The Two Big Roles of Insulin
Your medical team will decide which insulin(s) and doses your child needs to start with, so you don’t need to worry about that at first, focus on getting into the routine of it first.
While I quickly realised that there are the two main types of insulin (Basal and Bolus), it took a while before I realised that there are different versions of Bolus insulin as well, so this page aims to explain all of that without going into the individual brand names out there.
Doctors usually think about insulin in two main roles:
1. Background (Basal) Insulin
This insulin works slowly and steadily throughout the day and night.
Its job is to cover the body’s basic needs between meals and while sleeping—even when your child isn’t eating at all.
- It typically lasts many hours
- It doesn’t have a strong “peak”
- It helps keep blood sugar stable in the background
You might hear this called long‑acting or basal insulin.
2. Mealtime (Bolus) Insulin
This insulin is taken for food and to correct high blood sugar.
It acts more quickly and helps manage the rise in blood sugar that happens after eating.
There are different speeds of mealtime insulin:
- Some start working very quickly
- Others work a bit more slowly but last longer
Mealtime insulin is often called rapid‑acting or short‑acting insulin.
Common Types of Insulin You May Hear About
Although there are many brand names, insulins are usually grouped by how fast they start working and how long they last:
- Rapid‑acting insulin
Starts working quickly and is usually used around meals. - Short‑acting insulin
Works a bit more slowly and lasts a little longer than rapid‑acting insulin. - Long‑acting and ultra‑long‑acting insulin
Provides steady background insulin for most or all of the day or night.
Your child’s care team will choose the type—or combination—that best fits your child’s age, lifestyle, and medical needs. The below graph gives a visual of how these different types work over time (the graph is illustrative only, actual results vary by brand, child, dose, injection site etc).
Why More Than One Type Is Often Used
The body normally releases insulin in different ways: a small steady amount all the time, and larger bursts when we eat. Using both basal (background) and bolus (mealtime) insulin helps mimic how a healthy pancreas works and gives your child more flexibility with meals and daily activities.
Needing multiple types of insulin does not mean diabetes is harder to manage—it means treatment can be more precise and flexible. Over time, insulin routines become just another part of daily life, and your child can still eat, play, learn, and grow like any other child.