A balanced diet is very important for the health of your breasts. Yo-yo dieting makes you lose enormous amounts of weight in a short period of time, only to gain it back on later, and this strains the skin tissue. Gaining and losing weight repeatedly has been shown to cause the breasts to drop. The skin tissue can’t indefinitely snap back into place when the weight comes back off again, but it will stretch to accommodate the weight gain. Try to maintain a steady weight or a proper nutrition in a healthy and sustainable way.