They discovered that animals living in the enriched environment had higher levels of a protein called brain-derived neurotrophic factor ( bdnf ) .
他们发现生活在复杂环境下的小白鼠有一种名叫脑源性神经营养因子（bdnf）的蛋白质水平较高。
One such chemical is brain-derived neurotrophic factor ( bdnf ) a molecule that promotes the growth and survival of brain cells as well as communication between them .
Research has shown that exercise can increase levels of a substance called brain-derived neurotrophic factor ( bdnf ) , which encourages growth , communication and survival of neurons .
Other scientists have found that , in mammals , exercise also boosts the production of brain-derived neurotrophic factor ( bdnf ) , a substance that supports the growth and maintenance of brain cells .
His studies show that alternate-day fasting , with a single meal of about 600 calories on the fast day , can boost the production of a protein called brain-derived neurotrophic factor by 50 to 400 per cent , depending on the brain region .
