Hi Bonnie:

There wasn't really much said. Basically, a caller asked him why her weight had stalled, then mentioned that she was on Birth Control pills. In response, Dr. Atkins stated that the synthetic hormones (HRT or BCP) will stall weight loss and that it's one of the greatest iatrogenic [my words] reasons for weight gain in women. Iatrogenic means an unfavorable response to medical treatment that is induced by the therapeutic effort itself. He then said the only thing he could recommend is to "hide under the bed". Between the lines, the message was "I don't know what to tell you in half a minute on a TV call-in show".

Now if anyone is interested about natural HRT, here's more info on his site about this issue:
Estrogen & Metabolic Resistance.

I know when I was on BCP, I would gain 4 pounds when on the pills and then lose them when I stopped for the 4th week.