If you guessed refined sugars and processed oils, give yourself a gold star. Diets that lead to obesity — specifically diets high in refined sugars and processed oils may cause changes to the brains of obese people that in turn may fuel over-consumption of those same foods and make weight loss more challenging. The problem is that the body exerts a strong defense against undernutrition and weight loss, but applies a much weaker resistance to over-consumption and weight gain — a human behavior food industry scientists have learned to exploit in their favor.
There are very specific principles which influence how appetite control operates and this constitutes one form of vulnerability to weight gain. The expression of appetite is reflected in an episodic pattern of eating behaviour, the selection of dietary commodities and an associated profile of conscious sensations such as hunger, preferences, aversions and fullness.