The cells convert excess glucose to an insoluble substance called glycogen to prevent it from interfering with cellular metabolism. Because this ultimately lowers blood glucose levels, insulin is secreted to prevent hyperglycemia (high blood sugar levels)
This sentence is logically backwards and misleading.
What It Should Say: "After eating, when blood glucose rises, insulin is secreted. Insulin promotes the uptake of glucose by cells and its conversion into glycogen for storage. This process helps lower high blood glucose levels, thereby preventing hyperglycemia."
The way this is phrased in English implies that long-periods of fasting increases your blood sugar (from what food source?), and then insulin is secreted to prevent hyperglycemia (again, from what food source?). It also implies that glucose cellular uptake somehow increases blood glucose. I read this multiple times before realising that it wasn't my comprehension which was wrong, it is just worded poorly.