A lot of women are curious about foods that increase breast size, as they want to have bigger breasts without undergoing food that makes breast grow and pricey surgical procedures. So in order to naturally increase your breast size you need to give your body more estrogen but not too much-it can lead to estrogen dominance. This is where food comes in to play. There are foods that increase breast size because they will supply your body with the estrogen it needs. There are a variety of different foods out there that are high in estrogen. Mostly herbs and plants, which contain phyto-estrogen.