It does hit you harder and faster if you have not eaten but sometimes makes me feel queezy at the same time. As cherry said, a little snack before hand. Then when you get the munchies, go crazy!!
On a side note, I tried 1.5ml of my new bottle earlier with a line of coke, did this three times in the space of 2 hours, decreasing my G dose each time by 0.5ml. Had a great time, in and out of consiousness and just generally feeling good! Going to get in bed now with another line, another 1ml and the PS3!!