My body's reaction to a sedentary occupation

[lethargic_man]

I like my job, but a problem with it (and with sitting reading on a Shabbos afternoon too) is that it only keeps my mind occupied, not my body. My body responds by clamouring for attention: I find myself getting hungry sooner, and more often, than when I'm doing something that involves more than just sitting on my tochus; bad habits like biting my nails also come to the fore.

Does anyone else find this, or is it just me?