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advise people to maintain a healthy weight to reduce their risk of dementia. But some studies have suggested that obesity might actuallyThe evidence linking obesity to dementia does at first appear to be convincing. For example, we know that being obese in middle age is associated with an
If the obese people were then found to be more likely to have dementia in later life, we could be fairly confident that this must be the cause. These types of trials are rarely possible to conduct, however, as not only are they extremely time-consuming and expensive, they are unethical, too. . This involves following a large group of people for a long time so that the long-term associations between obesity and dementia can be studied.
We found that although there was a clear association between higher levels of obesity and lower cognitive skills in midlife, this probably wasn't because one was causing the other. Without knowing the intelligence levels of children in childhood, we may have interpreted this association between midlife obesity and cognitive skills as being one of cause and effect. In reality though, both are probably just a result of this third factor from earlier in the lifespan.
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