Experirment and like Janet referenced try to "eat when you are hungry - stop when you are full". For me, experimenting with different eating times and spaces between meals and sometimes even doing a 23.99 hour fast started to help me dial into what "feeling hungry" was. This didn't happen over night and I'm still exploring it almost a year and a half later.
One of my first learnings was how I would start to "feel hungry" according to the clock. I still do but have been able to learn to observe the feeling more closely, don't interfere with it by shoving food down my throat right away. Many times the feeling passed then awakened at the next "normal" feeding time - I extinguished it then.
What is "hunger"? I still don't really know. Some describe it as a pit in the stomach, others report a physical reaction of sick feeling, light headedness, shakey, etc.. I feel really none of these, never have. My hunger appears to be a mental loop I get in thinking about the thought of eating. When I recognize this I have a chance to break the loop and not eat, or, consider eating if I think it's the appropriate thing to do at the time.
Sorry for the ramble, I got up too early
If you are only eating once or twice a day I'd continue that pattern, substituting the new foods on your plan. You many find your hunger increases or decreases to the point where you are not interested in eating for an entire day. Take advantage of that if it happens
You will do well.