Several comprehensive studies and meta-analyses have demonstrated that after a few months or even a year of a low carb diet versus a moderate/high carb diet, there are no significant differences in the amount of weight lost (2,3,4,5).  I will say, however, most of these diets are NOT keto and are simply lower carb (i.e. 20%).  Also, long-term effects (beyond 1 year) are not often studied due to budgetary constraints, so interpret results as you wish.
The ketogenic diet has the potential to decrease blood glucose levels. Managing carbohydrate intake is often recommended for people with type 2 diabetes because carbohydrates turn to sugar and, in large quantities, can cause blood sugar spikes. If you already have high blood glucose, then eating too many carbs can be dangerous. By switching the focus to fat, some people experience reduced blood sugar.
I have been on a low carb diet for over 2 years. I was diagnosed a diabetic with a blood glucose over 400 mg/dl and an A1C of 12. I tried my doctors recommendations for about a year and took all the medications they told me to take. not much changed. they wanted to put me on insulin after a year. I told my doctor that I thought I could control my condition with diet and he said, “you are to far gone for that”.

Blueberries are lousy with antioxidants, satiating fiber, potassium, and more, and according to researchers at the University of Michigan, the colorful fruits may also encourage weight loss. In a study of laboratory rats, scientists found that after 90 days the rats who received blueberry-enriched powder as 2 percent of their diet had less abdominal fat, lower triglycerides, lower cholesterol, and improved fasting glucose and insulin sensitivity, than the rats who weren’t given any blueberry-enriched powder.
A ketogenic diet helps control blood sugar levels. It is excellent for managing type 2 diabetes, sometimes even leading to complete reversal of the disease. This has been proven in studies. It makes perfect sense since keto lowers blood-sugar levels, reduces the need of medications and reduces the potentially negative impact of high insulin levels.
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