The shortest answer to this question would be, yes, sometimes fat loss will inevitably lead to a reduction in breast size. Targeted weight loss, otherwise known as spot reduction, has ultimately been proved to be a myth. Yale Scientific states that during a workout routine, the fat your body breaks down to use as fuel can come from anywhere, "not just the part that is being worked the most." The breasts, in turn, are composed of adipose tissue (which is fat), glandular tissue (which is dense), lobules (which produce milk) and ducts (canals that carry the milk to the nipple). The function of the fat in your breasts is mainly protection of the lobules and ducts, which play key roles in child rearing.
If you're in the mindset of weight loss, don't let your boobs scare you away. You could reduce the amount of cardiovascular activity you perform while increasing some resistance training. Certain weight training reps could strengthen the pectoral muscles that lie underneath the breasts. Mike Matthews, a personal trainer, author and creator of Muscle For Life, said that "training the pectoral muscles is a great way to bolster breast size because the muscle sits under the fat, so as it grows, it makes the breasts look larger."
Matthews also noted that genetics is a large determining factor in how much, or if, your breast size reduces. Nicholas Eriksson, leading author of a research study on the genetic variants of breast size and cancer risk, states that in part, breast size is hereditary. A study in the journal of BMC Medical Genetics identified seven genetic factors notably associated with breast size and density. If you have more glandular tissue than fat in your breasts, you may not need to worry about weight loss in those areas. And your genes help determine whether your breasts will be made up more of glandular or adipose tissue. Only a mammogram can show if you have denser or fattier breasts.
But, if weight training isn't your cup of tea and you still want to keep your shape, take a tip from Dr. Martin Eisen, a teacher by profession but community health guru by heart; he said that "simple daily activities like household chores and walking can keep you healthy." Without a rigorous cardiovascular routine, you may find that you stay in shape, stay toned, stay healthy, and stay curvy. Dr. Ethan Gregory agreed, and said "in order to maintain a lean figure – think 80’s aerobics videos – your diet needs to be balanced in such a way that your caloric intake is not too high so you don’t give your body more energy than it needs to be happy and healthy. You can probably stay close to the recommendations from the food pyramids and live an active lifestyle without losing too much breast tissue." Remember to treat your body well, which goes way beyond simply eating right and exercising. Love all that you have, even when what you have changes.
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