Low-carb diets have been around for years, but adding healthy fat is the new twist. Fats from dairy, nuts, fish and eggs (including the yolk) are healthy, whereas overconsumption of vegetable oils and trans fats can lead to chronic disease. A growing body of evidence shows our 30-year message to avoid fat has been misguided and fat instead is satiating, good for the heart and brain, and, compared to other food groups, has the least impact on insulin release. Swedish diabetes researcher and head of internal medicine at Linkoping University Dr. Fredrik Nystrom agrees. His dietary advice: “Carbohydrate restriction in combination with the high fat Mediterranean diet [fish, some meat, vegetables, cheese, nuts, olive oil]".
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https://www.rd.com/health/conditions/how-to-avoid-becoming-diabetic/