Steph, everyone's weight loss is so variable on Phase I. Congratulations on getting through the first week.
Foods with MUFA's (monounsaturated fatty acids) like nuts, olive oil, avocados & canola oil are actually very healthy and helpful for reducing belly and visceral fat. They also make you feel fuller and satisfied, so you end up eating less of other stuff. I eat 2 Tbs. of nut butter a day, plus 2 Tbs of olive oil per day and have lost very well on this plan.