A British study has found that B vitamins can reduce brain shrinkage in older people with mild memory loss. It【B1】______that B v

A British study has found that B vitamins can reduce brain shrinkage in older people with mild memory loss. It(26)concluded that B vitamins caused an average 1/3 reduction in brain shrinkage among adults who had trouble remembering. David Smith was a leader of the study. He(27)praised the use of the vitamins as simple and safe. He also said researchers do not yet know if B vitamins could(28)prevent or slow Alzheimer’s disease(老年痴呆症).
    Vitamins are important for good health. These complex organic substances help to(29)carry out chemical changes within cells. If we do not get enough of the vitamins we need in our food, we are at risk of developing(30)numerous diseases. Some shrinkage of the brain is thought to happen(31)normally as people grow older. Yet studies have shown a correlation between a larger shrinkage and Alzheimer’s disease.
    The researchers say about one in six people over the age of 70 have problems with mental operations. They say half of these people(32)develop serious loss of mental ability, as in Alzheimer’s disease. Over time, the disease robs people of their memories. Finally, it(33)takes away their ability to care for themselves.
    Prof. Smith had a warning for older adults worried about memory loss. He said they should talk to their doctors before starting to take the vitamins. He added that the vitamins could speed the(34)growth of some cancers. The results did not show a difference in loss of abilities such as(35)attention, language and memory. That was true whether or not the people took the vitamins.