walnuts contain good fats, such as monounsaturated and polyunsaturated fats (PUFAs), but they are also a valuable vegetarian source of the essential fatty acid omega-3. They also contain iron, selenium, calcium, zinc, vitamin E and some B vitamins.. According to a study, Regular consumption of walnuts may help reduce the potential prevalence rate of diabetes by improving metabolic syndrome risk factors.

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As per a study, published in the journal Nutrition Research and Practice, consuming walnuts may bring positive changes to metabolic syndrome status by increasing high-density lipoprotein (HDL) or "good" cholesterol and decreasing fasting glucose level. Consuming walnuts daily could contribute to alleviating potential prevalence rate of diabetes by favourably changing haemoglobin A1c (HbA1c) and circulating adiponectin levels. HbA1c is the average blood glucose (sugar) levels for the last two to three months.

 Hyun-Jin Park, lead investigator of ICAN Nutrition Education and Research, "This is a very accurate study due to its sophisticated design, such as random group designation and crossover trial with washout (general meal) period inserted.

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According to the researchers,  the improvement rate for the five diagnostic factors of metabolic syndrome, blood pressure, blood sugar, cholesterol levels, abdominal fat and triglycerides, is revealed to be 28.6 per cent to 52.8 per cent. Moreover, 51.2 per cent of participants with metabolic syndrome at baseline reverted to normal status after the 16 weeks of walnut consumption.