B.M.I. & ALZHEIMER’S: Studies have found an association between Alzheimer’s and the low BMI of thin people. The findings suggest this is not a causal relationship. Find out more.
Washington, DC – A 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.”
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.
- 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.
- “Body Mass Index and Risk of Alzheimer Disease: a Mendelian Randomization Study of 399,536 Individuals,” https://academic.oup.com/jcem/article-lookup/doi/10.1210/jc.2017-00195.
The Endocrine Society
Endocrinologists are at the core of solving the most pressing health problems of our time, from diabetes and obesity to infertility, bone health, and hormone-related cancers. The Society has more than 18,000 members, including scientists, physicians, educators, nurses and students in 122 countries. To learn more about the Society and the field of endocrinology, visit our site at www.endocrine.org
The heading is misleading then as the study shows that low BMI is not linked to being at greater risk of developing Alzheimer's. What they do think is linked is that those with Alzheimer's often have a lower BMI due to loss of appetite or possibly forgetting to eat well.
Excellent point! Thank you for pointing that out. The title is now officially changed to:
Why More People with Alzheimer's Are Skinny