7 Healthcast: You are what you eat: Diet and the sex of your baby

Joanne Yang thinks so.

Her baby boy is coming soon and the mom-to-be believes what she ate before conception, protein and a lot of potassium, made her womb more hospitable to the XY combination of chromosomes that creates a boy.

Several websites will tell you they have the dietary secrets to select the gender of your baby, for a price.

GenSelect offers a diet plan and supplements starting at $200 dollars for a one month supply, with a full money back gender guarantee.

For a quarter of the cost, BoyGirlDiet.com offers a similar package, a diet plan and vitamin supplements for $60 dollars each.

"It's all natural and it's simple," says Boy Girl Diet founder Nancy Reilly.

Reilly says it's been on the market for five years and has helped hundreds of couples.

"We have roughly 95-96 percent success rate," she says.

Samantha Whitman is among the successful.

She was already mom to Gavin, Logan, and Cameron.

"I just knew we had to try something different this time so we could get the girl," she says.

Samantha says she followed the "girl" diet plan, cut out chocolate and salt and ate the recommended dairy and veggies.

Baby number four is now here and her name is Emerson.

Most of the plans say eating lots of calcium rich foods, tofu, and lean protein will give you a girl.

If you want a boy, pass on the milk and yogurt and add in the bacon, sausage, and burgers.

OB/GYN Dr. Angela Pollard says she doesn't see harm in eating what's advised, but she's reluctant to recommend the supplements because vitamins aren't required to have FDA approval.

"You have to be very careful, and unless you know what's in there I'm not sure I'd be taking them," Dr. Pollard warns.

She says the key to this plan and others on the market is in the section about timing intercourse with ovulation, early if you want a girl right on time if you want a boy.

"Is the sperm going to reach its mark at the time of ovulation or before or after ovulation and that really has very little to do with the diet," she explains.

Dr. Pollard says ovulation timing gives you about an 80 percent chance of ending up with pink or blue, not quite the success rate claimed by the diet plans, but it's the plan with the most research behind it.

Finally, always check with your doctor before you try any new diet plan, especially if you're trying to get pregnant because too much of certain vitamins and minerals can have a negative impact on ovulation.