This is likely due to better glucose and insulin control (Alzheimer's disease is often called type 3 diabetes), as well as production of ketone bodies for fuel. (functionalhealthnews.com)
A dietary intake of about 50 grams or less per day of net carbs while also keeping protein low - to - moderate is usually low enough to allow you to make the shift to nutritional ketosis (the metabolic state associated with an increased production of ketones in your liver; i.e., the biological reflection of being able to burn fat). (nutritionmayhem.com)
During very low carbohydrate intake, the regulated and controlled production of ketone bodies causes a harmless physiological state known as dietary ketosis. (jissn.biomedcentral.com)