Basal rate, in biology, is the rate of continuous supply of some chemical or process. In the case of diabetes mellitus, it is a low rate of continuous insulin supply needed for such purposes as controlling cellular glucose and amino acid uptake.While these sweet treats are delicious, they require a dramatic increase in basal rate to account for the spike in glucose in the blood streamWhen one exercises, one requires much more glucose to fuel their body, causing a decrease in basal rate. Basal rate, in biology, is the rate of continuous supply of some chemical or process. In the case of diabetes mellitus, it is a low rate of continuous insulin supply needed for such purposes as controlling cellular glucose and amino acid uptake.