What are the risk factors associated with obesity? Animals eat impulsively because they are conditioned to do it for survival. For all life on the planet Earth, food is not a choice. It is a daytime job of survival. The hardest thing for an animal in the wilderness is to gain weight. Hardest thing for us is to lose it.
One of the first scientific studies on what hunger does to the mind was observed in a study remembered as the Minnesota Starvation Experiment performed by the University of Minnesota back in 1944.
For our entire evolution, we were like any other species on this planet in constant search of food. We were not obese but in a state of constant hunger and constant physical activity. This was the case for all of our ancestor species and that means the time period of 50 million years. The feeling of constant fullness, on the other hand, is not natural, and it is an example of maladaptation.
When we see a hamburger, it is supernormal stimuli. When we see any food item that does not exist in that form in nature, especially if it combines any form of fat and sugar, it is supernormal stimuli. Frequently overeating highly palatable foods saturate the cerebellum with a significant amount of dopamine that forces the brain to ultimately adjusts by desensitizing itself, decreasing the number of cellular receptors that identify and respond to the neurochemical.
In nature, there is no free sugar or free fat. Energy is stored in complex whole food packages and one or the other form. Our brain had never been exposed to refined sugar or fat before and especially never been exposed to a combination of the two in high doses all at once.
We are maladapted to our habitat. We have evolutionary evolved and conditioned processes that force us to act in an evolutionary protective manner such as overeating on food. For all life on the planet Earth, food is not a choice. The hardest thing for an animal in the wilderness is to gain weight. The hardest thing for us is to lose it.