For about 3 weeks, i've barely been pooping. at the moment, i've been eating only one meal a day (to lose weight and help other health issues). i also have a supraumbilical hernia and was wondering if the constipation could be related?

The digestive system is a long tube with several compartments. Everything you put in up top goes through a sequence of changes until it exits, The last compartment removes water & compacts the debris, so constipation is common if stuff isn't moving along normally. If you are eating less (not putting it in) it doesn't push it along to exit. The hernia is of little or no importance.

You may take a fiber laxative like Metamucil and drink enough water daily so that your urine is colorless. For the long term you may try to increase your intake of fiber foods. Consult this site for fiber foods. http://www.mayoclinic.org/healthy-lifestyle/nutrition-and-healthy-eating/in-depth/high-fiber-foods/art-20050948 Wish you good health!