Something with a lot of spice and acidity such a taco meat and peppers is especially harsh after not eating or starving because your stomach becomes more sensative. The body''s digestive system is smart. It adapts to starvation by changing (I'm not a doctor so I don't have a medical explaination) but the enzymes, stomach acid, etc is constantly changing in order to utilize the nutrients you're putting in your body. Starvation shuts down the metabolism in order to save energy. Then, if you eat something that is harder to digest (protein, sodium, fat) your digestive system can't handle it. If you find yourself in a situation where you have starved, the first thing to graduate from nothing is probably fruit juice, then fruits and vegetables, legumes, nuts, grains, then onto the things that are the most complex for your body to process like meat and dairy. I hope this helps explain.
Also, eating disorders mean disordered eating. It doesn't have to be caused by an obsession with food. If you have something else that is mentally affecting your eating habits, it is still disordered eating.
Sometimes I don't want to eat, but once I start to I realize that I am actually hungry. Just try to eat something, even if it's just a little, like an apple or some toast.