Therapist Svetlana Goryainova: some potato dishes cause a sharp increase in blood sugar.
Goryainova said in an interview that the aggressive cooking and chopping of potatoes turns them into a product with a high glycemic index (GI). A high GI is usually inherent in carbohydrate-rich foods – it means that after eating them, the level of glucose in the blood rises significantly in a person's blood. in the blood and can be especially dangerous for those who already have problems with sugar levels, prediabetes, or impaired metabolism.
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“Everyone's favorite mashed potatoes, french fries are dishes that can lead to problems with blood vessels and the heart, especially when there are already metabolic disorders,” Goryainova said in a comment for Doctor Peter.
The nutritionist added that high glycemic such a product as white bread also has an index. According to the specialist, the wheat grain used for its manufacture undergoes intensive processing, depriving it of a shell containing useful nutrients. The doctor said that all products made from white flour, including bread, increase blood sugar levels and are contraindicated for people with diabetes.
Doctor Mikhaleva called unsweetened foods that dramatically increase blood sugar MedikForum.ru wrote that nuts and bananas are good for reducing high blood pressure in women. 
Svetlana Goryainova Healthy lifestyle therapist, nutritionist, candidate of medical sciences