Dementia is not a specific disease. It's an overall term that describes a wide range of symptoms associated with a decline in memory or other thinking skills severe enough to reduce a person's ability to perform everyday activities.
People who have a high body mass index (BMI) are more likely to develop dementia than those with a normal weight, according to a new UCL-led study.
In a recent article, however, a relationship was found between body mass index (BMI) and dementia risk.
The Study: In a study published in Alzheimer’s & Dementia journal, researchers gathered data from eligible large-scale prospective cohort studies that included data on BMI and dementia. Of these, 39 longitudinal population studies from the USA, UK, France, Sweden, and Finland were chosen to equal a total of 1,349,857 participants with no history of dementia. BMI of all participants was assessed before determining dementia. These participants had no record of hospital-treated dementia or dementia deaths and had accrued a minimum of 3 years of follow-up.
The Results: Analysis of 1.3 million adults over 38 years saw 6894 develop dementia. Two decades before symptomatic dementia, higher BMI predicted dementia occurrence: each 5-unit increase in BMI was associated with a 16-33% higher risk of this condition.
What It Means: Past research on how a person’s weight influences their dementia risk have produced conflicting results. This is because most studies do not look at a person’s BMI over a long period of time or because of an association that is confounded by weight loss during the preclinical dementia phase, which causes the harmful exposure to seem protective. Dementia is a well-recognized source of weight loss. As symptoms appear, appetite decreases as well as BMI. Maintaining a healthy BMI throughout life may prevent, or at least delay, dementia.
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Source: Kivimaki, M. et al. Body mass index and risk of dementia: Analysis of individual-level data from 1.3 million individual. Alzheimer’s & Dementia 2017: DOI 10.1016/j.jalz.2017.09.016
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