ASUNCIÓN, PARAGUAY — Sarcopenic obesity, which is characterized by excess adiposity and muscle loss, is an “underestimated and underdiagnosed” condition, said the panelists at a session of the XV Latin American Obesity Congress (FLASO 2024) and II Paraguayan Congress of Obesity. The condition often affects older adults but can also occur at any age as a result of unhealthy habits or intensive or repeated weight loss efforts.
“The drugs currently used for managing obesity promote significant weight loss, but by losing fat, muscle is also lost,” said Fabiola Romero Gómez, MD, a professor of medicine at the National University of Asunción and president of the Paraguayan Society of Endocrinology and Metabolism. “We must handle [these drugs] with extreme care. When we employ a strategy that achieves this significant weight loss, we must ensure that the patient receives a good protein intake and engages in resistance exercises, because otherwise, the cure may be worse than the disease.”
Some patients develop sarcopenic obesity after using glucagon-like peptide-1 (GLP-1) analogs, undergoing bariatric surgery, or pursuing restrictive diets, Dr. Romero said in an interview. The condition is more common when there are long-standing cycles of weight loss and subsequent gain, “which accounts for the majority of our patients,” she said.
“An important, largely ignored aspect of weight loss, whether through pharmacological or lifestyle intervention, is that a portion of the weight loss comprises lean muscle,” according to a recent editorial in Nature Medicine. “Weight regain, however, is almost entirely fat. People with chronic obesity often lose and regain weight in repeated cycles, each of which results in body-composition changes (even if they experience some net weight loss). This cycling puts people unable to sustain weight loss at risk of being metabolically less healthy than they were before the initial weight loss was achieved — in effect, at risk of developing sarcopenic obesity.”
A ‘Hidden’ Problem
,” said Dr. Romero.
According to the 2022 consensus of the European Society for Clinical Nutrition and Metabolism and the European Association for the Study of Obesity, clinical signs or factors suggesting sarcopenic obesity include age over 70 years, diagnosis of a chronic disease, repeated falls or weakness, and nutritional events such as recent weight loss or rapid gain, long-standing restrictive diets, and bariatric surgery.
The European guidelines also propose screening in individuals at risk to check for an increased body mass index (BMI) or waist circumference and suspicion parameters of sarcopenia. In this group of patients, the diagnosis should be made based on the analysis of alterations in muscle-skeletal functional parameters, such as grip or pinch strength or the 30-second chair stand test, followed by a determination of body mass alteration using dual-energy x-ray absorptiometry or electrical bioimpedance.
Electrical bioimpedance is Dr. Romero’s preferred method. It is an economical, simple, and easily transportable test that calculates lean muscle mass, fat mass, and body water based on electrical conductivity, she said. Experts have pointed out that bioimpedance scales “will revolutionize the way we measure obesity,” she added.
In an as-yet-unpublished study that received an honorable mention at the 3rd Paraguayan Congress of Endocrinology, Diabetes, and Metabolism last year, Dr. Romero and colleagues studied 126 patients (median age, 45 years) with obesity defined by percentage of fat mass determined by bioimpedance. When their BMI was analyzed, 11.1% were “normal” weight, and 35.7% were “overweight.” Even waist circumference measurement suggested that about 15% of participants were without obesity. Moreover, almost one in four participants presented with sarcopenia, “implying a decrease in quality of life and physical disability in the future if not investigated, diagnosed, and treated correctly,” said Dr. Romero.