Regardless of your weight- if your BMI is 14, 24, 34, or 54- what you're talking about sounds like a really unhealthy attitude to have, and is, frankly, incredibly worrying. You need to eat to keep yourself going, even if you're at a higher weight than you want to be. If your feelings about food are so strong that they override natural feelings of hunger and desires to eat, it definitely sounds like a medical issue, as was stated above. You need to see your doctor if you're not eating or you don't want to eat despite needing to.