A recent American study shows that eating fat food increases the desire to eat more food. Fat foods trigger the release of a hormone called ghrelin. This hormone is produced in the stomach and pancreas and stimulates hunger, increases food intake and fat mass. You usually have higher levels of ghrelin before meals and lower levels after meals.
Until recently it was thought that ghrelin kicked into action in case of an empty stomach, but this theory seems to be obsolete. The new study shows that ghrelin only increases while eating fat food. Our brains then get the signal to store these fats.
Not all fats trigger ghrelin production though. Like you now, there are good fats and there are bad fats. ghrelin production is only triggered by saturated fats (the bad ones, think butter, ground beef, chocolate, fats in fast food, …). Unsaturated fats (Omega 3, think fish oil, linseed oil, butternuts, …) have no impact on ghrelin levels.
So, a good tip for fat loss: go easy on saturated fats…