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Old 19-12-2009, 12:01 PM   #2
Animad
 
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Join Date: Jun 2007
Location: UK

It could be that your blood pressure is low and what happens when you move, especially straight after you stand, is that your blood can get moved around before your body can put in mechanisms to stop it and it can move away from your brain; such as if you stand up often blood pools towards your feet before the vessels in your legs narrow stopping the blood do this. This then means your blood isn't where it needs to be and so can cause dizziness/ fainting.

However, also, just after eating normal amounts for one day means that your body is likely to save the energy from that and not use it later as it will be anticipating a future time where it will have none and so it will use as little of that as possible (this is only in the very beginning stages of recovery and recovery is a good thing for your health overall) and so can make you feel like this as a result.

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