Context: A recent study published in The Lancet Diabetes and Endocrinology provides strong evidence linking high glycaemic index (GI) and glycaemic load (GL) diets to an increased risk of type 2 diabetes. The study, conducted across five continents, suggests that consuming low GI and GL diets may help prevent diabetes, especially among individuals with a higher BMI. The findings highlight the importance of nutritious food choices in diabetes prevention.
Glycaemic Index (GI)
- GI is a measure of how quickly a food can raise blood sugar levels. It ranks carbohydrate-containing foods on a scale from 0 to 100 based on their effect on blood glucose levels after consumption.
- Factors influencing GI: The GI of a food depends on several factors, such as the type of carbohydrate, the amount of fiber, and the processing and cooking methods used.
- A recent study published in The Lancet Diabetes and Endocrinology showed a clear link between high GI and diabetes, particularly among individuals with a higher Body Mass Index (BMI).
Glycaemic Load (GL)
- GL is a measure that takes into account both the GI of a food and the amount of carbohydrates in a serving. It is calculated by multiplying the GI of a food by the amount of carbohydrates in a serving and then dividing by 100.
- GL provides the impact of carbohydrates on blood sugar levels, which help inform dietary guidelines and public health interventions.
- It is particularly useful for diabetics as it can provide a more accurate idea of how much a food will affect blood sugar levels compared to GI.
- Comparison with GI: While GI focuses on the quality of carbohydrates, GL considers both the quality and quantity of carbohydrates consumed. GL may be a better predictor of blood sugar response than GI alone.
Type 2 Diabetes
- Type 2 diabetes is a chronic metabolic disorder characterized by high blood sugar levels, insulin resistance, and relative lack of insulin. It is often associated with obesity and a sedentary lifestyle.
- Type 2 diabetes is a major public health concern in India, with an estimated 11.4% of the country's population - living with diabetes.
- Additionally, 15.3% of the people - could be living with pre-diabetes.
- The prevalence of Type 2 diabetes in the 20s and 30s has dramatically increased in the last two decades, particularly in India.
- Uncontrolled type 2 diabetes can lead to serious complications, such as cardiovascular disease, kidney damage, nerve damage, and vision problems, highlighting the importance of early detection and proper management.
Key Findings of the Study
- High GI and GL diets are associated with a higher risk of type 2 diabetes.
- The international study, published in The Lancet Diabetes and Endocrinology, found a clear link between high GI and diabetes across five continents, involving 1,27,594 adults aged 35-70 years without known diabetes.
- Participants in the highest quintile of GL had a higher risk of incident type 2 diabetes compared to those in the lowest quintile, suggesting that both the quality and quantity of carbohydrates play a role in diabetes risk.
- GI's association with diabetes is stronger among individuals with a higher Body Mass Index (BMI).
- The study found that the association between GI and diabetes was more pronounced in individuals with a higher BMI, highlighting the importance of considering individual factors when assessing the impact of GI on diabetes risk.
- This finding suggests that people with a higher BMI may be more sensitive to the effects of high GI foods on blood sugar levels and diabetes risk.
Implications for Public Health and Policy
- Promoting low GI and GL diets could be an effective strategy for preventing type 2 diabetes.
- The study's findings support the idea that consuming low GI and GL diets might help prevent the development of type 2 diabetes, especially in high-risk individuals.
- Examples of low GI foods include fruits, grains, lentils, non-starchy vegetables, legumes, dairy, and brown rice, while high GI foods to avoid include sugar, sugary drinks, white polished rice, potatoes, and white bread.
- Targeted interventions for high-risk groups could help reduce the burden of diabetes.
- The study suggests that better and more nutritious food choices can help delay the onset of diabetes in high-risk groups, such as those with high BMI and a family history of diabetes.
- Public health policies and interventions could focus on promoting healthy eating habits and increasing access to low GI and GL foods, particularly in communities with a high prevalence of obesity and diabetes.
- Integration of GI and GL into dietary guidelines and nutrition labeling.
- The findings of the study support the inclusion of GI and GL information in dietary guidelines and nutrition labeling to help consumers make informed food choices.
- Governments and public health agencies could consider mandating the inclusion of GI and GL values on food labels, similar to the existing requirements for calories, fat, and sugar content.
Relevance to the Indian Context
- High burden of type 2 diabetes in India.
- India has the second-highest number of people with diabetes in the world.
- The Indian Council of Medical Research (ICMR) has projected that the number of people with diabetes in India will reach 134.2 million by 2045, highlighting the urgent need for effective prevention and management strategies.
- Potential impact of promoting low GI and GL diets in India.
- Given the high prevalence of diabetes and the increasing trend of obesity in India, promoting low GI and GL diets could be an important strategy for reducing the burden of type 2 diabetes in the country.
- Studies have shown that traditional Indian diets, which often include high GI foods like white rice and refined grains, may contribute to the high rates of diabetes in the population
- Encouraging the consumption of low GI foods, such as whole grains, legumes, and vegetables, could help improve blood sugar control and reduce the risk of diabetes in the Indian population.
- Challenges and opportunities for implementing GI and GL-based interventions in India.
- Implementing GI and GL-based interventions in India may face challenges, such as limited awareness about the concept among the general population and healthcare providers, and the need for culturally appropriate dietary modifications.
- However, there are opportunities for integrating GI and GL into existing public health programs, such as the National Programme for Prevention and Control of Cancer, Diabetes, Cardiovascular Diseases and Stroke (NPCDCS), and the Mid-Day Meal Scheme for school children, which has been renamed as Pradhan Mantri Poshan Shakti Nirman Yojana (PM-POSHAN).
- Collaboration between government agencies, healthcare professionals, and community organizations could help promote the adoption of low GI and GL diets and improve diabetes prevention and management efforts in India.
There is urgent need for effective strategies to prevent and manage type 2 diabetes in the country. Promoting low GI and GL diets, targeting high-risk groups, integrating GI and GL into dietary guidelines and public health programs, and fostering collaboration among stakeholders could play a crucial role in reducing the burden of diabetes in India.
As the prevalence of diabetes continues to rise, it is essential for policymakers, healthcare professionals, and the public to prioritize the adoption of healthy dietary patterns and lifestyle modifications to combat this growing public health challenge.