Ihave been back on phen 3 weeks now and 4 pounds lost,that is nothing like the weight losses I see here.It can be very frustrating! I know everyone is different but 4 pounds ****s.I go back diet doctor next week,gee I hope it will be at least 5. He told me to aim for 5,I take Synthroid and have no thyroid but I lost 8-10 a month last time on phen. I do need to increase exercise I know.What do people that lose 15-20 pounds in a week or month eat!!!