since I was less than 10 years old myself when I was diagnosed with diabetes, I can try to explain it the way my doctor did for me. But I have t1, so if I make a mistake, please correct those who understand t2 better
Cells need glucose to live and work. In order for glucose to enter the cells, the hormone insulin is required, which is produced by the pancreas. With t2, the cells become less sensitive to insulin (they can only skip a certain part of the insulin that you have, all people have a different percentage, but imagine for simplicity that it's 60%) and glucose, instead of getting into the cells, remains in the blood (where it does not belong), and the cells starve. The pancreas tries to make sure that glucose from the blood gets into the cells and begins to produce more and more insulin. But with a keto diet, people eat fewer carbohydrates (which are converted by the body into glucose) and the insulin that you have is enough to get all the glucose from the blood into the cells.
Now about glycogenesis. When you eat carbohydrates, your body converts them into glucose, which your cells feed on, but when you don't eat carbohydrates, your liver begins to create glucose from other sources such as fats and proteins. This is called glycogenesis.
Ketones are substances that the liver produces when you don't eat carbohydrates, and your cells can use these substances for nutrition.
Visceral fat is the fat that is found around your abdominal organs. It keeps your organs in the place where they should be, but if there is too much of it, it is more dangerous to your health than if you have a lot of subcutaneous fat.
With the help of a glucose meter, we measure how much glucose is in our blood, that is, we look at whether our cells have "eaten" it or it has remained in the bloodstream. It is considered normal if the fasting glucose level is 3.3-5.5 mmol / l, after eating it is slightly higher (cells are currently eating), but 2 hours after eating the glucose level should return to normal
I hope you're a little clearer now.
And now I'm ready for a lecture about the pre-Raphaelites. To be honest, I adore Raphael and Michelangelo, but I don't know much about their predecessors