Hi. It is quite normal to feel hungry if you are doing the diet properly. The Macrobiotic food you eat is quickly digested and this is why you get this hungry feeling. This will pass but it may take quite a few months.
Make sure you chew well, it will help you eat less if this is your desire.
The standard Macrobiotic diet used to be that your Organic brown rice should be equal to half the volume of the food your ingest. Not many (including myself) have ever achieved this.
Take care
Patrick