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Central dopamine is thought to play a significant role in obesity. In support of this idea, animal studies and one human positron emission tomography (PET) study have found reduced postsynaptic D2-like receptor availability in the striatum in obesity, with lower D2 receptor availability associated with higher weight. In addition, reward sensitivity and hedonic responses, known to be related to dopamine function, have also been implicated in obesity and obesity-related eating behavior. These reports have led to the concept that dopaminergic abnormalities (e.g. reduced D2-like receptors) influence reward sensitivity, leading to altered eating behaviors and eventually obesity. However, there are several critical limitations of the human D2 receptor studies that limit the strength of their conclusions and thus the interpretations and speculations embedded in literature that relies on this work. First, estimates of D2-like receptors in humans have been confounded by potential differences in endogenous dopamine release since the PET ligand (raclopride) used is known to be displaceable from receptors by endogenous dopamine. Second, failure to rigorously screen obese individuals for diabetes confounds conclusions, since diabetes has been independently associated with dopaminergic abnormalities such as reduced D2-like receptors and muted dopamine release in diabetic rats. Finally, no human studies have addressed whether reduced D2-like receptor levels are a risk factor for obesity, a consequence of engaging in obesity-related behaviors or being obese or all of the above.
Allocation: Non-Randomized, Endpoint Classification: Efficacy Study, Intervention Model: Parallel Assignment, Masking: Open Label, Primary Purpose: Treatment
meal replacements, psychotherapy, dietary education
Washington University School of Medicine
Not yet recruiting
Washington University School of Medicine
Published on BioPortfolio: 2014-08-27T03:14:57-0400
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We investigated the relationship between psychotherapy outcome and trajectory variables measured during the first five treatment sessions.
The use of more than one therapist at one time in individual or group psychotherapy.
Any form of psychotherapy designed to produce therapeutic change within a minimal amount of time, generally not more than 20 sessions.
A condition of having excess fat in the abdomen. Abdominal obesity is typically defined as waist circumferences of 40 inches or more in men and 35 inches or more in women. Abdominal obesity raises the risk of developing disorders, such as diabetes, hypertension and METABOLIC SYNDROME X.
Forms of PSYCHOTHERAPY falling within or deriving from the psychoanalytic tradition, that view individuals as reacting to unconscious forces (e.g., motivation, drive), that focus on processes of change and development, and that place a premium on self understanding and making meaning of what is unconscious.
Iron or iron compounds used in foods or as food. Dietary iron is important in oxygen transport and the synthesis of the iron-porphyrin proteins hemoglobin, myoglobin, cytochromes, and cytochrome oxidase. Insufficient amounts of dietary iron can lead to iron-deficiency anemia.
Women's Health - key topics include breast cancer, pregnancy, menopause, stroke Follow and track Women's Health News on BioPortfolio: Women's Health News RSS Women'...
Obesity is the condition in which excess fat has accumulated in the body (mostly in subcutaneous tissues). clinical obesity is considered to be present when a person has a BMI of over 30 (Oxford Dictionary of Medicine). It is becoming increasing common i...