One thing that will make a person hungry on the Master-Cleanse is if there is anything that is keeping the digestive system active.
Something as minor as chewing gum will do this.
If there is anything at all thats "added" to the cleanse, it could do this.
If your hungry and the protocol is followed correctly then you should look at having more lemonades.
You can have up to 12.
Make sure your drinking spring or purified water and NOT distilled.
After that add a little more maple syrup to each lemonaide.
Then use some blackstrap molasses.
You can use half molasses and half maple syrup to each lemonaide.
The molasses is higher in minerals and other nutrition. It is perfectly fine for the Master-Cleanse as Burroughs recommends it be used by diabetics doing this cleanse.
You could just have a tablespoon on occasion to boost your energy. Or put it in hot water as a tea.
Somewhere in here you should find a remedy and you will have no reason to end the cleanse early as may be recommended by others.