8. Breasts get fat 乳房也會“增肥”

In your 20s, your boobs are made up of fat, milk glands and collagen -- the connective tissue that keeps them firm. But as you age, the glands and collagen shrink and are replaced by more and more fat. Instead of making your bra size go up, however, the added flab can send breasts down, closer to the floor, if you catch our drift.

20多歲的女性乳房主要由脂肪、乳腺及膠原蛋白構成。（膠原蛋白的主要生理機能是做為結締組織的粘合物質，為相關結構提供穩定而有力的支撐，乳房的堅挺就要歸功于它們。）隨著年齡增長，乳腺和膠原蛋白萎縮，被越多越多的脂肪取代。但乳房并不會因此增大，反而會松弛下垂，似乎再也無法抗拒地心引力。