Type 1 diabetes is where your pancreas doesn't make insulin or makes very little.
Insulin is what helps blood sugar enter the cells in your body for energy. Type 1 is also known as insulin-dependent or juvenile diabetes since it usually develops in children, teens, and young adults but it can happen at any age.
To learn more about type 1 diabetes, visit https://www.cdc.gov/.../basics/what-is-type-1-diabetes.html.
Original source can be found here.