Puzzles and crosswords delay dementia, study suggests

слабоумие
a serious mental disorder caused by brain disease or injury, that affects the ability to think, remember and behave normally
dementia - dɪ'men(t)ʃə
Example: People who do puzzles and crosswords may stave off dementia longer but experience a more rapid decline once the disease sets in, a study suggests.

stave off
предотвращать, предупреждать (беду и т.п.)
Example: People who do puzzles and crosswords may stave off dementia longer but experience a more rapid decline once the disease sets in, a study suggests.

атака, нападение, натиск
onset - 'ɔnset
Example: Could crosswords hold the key to delaying the onset of dementia?

impairment - om'pɛəmənt
ухудшение; повреждение, упадок
the state of having a physical or mental condition which means that part of your body or brain does not work correctly; a particular condition of this sort
Example: For each additional point those without a diagnosed cognitive impairment saw a 50% slower decline in their brain function, which was examined through a variety of tests.

deteriorate - dɪ'tɪərɪəreɪt
ухудшать; портить; повреждать
to become worse
Example: That the brain is allowed to deteriorate to a larger degree before symptoms like memory loss become apparent could explain why the condition seems to progress more quickly after diagnosis.

Url: http://www.bbc.co.uk/news/health-11152374