Please explain what type 2 diabetes is and what the link is between obesity and type 2 diabetes?

Type I, no insulin: In type i, the pancreas is simply not making enough insulin. Therefore you must provide it. In type ii, there is plenty of insulin. But, the obesity makes the Insulin receptors less effective. This is called peripheral resistance.

Insulin resistance: Type 2 diabetes is the Insulin resistance type of diabetes meaning blood sugar levels go up since the body cells have developed resistance to Insulin levels which cause the sugar to get into the cells. So blood sugar levels remain high. High abdominal fat and obesity are directly linked to development of diabetes type 2 and abdominal fat is a major contributor to Insulin resistance.