My only advice is never be hungry on this diet, if you are hungry (ie really hungry) then you are not eating enough.

If this is causing a real problem you're going to have to eat a lot of protein and fat and that will do the trick (eg eggs for breakfast - very important not to miss breakfast, and heavy duty meats with the fat eg steak etc).

The 20g limit is only intended for the induction period of two weeks.

If you are following a plan I would strongly recommend buying or borrowing the book. The reason for this is that a lot of stuff is explained in the book and its important to change your mentality to a low carb way of seeing things. Its virtually impossible to do atkins without this change in mindset ie butter is good but margarine isn't, high fat mayonnaise is usually OK but low fat mayonnaise usually isn't etc etc

the best of luck to you both