Where does the fat come from to increase breast size during a girl’s period if she hasn’t increased her calorie intake?

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Where does the fat come from to increase breast size during a girl’s period if she hasn’t increased her calorie intake?

In: Biology

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Breast size is influenced by a variety of factors beside fat. This includes milk ducts enlarging and contracting, changes to elastin and collagen in the skin, and fluid retention.

She would lose fat from other areas of her body. Or she would have increased her caloric intake without realizing it. Few people eat an exact amount of calories daily and keep a count so closely that they’re always the same. But most likely what is going on is that the body is reallocating calories from one purpose to another.

By definition, a girl must have some caloric reserves, or puberty would be delayed. Menarche (first period) and other signs of puberty don’t happen until body fat percentage reaches a certain threshold, as shown with additional fat deposits in the breasts, thights, and butt. The way female puberty works is that the pituitary gland controls when it happens, signaling the ovaries, but it’s also dependent on body fat percentage. You need to have a certain amount of estrogen to start puberty, and fat cells produce estrogen (though the ovaries are the main source of estrogen). So you won’t go through puberty until you have enough body fat to produce enough estrogen. It’s a feedback loop to prevent fertility until a girl has enough calories to handle menstruation and pregnancy successfully. However: another thing that high estrogen does in addition to encouraging breast size during puberty and bringing on the menstrual cycle, is fusing the growth plates of bones so you don’t get any taller. So basically, a lot of calories are going into growing in height in a girl, and then it switches from growing in height to maturing the body in areas such as increasing breast size. Estrogen acts like a switch, switching off the need for additional calories in one way and switching on the need for additional calories in another way.