it's all about the game of X and Y . there is not any induction of Y to come into play just by eating banana.

that's what i first thought. it's the source (male chromosomes which is compose of X and Y) which decides whether it's gonna be a baby boy or a baby girl. what does intake of calories by the pregnant women has anything to do with it??

but i read an article on test-tube baby fertilization sometime back and this particular claim (or research without substantial proof as of now)  fits well with the evidence from test tube fertilization that male embroys thrive best with longer exposure to nutrient-rich lab cultures. So it takes more nutrients to build boys than girls. In other words, the Y component has lesser possibility of survival in conditions with low-sugar level.

So ladies, start eating lots of high-calories food if you want a boy. else dough-nuts will do, if you're happy with daughters.