what is insulin?
insulin is a hormone produced by the pancreas, an organ located behind the stomach. it plays a central role in regulating blood sugar (glucose) levels and is essential for how the body uses and stores energy.
what does insulin do?
after eating, carbohydrates are broken down into glucose, which enters the bloodstream. insulin is released in response and helps:
- move glucose out of the blood and into cells, where it can be used for energy
- signal the liver and muscles to store excess glucose for later use
- support the storage of fat
- regulate protein synthesis and general metabolism
insulin and blood sugar balance
insulin works alongside another pancreatic hormone, glucagon, in a constant back and forth to keep blood sugar within a fairly narrow, healthy range. insulin lowers blood sugar when it rises after eating, while glucagon raises it when levels fall too low, such as between meals.
insulin and reproductive hormones
insulin doesn't act in isolation from the rest of the hormonal system. it can interact with hormones involved in the menstrual cycle, including oestrogen, progesterone and androgens such as testosterone. when the body's cells become less responsive to insulin's effects, a state often described as insulin resistance, this can be associated with changes in reproductive hormone patterns for some people, which is one reason insulin is often discussed in relation to conditions such as polycystic ovary syndrome.
what influences insulin levels and sensitivity?
a number of factors can affect how much insulin the body produces and how well the body responds to it, including:
- diet and the type and amount of carbohydrate eaten
- physical activity levels
- body composition
- sleep quality
- stress levels, partly through the effects of cortisol
- genetics and certain underlying health conditions
a general note on nutrition
eating patterns that include fibre, protein and healthy fats alongside carbohydrates are generally understood to support steadier blood sugar responses, though individual responses to food vary and no single food or nutrient controls insulin on its own.
if you have concerns about blood sugar regulation, insulin resistance, or related symptoms, it's important to speak with a doctor or another qualified healthcare professional, who can arrange appropriate testing and advise you properly.