Insulin is a hormone made in pancreas, allowing your body to use glucose for energy
There is a measure for how much a particular food increases your blood sugar: the glycemic index, or GI. When carbohydrates in a food get converted quickly, that causes a spike in insulin, which your pancreas releases to prompt cells to absorb the glucose. The hormones that your body releases in response can make you feel hungry. The higher the GI, the higher the blood sugar level. If you eat high-GI foods often, the repeated stressing of your insulin-producing machinery may have other effects, such as increasing your risk for diabetes.
insulin resistance - is when there is a lot of glucose in the blood and body ignores insulin to use it for energy – and it's a vicious cycle where body dumps more insuline bcs nobody responds to the insultin – really well explained by Ali