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Likewise, increased use of the osteoporosis drug raloxifene (Evista), which has also been shown to have a protective effect against breast cancer, could have played a role.
CNN: Falling breast cancer rates: What's behind the numbers?
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At that moderate level, alcohol can have a protective effect on your heart.
CNN: updated
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There is little evidence to show that handguns have a protective effect.
FORBES: Connect
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"Importantly, even partial adherence to statin therapy conveys a mortality benefit, suggesting that statins do not need to be taken daily to have some protective effect, " said Dr Francis.
BBC: 'Give out statins with junk food'
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Researchers at Rush Medical University found that mentally challenging activities, such as reading and playing chess, may have a protective effect on the brain and help lower risk of dementia associated with Alzheimer's disease.
CNN: Vital Signs health tips
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Researchers don't know why a plant-based diet seems to have a protective effect, but one likely reason is the nutrient profile of vegetarian diets, which tend to be higher in fiber and lower in saturated fat.
WSJ: Vegetarians Live Longer Than Meat-Eaters, Study Finds
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Some, but not all, previous studies have shown a protective effect of pre-eclampsia on breast cancer, although such research has been carried out mainly in northern Europe and North American populations.
BBC: NEWS | Health | Pregnancy disorder link to cancer
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But while there is pretty much consensus within the scientific community about the protective effect these oils have on the heart, their impact upon the brain - whether to lift depression, curb violent urges, or simply to boost concentration - are less well documented.
BBC: NEWS | Health | Fish oil: a cure for young offenders?