Summary: Low body mass index does not appear to be a causal risk factor for developing Alzheimer’s disease, a new study reports.
Source: Endocrine Society.
Research clarifies past studies on weight, common cause of dementia.
A new large-scale genetic study found that low body mass index (BMI) is likely not a causal risk factor for Alzheimer’s disease, as earlier research had suggested, according to a study published in the Endocrine Society’s Journal of Clinical Endocrinology & Metabolism.
“Although prior studies found an association between Alzheimer’s disease and low BMI, the new findings suggest this is not a causal relationship,” said the study’s senior author, Ruth Frikke-Schmidt, M.D., D.M.Sc., Ph.D., Chief Physician at Rigshospitalet in Copenhagen, Denmark, and Associate Research Professor at the University of Copenhagen. “The association can likely be explained by the fact that individuals with Alzheimer’s disease are more likely to have low BMIs due to loss of appetite and weight loss in the early stages of the disease.”
More than 5 million Americans have Alzheimer’s disease, according to the Alzheimer’s Association’s 2017 Alzheimer’s Disease Facts and Figures Report. The disease affects the brain and is a common form of dementia. It is the sixth leading cause of death in the United States.
To examine the association between Alzheimer’s disease and low BMI, the researchers analyzed blood and DNA samples from 95,578 participants in the Copenhagen General Population Study (CGPS). Of the participants, 645 individuals developed Alzheimer’s disease.
The researchers analyzed the study participants’ DNA for the presence of five genetic variants that have strong associations with BMI. Based on how many variants were found, participants were divided into four groups to reflect the likelihood of low BMI. The researchers also analyzed data from up to 249,796 individuals participating in the Genetic Investigation of ANthropometric Traits (GIANT) consortium for the genetic variants closely linked to low BMI.
The analysis found the presence of the genetic variants tied to low BMI was not associated with increased risk of Alzheimer’s disease. For comparison, the researchers examined if individuals with genetic variants connected to high BMI were more likely to have type 2 diabetes and did find the expected causal relationship.
“We found individuals with lifelong low BMI due to genetic variation were not at increased risk of Alzheimer’s disease,” Frikke-Schmidt said. “Since genetic variants are not affected by other risk factors or diseases, this is a clean measure that can help to determine causality. The findings highlight that testing causality of a risk factor is pivotal before considering changing public health recommendations based on observational data alone.”
Other authors of the study include: Liv Tybjærg Nordestgaard and Anne Tybjærg-Hansen, of Rigshospitalet; and Børge G. Nordestgaard, of Herlev and Gentofte Hospital. All three also are affiliated with the University of Copenhagen.
Funding: The research was supported by the Danish Medical Research Council, the Lundbeck Foundation, the Alzheimer Research Foundation, and the Research Fund at the Capital Region of Denmark.
Source: Jenni Glenn Gingery – Endocrine Society
Image Source: NeuroscienceNews.com image is in the public domain.
Original Research: Abstract for “Body Mass Index and Risk of Alzheimer Disease: a Mendelian Randomization Study of 399,536 Individuals” by Liv Tybjærg Nordestgaard, Anne Tybjærg-Hansen, Børge G. Nordestgaard, and Ruth Frikke-Schmidt in Journal of Clinical Endocrinology and Metabolism. Published online May 9 2017 doi:10.1210/jc.2017-00195
[cbtabs][cbtab title=”MLA”]Endocrine Society “Study Finds Alzheimer’s Disease Likely Not Caused by Low Body Mass Index.” NeuroscienceNews. NeuroscienceNews, 9 May 2017.
<https://neurosciencenews.com/bmi-alzheimers-6630/>.[/cbtab][cbtab title=”APA”]Endocrine Society (2017, May 9). Study Finds Alzheimer’s Disease Likely Not Caused by Low Body Mass Index. NeuroscienceNew. Retrieved May 9, 2017 from https://neurosciencenews.com/bmi-alzheimers-6630/[/cbtab][cbtab title=”Chicago”]Endocrine Society “Study Finds Alzheimer’s Disease Likely Not Caused by Low Body Mass Index.” https://neurosciencenews.com/bmi-alzheimers-6630/ (accessed May 9, 2017).[/cbtab][/cbtabs]
Body Mass Index and Risk of Alzheimer Disease: a Mendelian Randomization Study of 399,536 Individuals
Recently, data on two million people established that low body mass index (BMI) is associated with increased risk of dementia. Whether this observational association reflects a causal effect remains to be clarified.
We tested the hypothesis that there is a causal association between low BMI and high risk of Alzheimer disease.
Design, Setting and Participants:
Using a Mendelian randomization approach, we studied 95,578 individuals from the Copenhagen General Population Study (CGPS) with up to 36 years of follow-up, and consortia data on 303,958 individuals from the Genetic Investigation of Anthropometric Traits (GIANT) and the International Genomics of Alzheimer’s Project (IGAP).
Main Outcome Measure:
Risk of Alzheimer disease.
The causal odds ratio for a 1 kg/m2 genetically determined lower BMI was 0.98 (95 % confidence interval: 0.77-1.23) for a weighted allele score in the CGPS. Using 32 BMI decreasing variants from GIANT and IGAP the causal odds ratio for Alzheimer disease for a one standard deviation lower genetically determined BMI was 1.02 (0.86-1.22). Corresponding observational hazard ratios from the CGPS were 1.07 (1.05-1.09) and 1.32 (1.20-1.46) for a 1 kg/m2 and a 1 standard deviation lower BMI, respectively.
Genetic and hence lifelong low BMI is not associated with increased risk of Alzheimer disease in the general population. These data suggest that low BMI is not a causal risk factor for Alzheimer disease, and that the corresponding observational association likely is explained by reverse causation or confounding.
“Body Mass Index and Risk of Alzheimer Disease: a Mendelian Randomization Study of 399,536 Individuals” by Liv Tybjærg Nordestgaard, Anne Tybjærg-Hansen, Børge G. Nordestgaard, and Ruth Frikke-Schmidt in Journal of Clinical Endocrinology and Metabolism. Published online May 9 2017 doi:10.1210/jc.2017-00195