, the mechanisms involved in the development of an<unk> , associated with the transition from healthy committed<unk>  to compulsive<unk> , are unknown.<unk> , however, has long been known to begin with a desire for physical fitness. An eating disorder, such as anorexia nervosa or bulimia supports an unhealthy obsession with<unk> , as such. A body image disorder can likely cause<unk>  as well. One of the prevailing mechanisms for this<unk>  lies within these activities that expose individuals to the mood-altering effects of this behavior, and can many times deposit dopamine directly into the blood flow. The chemical functioning of the brain may also play an integral role in potential mood changes based on<unk> . Griffiths reported a lengthy case study of<unk>  and laid out three viable prospects of biological mechanisms that pair an improved satisfactory mood with<unk> : * The Thermogenic Hypothesis:<unk>  is said to increase body temperature, thereby diminishing somatic anxiety. This decrease in anxiety can be related to a higher temperature in certain regions of the brain. * The Catecholamine Hypothesis:<unk>  releases catecholamines, a group of substances in bloodstream (usually in response to emotional/physical stress) which regulate our mood, attention, and movement as well as endocrine and cardiovascular responses that are linked to stress levels in our body. * The Endorphin Hypothesis:<unk>  releases endorphins, which are opiates that occur naturally in the body, however, sometimes an enjoyable experience as such, has indirect consequences resulting in irregularity where the increased endorphin production over time entices the individual to continue performing regular intense aerobic<unk> . Such high levels of endorphin production means the brain will have to down-regulate endorphin production, essentially “manipulating” the individual to believe that the<unk>  must be performed daily in order to maintain the new natural balance in the brain. Griffiths' findings suggest that once<unk>  occurs at high frequencies, it must be maintained in a similar manner and is very difficult to break the pattern. Similarly, it can be argued that with reduced voluptuary pleasure from other activities, it is likely that a person may have to maintain such levels of intense<unk>  in order to optimize and activate certain reward systems within the mesolimbic dopamine system in the brain. If they are not activated, the person will continue feeling the original level of distress prior to<unk> .
Exercise addiction
Nicotine dependence
Caffeinism
Nicotine withdrawal
Carcinoid syndrome
Food addiction
Metabolic syndrome
Alcohol intolerance