Insulin is a hormone produced by the pancreas in our body and is essential for our body organs to use glucose (sugar)in our blood as an energy source. In other words, insulin is the key that opens the door for glucose to enter in to the body organs. In diabetes, there is either total lack of insulin secretion as in Type 1 Diabetes, or Insulin produced might be too less or unable to act (Insulin Resistance) as in Type 2 Diabetes.Dr Manjunath Malige, Consultant Endocrinologist at Fortis Hospital, Bannerghatta Road, Bangalore, helps us in understanding the A-Z of insulin for diabetes, from how one should use it to understanding at which stage one needs it.
In our body, this is how insulin helps in regulating blood sugar levels.
Following food consumption, blood sugar level rises and this leads to Insulin secretion by the pancreas. Insulin will help body organs take up sugar and thereby, reduces the blood sugar levels. When the sugar level is normal or low, body stops Insulin generation so that the glucose level does not decrease. When body does not produce enough insulin then insulin injections may be needed.
The four major types of insulin available in the market are:
There are various types of insulins as follows:
- Rapid or Short-acting Insulin: Once injected, this insulin starts acting within few minutes and brings down the blood sugar level rapidly. It remains in the body for about 4 hours and suitable to be used just before food as meal – time insulin.
- Intermediate-acting Insulin: Once injected this insulin starts acting slowly by about 1 – 2 hours and will help control the blood sugar level for about 12 hours. This insulin is usually used once or twice daily either before breakfast or before evening dinner. Some intermediate insulins have a mixture or rapid acting and intermediate acting insulin in varying proportions.
- Long-acting Insulin: These insulins start acting rather slowly over a period of 2 – 3 hours and help control the blood sugars level for 24 – 36 hours and hence these insulins are used once daily either in the morning or in the evening.