Eating enough?

Is it possible that I’m not eating enough? Now that I have started fasting, I am never hungry. I never get the sensation of hunger. I will eat at around 4 one meal, but after two bites I feel full. I know I should be eating more so I just eat a full meal (very very small one) and stop. Should I eat more? I have about 100 pounds to lose and am not losing. I keep losing and gaining back the same two. I gave up my coffee with cream and sugar in the morning in hopes to lose some weight. Do you have any insight on what is going on?