What is the primary effect of insulin in the human body?

The primary effect of insulin in the human body is to stimulate glucose uptake after a meal. Insulin is a hormone produced by the pancreas that plays a key role in metabolism and regulation of blood glucose levels. After eating, blood glucose levels rise as glucose from the digested food enters the bloodstream. In response, insulin is released to facilitate the uptake of glucose by tissues, particularly muscle and adipose (fat) tissues, allowing cells to absorb glucose for energy or storage. This process is crucial for maintaining normal blood glucose levels and ensuring that cells receive the energy they need to function properly.

While insulin does have other important roles, such as promoting the synthesis of triglycerides and reducing hepatic glucose production, its primary and most immediate effect following a meal is the stimulation of glucose uptake, making it essential in managing blood sugar levels and energy utilization in the body.