I started taking adipex 3 1/2 weeks ago. I have changed my eating habits. I do not eat sweets. I only snack on fruits & vegetables. I only eat half or less of what I normally ate for lunch & dinner. I only drink water. I have even started walking my dog every afternoon & I am now up to a mile & a half. I have only lost 5 lbs! What am I doing wrong? Please help!