We have been conditioned to fear fats for decades, so it is natural that most of us are apprehensive. But in reality it is not as metabolically unhealthy as we have been led to believe when it is not mixed with carbs as shown by flatline glucose charts.
When we monitor our pre/post meal glucose, we soon realize that many supposedly "healthy" grains will spike our glucose and subsequently our insulin levels.
Pork belly is not the only source of healthy fats...you can get it from nuts. cheese, avocado etc but you will probably learn to fuel yourself with your choice of fats/proteins rather than predominantly sugar and carbs.