I think what the lady on the playground was referencing was an English study from Oxford that talks about the foods you eat affecting the sex of your baby. The diet modification needs to take place before you get pregnant because baby gender is decided at conception.
If I recall the article correctly, eating a lot of fruit, particularly bananas and other high potassium or alkaline foods, produces a male.
Moms who have lesser caloric intake and eat a more acidic diet high in calcium and magnesium and sodium during conception time tend to have girls.
You can Google ”foods to determine baby’s gender” and get a ton of results. The study has been widely knocked by many and I personally believe God’s will is the decider but I also believe food has a huge affect on our body chemistry. My aunt has successfully fended off an aggressive cancer for two years with an alkaline wheat and sugar free diet.
I will say that I had a girl and was dieting to get my weight down before pregnancy and I rarely eat breakfast until I am up a couple hours, I also love a lot of the foods said to produce a girl…also I hate drinking milk but during my pregnancy I couldn’t get enough of it. My sister on the other hand had a boy. She is a banana addict eats at least one a day and as a vegetarian her diet consist of a lot of vegetables, soy products, and fish again foods said to produce males. Also, during her pregnancy she craved meat and began to eat some poultry and steak even though she hadn’t eaten any in the 10 years prior to pregnancy and hasn’t since.
Take it however you want but I guess if you desperately want one gender over another then it’s worth a try.