Jason Fung has preached against modern processed foods that destroy insulin sensitivity. Even artificial sweeteners can raise Insulin levels. His book "The Obesity Code" is a must read and discusses some of the pathways that link insulin and leptin (a hormone associated with eating)

TLDR; I'm a Fungster: https://www.youtube.com/channel/UCoyL4iGArWn5Hu0V_sAhK2w