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Body fat distribution
Hormonal factors such as estrogen levels
What this means internally: Genetics influence hormone balance, metabolism, and even certain health predispositions. Women with small breasts are not lacking in any way; in fact, their physiology might make them metabolically more efficient or agile.
2. Hormonal Balance and Body Composition
Smaller breasts often correlate with lower body fat percentages. Since breasts are composed primarily of fatty tissue, women with less fat may naturally have smaller breasts.