The report was published by Rice University's Baker Institute for Public Policy.
The study involved the analysis of data of over 900,000 Danish elderly people between 2011 and 2016.
The studies were posted in the journal Surgery for Obesity and Related Diseases and Obesity Surgery.
More than 31,000 people who participated in the UK Biobank took part in the research.
The study was published in BMC Medicine.
The study's results were released in Nature Immunology on March 20, 2023.