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Title : The effects of obesity on cognitive decline
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The effects of obesity on cognitive decline

Obesity has the potential to raise an older adult's risk for having difficulty thinking and making decisions (also known as "cognitive decline" or dementia). It is a complex health concern. Body mass index (BMI) is a scale that measures a person's weight in relationship to their height. Research shows that older adults who have an elevated BMI are at lower risk for dementia than people with lower BMIs.

However, BMI may not be the best measure for obesity's effect on dementia. For example, signs such as carrying excess weight in the abdomen (also known as "belly fat"), and having a larger waist size, may better indicate whether a person is at higher risk for problems such as dementia.

Despite the fact that more African Americans are affected by obesity and dementia than other individuals, few studies have examined the link between obesity and dementia among African Americans. Recently, a team of researchers examined this link, and published their findings in the Journal of the American Geriatrics Society.

The researchers used information from the GENOA study. The GENOA study was conducted in Jackson, Mississippi, between 1997 and 1999. It enrolled African Americans with high blood pressure and their siblings (at least one of whom also had high blood pressure). People in the study ranged in age from 35- to 86-years-old. 78% were women and most were obese.

Participants in the study took detailed tests to measure how well they could think and make decisions. Researchers noted participants' body weight, height, waist measurements, and BMI. The researchers assessed the participants a second time between 2001 and 2006, and conducted a final visit between 2009 and 2011.

These key findings resulted from their study, said the researchers:

• Having too much abdominal (belly) fat in mid- or late life was linked to a much higher risk of mental decline.
• Weight loss, weight gain, maintaining a stable weight, and overall obesity were not linked to mental decline.
• Among middle-aged participants, losing weight was linked to higher scores on cognitive tests. Gaining weight was linked to lower scores among middle-aged participants.
• On the other hand, losing weight in later life was linked to lower scores on cognitive tests. Gaining weight in later life was linked to higher scores on cognitive tests.
• Having the combination of a smaller waist measurement and a higher BMI appears to be linked to higher scores on those tests.

The researchers suggest that combining waist measurements with BMI in future studies might be a more accurate way to predict how well a person will retain the ability to think and make decisions in later life.

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