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These studies suggest that a diet rich in whole grains, fruits, vegetables, legumes, nuts, and moderate alcohol, while low in red/processed meats and sugar-sweetened beverages, can help prevent and manage type 2 diabetes.
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Whole grains are consistently highlighted as beneficial for reducing the risk of type 2 diabetes (T2D). Multiple studies have shown that higher consumption of whole grains is associated with a significantly lower risk of developing T2D. For instance, a meta-analysis found that an increment of 30 grams per day of whole grains was linked to a 13% reduction in T2D risk . Similarly, another study reported that individuals consuming three servings of whole grains daily had a 20-30% lower risk of T2D compared to those consuming less than three servings per week. Specific whole grain foods such as whole grain breakfast cereals, dark bread, and oatmeal have also been associated with reduced T2D risk.
Fruits, vegetables, and dairy products are also beneficial for diabetes prevention. Increased consumption of fruits and vegetables has been linked to a lower risk of T2D, with optimal consumption resulting in a 42% risk reduction. Dairy products, particularly those low in fat, have shown similar benefits. These foods are rich in essential nutrients and fiber, which help in maintaining healthy blood glucose levels.
Legumes, including lentils, chickpeas, and beans, are recommended for their low glycemic index and high nutrient density. Studies have shown that higher legume consumption is associated with a lower risk of T2D. For example, individuals with high legume intake had a 35% lower risk of developing T2D compared to those with low intake. Legumes help in glycemic control due to their slow-release carbohydrates and high fiber content.
Functional foods, which contain bioactive compounds like polyphenols and flavonoids, play a crucial role in diabetes management. The Mediterranean diet (MD), rich in fruits, vegetables, oily fish, olive oil, and nuts, serves as an excellent model for functional foods. This diet has been associated with improved insulin sensitivity, reduced inflammation, and better glycemic control. Polyphenol-rich beverages such as coffee and green tea also contribute to these benefits.
Conversely, high consumption of red and processed meats, as well as sugar-sweetened beverages (SSBs), is linked to an increased risk of T2D. Studies have shown that each additional serving of red meat per day increases T2D risk by 17%, while processed meats increase the risk by 37%. SSBs are particularly harmful, with each additional serving per day increasing T2D risk by 26% .
For individuals with diabetes, parboiled rice (PBR) is a better alternative to white rice (WR) and brown rice (BR). PBR has been shown to reduce postprandial blood glucose levels significantly more than WR and BR, making it a suitable option for managing blood sugar levels.
Adherence to specific dietary patterns such as the Mediterranean diet, Dietary Approaches to Stop Hypertension (DASH), and the Alternative Healthy Eating Index (AHEI) has been associated with a lower risk of T2D. These diets emphasize the consumption of whole grains, fruits, vegetables, nuts, and legumes while limiting red and processed meats, refined grains, and SSBs. Plant-based diets, particularly those rich in high-quality plant foods, are also effective in reducing T2D risk.
In summary, a diet rich in whole grains, fruits, vegetables, legumes, and low-fat dairy, while limiting red and processed meats and sugar-sweetened beverages, is beneficial for preventing and managing type 2 diabetes. Adopting dietary patterns such as the Mediterranean diet and incorporating functional foods can further enhance these benefits.
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