How long can you not eat? How long can't you eat?<br/><br/>Are they the same?<br/><br/>What can't you do? What can you not do?<br/><br/>Are they the same?<br/><br/>How long can I not eat before a blood test?<br/><br/>How long can't I eat before a blood test?<br/><br/>Are they the same?