Insulin: Definition And Types Of Insulin

Insulin is a vital hormone. It helps in the transformation of food into energy and regulates blood sugar levels. If you have diabetes, your body either does not produce enough insulin or does not use it efficiently. Human-made insulin can be prescribed by your doctor and administered through injection (shot), injectable pen, or pump. In addition, insulin powder can be inhaled.

Insulin controls blood sugar in people with:

Type 1 diabetes -the body does not produce insulin and thus cannot control the amount of sugar in the blood) 

Type 2 diabetes -the blood sugar is too high because the body does not produce or use insulin normally) 

Mostly use of insulin is needed when the condition is at a stage where it cannot be controlled by oral medications alone.


What is insulin used for?

Insulin transports glucose from your blood into your body's cells all around. Both meals and your body's natural release of glucose from storage are sources of glucose. As insulin unlocks the cell's doors, glucose may leave the circulation and enter the cells, where it is used as fuel. When insulin levels are insufficient, glucose cannot enter your cells and instead accumulates in your blood (hyperglycemia).

The hormones class of drugs includes human insulin. In place of the insulin that the body ordinarily produces, human insulin is used. It functions by assisting in the movement of blood sugar into different bodily tissues where it is used as an energy source. It also prevents the liver from generating additional sugar. This is how all forms of accessible insulin function. The sole difference between insulin kinds is in how quickly and for how long they start to control blood sugar.


Types of insulin

Since its discovery in 1921, insulin has advanced significantly. There are several varieties available now, each with a different working time in your body.

Several characteristics distinguish various types of insulin:

  • Onset: how rapidly it reduces your blood sugar.
  • Peak: the state of being when something is working the hardest.
  • How long it takes to reduce your blood sugar.


Premixed

Premixed insulins combine a fast- or short-acting insulin with an intermediate-acting insulin. Examples of these insulins are Humalog Mix 75/25 and Novolog Mix 70/30. Prior to breakfast and supper, they are frequently consumed.


Fast-acting

The fast-acting and short-acting insulins are those that start working right away and are often administered before a meal. Examples include the insulin brands Fiasp, Lyumjev, Humalog, Novolog, Apidra, and Regular.


Intermediate-acting

NPH, an intermediate-acting insulin, follows. Typically, this is taken twice day.


Ultra-long acting and long acting

Lantus, Basaglar, Levemir, Toujeo, and Tresiba are some examples of long-acting and ultra-long-acting insulins. To maintain blood sugar levels during the night and in between meals, these are typically administered once per day (sometimes twice).


Is insulin available as a pill?

Over 80 years have passed while researchers have been developing an oral version of insulin. The issue is that insulin is a hormone and that proteins make up the majority of hormones. Proteins, including insulin, are broken down by the digestive system. The digestive process would not allow insulin in tablet form to control blood sugar levels, and it would struggle to enter the bloodstream via the lining of the intestines.

Due to the fact that insulin must be injected or instilled (i.e., through a pump), some people are afraid to use it. Needles are involved with injections and pump infusion settings, so it makes sense that if you're afraid of them, you won't enjoy getting insulin injected. (An inhalable form of insulin is available, but it is an ultra-rapid-acting insulin; a longer-acting insulin is often required and must be administered intravenously.)


Why is insulin important?

Insulin regulates several bodily functions, including blood sugar, in a careful balance. Excessively high or low blood sugar might start to create symptoms if insulin levels are too low or high. If blood sugar levels remain low or high, major health issues might start to emerge.

One hormone that is crucial is insulin. It regulates your blood sugar levels and aids in your body's conversion of food into energy. If you have diabetes, your body either produces insufficient insulin or uses it improperly.

The body cannot use sugar (glucose), which is a crucial source of fuel for the body and particularly the brain, without insulin. In essence, sugar cannot enter the body's cells until a lock is opened on those cells. The key that opens the lock is insulin.


What is insulin resistance?

Insulin resistance, sometimes referred to as decreased insulin sensitivity, occurs when cells in your muscles, fat, and liver don't react to insulin as they should. Insulin resistance can either be acute or chronic, and it occasionally can be treated.


Type 1 diabetes development

Some people's immune systems attack their islets, causing them to stop producing insulin or to generate insufficient amounts.

When this happens, blood glucose does not leave the circulation and cells are unable to take up the sugars to be converted into energy. A person with type 1 diabetes will require daily injections of insulin to survive, and this is the beginning of the condition.


Type 2 diabetes development

Some individuals, particularly those who are overweight, obese, or inactive, have insulin that is ineffective in delivering glucose to the cells and is unable to carry out its functions. Insulin resistance is the inability of insulin to have an impact on tissues.

When the islets are unable to produce enough insulin to combat insulin resistance, type 2 diabetes will begin to develop.

Since the turn of the 20th century, doctors have been able to isolate insulin and provide it as an injectable to patients who are unable to make enough of the hormone on their own or have elevated insulin resistance.