I'm Just Saying had a question last week:
I want to take an appetite suppresant (diet pill) from Walmart but how much do you feel really goes through the breast milk? I have been really good at my choices of healthy foods and making sure I am careful for her but I have just cant lose the last 8 or so pounds from my pregnancy. I haven't taken anything and I just want your advice ..
I actually don't know much about appetite suppressants, but my first impulse is to direct you to Thomas Hale's book, Medications and Mother's Milk. It's updated every 2 years and it is pretty much considered the go-to book on breastfeeding and medications. It looks at how the medication affects both the child and the mother's supply. Libraries don't normally have it, but if you can find an IBCLC or an LLL leader, they should know someone who has a copy and can direct you there.
The sad news is that many moms find that breastfeeding is what keeps those pounds on. I've heard it explained that your body has to be ready to have extra stores of nutrients in case you suddenly find yourself in famine. I personally think of it like hormonal birth control. Sometimes hormonal birth controls causes a woman to gain 5 or 10 pounds simply because the hormonal make up of her body has changed and it can't be lost until you go off the birth control. Well, when you're breastfeeding, the hormonal make up of your body is different from when you weren't and it's going to cling onto the pounds until weaning.
Now, just like not every woman gains weight when going on the pill, not every woman's body is going to cling to those extra pounds while breastfeeding. But unfortunately, you don't know if you're one of them until you try.
So in conclusion: try a finding that book and be patient with yourself. I'm sorry I don't have a copy myself. I should get on that! I hope that answered your question.