A pre-diabetic condition known as insulin resistance increases the risk of developing type 2 diabetes and metabolic syndrome. In type 1 diabetes, the pancreas does not produce insulin. In type 2 diabetes, the problem is insulin resistance—the body still produces insulin, but cells respond poorly to it.

Diets high in sugar and refined starches can contribute to increased insulin demand over time. As insulin levels rise repeatedly, the body may become less responsive to the hormone, setting the stage for elevated blood sugar.

Insulin resistance is also associated with metabolic syndrome, a cluster of risk factors that may include:

  • Elevated triglycerides

  • Low HDL cholesterol (“good” cholesterol)

  • Increased abdominal fat

  • High blood pressure

Many people with insulin resistance gain weight around the abdomen, although insulin resistance can occur at any body size.

Exercise Improves Insulin Sensitivity — Even Without Weight Loss

Research published in Diabetes Care (2003;26:557–562) followed 18 sedentary men and women for six months. Participants walked for 30 minutes per day, three to seven days per week.

Key findings:

  • Insulin sensitivity improved

  • Blood lipid markers improved

  • No weight loss occurred, yet metabolic health still improved

The researchers concluded that moderate, regular exercise can improve insulin sensitivity and metabolic markers independently of weight loss. Even without changes in abdominal fat, exercise reduced indicators associated with the development of type 2 diabetes.