What is a High Insulin Level?

High insulin levels are levels of the hormone that are higher than they should be after ingesting glucose.

Insulin is a hormone (a chemical substance that acts as a messenger in the human body) that is secreted by an abdominal organ called the pancreas. It controls the breakdown of carbohydrates, fats, and proteins in the body. It also guides the liver and muscles to store glucose and fat that can be used during periods of increased energy requirements and fasting.

Insulin is a "key" that unlocks the cell gates so that glucose from the blood enters the cells. The cells of the muscle and fat tissue are dependent solely on insulin for glucose uptake and use.

The lack of insulin in the body or inefficient insulin action at the cellular level causes blood sugar levels to spike (hyperglycemia). Hyperglycemia is the hallmark of diabetes mellitus. Insulin is the only hormone in the body that can prevent hyperglycemia.

Insulin levels in the blood can be interpreted using a simple blood test that is performed after eight hours of fasting. This test must be performed in individuals with suspected insulin resistance or as a part of a hormonal panel in metabolic syndrome evaluation.

The normal values of insulin are as follows:

Some individuals require higher-than-normal amounts of insulin to maintain their blood sugar levels. This condition is called hyperinsulinemia. It is often found to co-exist with insulin resistance.

Insulin resistance is a state in which a given insulin concentration does not cause an expected dip in blood sugar levels.

Insulin resistance may be caused by the following:

• Antibodies to insulin or to the site in the cell where insulin binds (seen in autoimmune diseases such as systemic lupus erythematosus and Hashimoto's thyroiditis).
• Suboptimal quality insulin (less effective insulin) as seen in people with certain genetic diseases.
• Genetic tendency to insulin resistance as seen in people of Latino, African American, Native American, or Asian-American heritage.

Certain conditions may cause temporary insulin resistance and resultant hyperinsulinemia, but as soon as the underlying cause is corrected, insulin resistance goes away. These conditions include long-term stress, infections, long-term sleep deprivation, obesity, and pregnancy. These conditions release the stress hormones in the body. Stress hormones are a known cause of insulin resistance and high insulin levels.

The other causes of high insulin levels that may need medical intervention are as follows:

• Compensatory hyperinsulinemia
  • Prediabetic state
  • Type II diabetes mellitus
• Metabolic syndrome
  • Metabolic syndrome is a cluster of multiple maladies including:
    • High blood pressure
    • High blood sugar
    • Excess body fat around the waist
    • High insulin levels
    • Abnormal cholesterol levels
• Drugs
  • Steroids
  • Over treatment of diabetes with insulin
• Genetic
  • Congenital hyperinsulinism (mutation in the insulin-secreting gene)
• Tumors of insulin-secreting cells
  • InsulinomasNesidioblastosis
• Hormonal disorders
  • Polycystic ovarian disease
  • Acromegaly
  • Cushing's syndrome
  • Hypothyroidism

High insulin levels often have no clinical symptoms and may go undetected. Rarely, they may cause recurrent low blood sugar, which may be seen as palpitations, irritability, sweating, and hunger pangs. Some individuals with long-standing insulin resistance may develop skin tags over the neck and armpits. Others may have dark underarms and groins (acanthosis nigricans).

The following are the consequences of high insulin levels:

• High insulin levels generally translate into an overworked pancreas. This may be followed by the exhaustion of the pancreatic cells, resulting in the development of diabetes mellitus.
• Diabetes further brings on complications such as heart disease, nerve damage, eye damage, and kidney damage.
• High insulin levels have been linked to the development of certain cancers, such as cancer of the gut, although it is not proven conclusively.
• Non-alcoholic fatty liver disease (NAFLD) is a dysfunction of the liver due to increased fat deposition inside the organ. It is seen in individuals with insulin resistance.
• High insulin levels hasten plaque buildup in the large blood vessels, causing atherosclerosis (blockages).
• High levels of insulin affect the estrogen-progesterone ratio in the ovaries and may result in polycystic ovarian syndrome (PCOS), which may cause irregular periods and infertility in young women.