarding waist circumference, higher dosages proved particularly effective. It is recommended to take about 1,500 milligrams of curcumin daily. Supplements with piperine, a substance that significantly enhances curcumin absorption, showed a particularly large effect.
However, piperine can also promote side effects. Three of the 20 analyzed studies reported this. These were not severe–ranging from itching, dizziness, and stomach pain to constipation and nausea, and even hot flashes. The researchers caution that patients who regularly take medication should consult their doctor before taking turmeric.
Researchers Recommend Turmeric Intake for Diabetes
In summary, the researchers report a moderate but clinically relevant effect. The observed changes could have a positive impact on the health of people with diabetes. After all, even a smaller waist circumference can reduce the risk of cardiovascular and other metabolic diseases.
The results thus suggest that regular intake of turmeric supplements is indeed recommended for people with diabetes–at least as a supplement to therapy. However, they are not a substitute for a healthy diet and regular exercise. Depending on the severity of the condition, medical supervision of the treatment is important.
Interpretation of Study Results
Various limitations must be considered when evaluating the results. On one hand, the studies differ significantly in terms of the turmeric dose and formulation, treatment duration, and composition of participant groups. This affects the reliability of the results. However, there is no heterogeneity regarding the origin of the studies. Many were conducted in Iran, so it is unclear how well the findings can be generalized to other populations. The fact that BMI did not change significantly in most analyses despite reductions in weight and waist circumference suggests that the study durations were too short for verifiable effects.