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unable to feel full

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    Posted: Aug 09 2012 at 10:19am
Our user asked: "Earlier today a did an intense mass building ab workout. Before the
workout (breakfast) I had eaten fine and felt normally full. After the workout, for the rest of the day, I was unable to get full with my meals (even as bigger meals) it felt as thought the food was just congested and my stomach never felt full, just hungrier. I mean it could just be the ab workout but I'm not totally sure. Can't be any tapeworm or parasite because I'm sure I haven't eaten any raw meat or contaminated water. Any possible info could help."
 
Ask a PT Response: "Hmmmm....Well, there are a few possibilities that I can think of that may contribute to this, but probably do not explain the whole story.
 
First, it could simply be an increased metabolism after exercise. After the intense workout, many things including hormones, HR and breathing, and body temperature will be increased. In addition, lactate is being converted to glucose, muscle and blood 02 is being restored, and PC is being resynthesized. This leads to the concept of 02 debt or epoc (excess post oxygen consumption). Simply stated, the body's metabolic requirements remain at an elevated level even after exercise has commenced. Although this generally does not last long enough to affect feeling full, it may be part of the equation.
 
Part of epoc involves elevated hormones, especially of Epineprine and Norepineprine. This in turn affects the nervous system and its ability to release or store glucose in the bloodstream. It also creates a response from the fight or flight dilemma, thus increasing and redistributing the body's demand for energy for survival. These effects could influence the body's metabolism and contribute to not feeling full, since that is no longer a primary concern in this state.
 
Lastly, the hormone Ghrelin has been found to be associated with increased hunger and appetite along with weight loss, whereas the hormone YY decreases appetite and increases feelings of satiety. Exercise has been shown to decrease Ghrelin release and increase YY activity. Thus it is possible that this increase in YY has contributed to "not feeling full."
 
If you are still having issues, definitely consult with your MD."
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