What can I do about my friend being a bad influence?

My best friend and I have been friends for ten years. We were once both carefree, loved eating junkfood and spending lots of money. Things have started to change for me. I am now having a child in April, when my friend found this out, she immediantly started accusing me of starving myself when I'd prepare a salad to go with my burger, and basically forced me to eat junk food. I also lived with her for a week to take a break from my ex, and she lived off of pop tarts, chips, and fast food. She kept telling me fat women have healthier babies (even though I have already gained 20 pounds) and that I should stop eating so many vegetables.

I started to become fatigued so I went to a doctor and was diagnosed with iron deficiency and high blood sugar and told me she could tell that I hadn't been eating properly...my friend still doesn't take nutrition seriously at all and doesn't even understand the concept of diabetes, heart disease etc...

Now that she's been on vacation for a few weeks I've become a lot healthier in my eating, while still adding the extra calories with healthy stuff like avacados and cheese. The problem is I eat emotionally and I am afraid when she returns she is going to force Mcdonald's down my throat again...Can anyone offer some online articles of the hazards of eating SATURATED fats vs. Healthy fats while pregnant?

I also want to tell my friend in a kind way that she is not being helpful to me with what she is doing and saying, and that she is wrong (which she'll never believe). It is too difficult for me to simply cut her out of my life.

Now that I am having a child I am afraid her junk food addiction will be brought into my child's life.