I have a LONG history with zoloft and weight gain, going on about 6 years now, off and on the medication. I find myself SO frustrated with doctors (and my husband) who don't acknowledge that my medication is causing my weight gain. When I noticed I continued to gain weight, even after taking long hard walks 5-6 days a week, I began researching side effects and "bingo" found out that weight gain is very common for zoloft users. I weaned myself off and continued to walk. I didn't immediately lose weight, but I at least stopped gaining weight. That was a start in the right direction.
Eventually my doctor suggested wellbutrin, and it had the opposite effect---I lost weight without even trying. I made no changes to my eating or exercise habits and lost weight easily. Now, I did have other problems with wellbutrin, which eventually saw me have to try zoloft again. My mood improved dramatically within a couple of weeks of taking zoloft, but sure enough, after about 2-3 months, I began to gain weight again.
I'm looking for a doctor who's willing to try a cycle of medication for me to control both the depression and the negative side effects of weight gain, but I haven't yet had any takers. I know that zoloft does wonders for me emotionally, but I have to find something else to replace periodically to combat the weight gain.
I'm hoping others here will have some suggestions???
I just wanted to encourage you to insist that your doctor take your weight gain seriously as a side effect of the zoloft and offer an alternative. Exercise and healthy diet are certainly important aspects of treatment, but they aren't always enough to deal with weight gain as a side effect of medication.
Good luck to you.