Women's breasts age faster after multiple pregnancies – but nursing and hormone replacement therapy are the secrets to …

PUBLISHED: 17:42 EST, 4 September 2012 | UPDATED: 06:41 EST, 5 September 2012

A study of identical twins has shown that breast feeding, daily moisturising and hormone replacement therapy positively affects how a woman's breasts age.

However smoking, drinking alcohol and having multiple pregnancies can accelerate breast aging, according to researchers.

The study, published today, shows how environmental factors, as well as higher body mass index (BMI) and larger bra and cup sizes can make breasts appear less beautiful over time.

Twin Sisters in Tank Tops Side by Side --- Image by Annie Engel/Corbis

Using 161 twins aged between 25 and 74 for the study, plastic surgeon Hooman T. Soltanian of University Hospitals Case Medical Center in Cleveland, Ohio identified specific lifestyle behaviors that can slow the aging process in order to avoid plastic surgery.

According to the American Society for Aesthetic Plastic Surgery, nearly 316,848 women had breast augmentations and 127,054 had breast lifts last year.

Dr Soltanian told ABC News: 'It's very rare that both twins have been through the same exact environmental factors throughout life.

'The idea was that they have the same [breasts] from a genetic standpoint. If we see a difference, it's more likely to be environmental factors.'

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Women's breasts age faster after multiple pregnancies - but nursing and hormone replacement therapy are the secrets to ...