Health
This could be why your weight-loss medication isn’t delivering results
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The skyrocketing popularity of GLP-1 receptor agonists has transformed the weight-loss industry, but not all shots are created equal in terms of how they work.
A study published in Nature investigated how genes affect the success of modern weight-loss drugs — specifically, GLP-1s like semaglutide and tirzepatide.
In analyzing genetic data and self-reported weight loss from over 27,000 users, researchers pinpointed a specific variation in the GLP-1 receptor gene (GLP1R) that acts as a “booster” for the drug’s effectiveness.
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Individuals carrying one copy of this variant lost an average of 1.6 pounds more than those without it, according to the findings.
This suggests that genetic testing could eventually help doctors steer sensitive patients toward medications they are more likely to tolerate.
Individuals carrying one copy of a specific genetic variant lost an average of 1.6 pounds more than those without it. (iStock)
“We believe these reports are a step forward in meeting an unmet need for a more informed and personalized approach to weight management,” said study co-author Noura Abul-Husn, chief medical officer at the 23andMe Research Institute in California, in a press release.
While this genetic “boost” is measurable, it remains relatively modest when compared to the total average weight loss of 24 pounds observed across the study population, the researchers noted.
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Beyond genetics, other factors such as age, sex and specific medications remain much stronger predictors of success.
For instance, the study found that women generally saw a higher body mass index (BMI) reduction (12.2%) compared to men (10.0%).
Traditional factors such as age, sex and specific medications remain much stronger predictors of success. (iStock)
The study may also reveal why certain patients experience stomach issues. Scientists identified a different genetic variant that was linked to increased reports of nausea and vomiting.
The presence of this side effect did not impact the drug’s effectiveness, however. Patients with variants in the GLP1R and GIPR genes lost just as much weight as those without it; they simply felt more sick during the process, the study found.
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“GLP-1 treatment decisions are complex, and having access to clinical expertise to help contextualize your genetic results alongside your full health picture is exactly the kind of guidance this report is designed to support,” said Abul-Husn.
Patients with the variant lost just as much weight as those without it; they simply felt more sick during the process, the study found. (iStock)
Dr. Peter Balazs, MD, a hormone and weight-loss specialist serving the New York and New Jersey area, was not involved in the study but reiterated the role of the genetic variants in treatment response and side effects.
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“Notably, there appears to be a drug-specific effect: The GIPR variant associated with these side effects is observed with tirzepatide, but not with semaglutide,” he told Fox News Digital.
Balazs said he was surprised by the extremely wide nausea risk range (5%–78%). “Additionally, the drug-specific genetic dissociation was unexpected,” he added.
Study limitations
The data relied on participants reporting their own weight, which could be subject to bias.
“The data is self-reported and not medically verified, which may affect its reliability firstly,” Balazs told Fox News Digital. “It also does not account for key treatment variables, such as titration, discontinuation or dosing schedules.”
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The 23andMe participant pool may not reflect a diverse, real-world population, he added.
“The study also lacks data on important clinical endpoints, such as diabetes progression, and severe adverse effects, such as gastroparesis or pancreatitis,” Balazs pointed out. “Many of its findings also have not been supported by more clinically and statistically robust studies.”
Patients with the variant lost just as much weight as those without it; they simply felt more sick during the process, the study found. (iStock)
For example, a sub-study comparing these reports to objective iPhone health data suggested that participants might over-report their progress. While users reported an 11.8% loss, electronic data in that subset showed a 5.8% loss.
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As an observational study rather than a controlled clinical trial, it could not definitively prove that the genetic variants caused the difference in weight loss, only that they are associated with it, the researchers noted.
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“I think this article is interesting, raising the possibility of genetic factors, and the use of genetic testing incorporated into further decision-making when picking weight-loss medications,” Balazs said. “However, I would be careful to draw conclusions solely based on this study.”
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Former Attorney General Pam Bondi was diagnosed with thyroid cancer shortly after leaving the Department of Justice last month, according to a report.
Bondi, 60, who left her role at the Justice Department in early April, underwent treatment and is recovering, a source stated.
The thyroid is a gland located in the neck. It makes hormones that are then secreted into the blood, which help the body “use energy, stay warm and keep the brain, heart, muscles and other organs working as they should,” according to the American Thyroid Association.
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Thyroid cancer is relatively uncommon compared to other cancers. Even so, as of 2023, more than one million people in the U.S. are living with the disease.
The National Cancer Institute (NCI) predicts that there will be an estimated 45,260 new cases in 2026.
Former Attorney General Pam Bondi was diagnosed with thyroid cancer shortly after leaving the Department of Justice last month. (Alex Wong/Getty Images)
Risk factors and symptoms
While more common in women, thyroid cancer can affect both sexes. Those with a family history may be more likely to develop it, as well as those between the ages of 25 and 65. Exposure to radiation is also a risk factor, according to the National Cancer Institute.
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Signs of thyroid cancer may include lumps or swelling in the neck, trouble breathing, trouble swallowing, hoarseness and pain when swallowing, per the above source. Anyone experiencing these symptoms should seek medical attention.
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If thyroid cancer is suspected, a doctor can diagnose it in several ways. A laryngoscopy is a procedure where the doctor checks the voice box with a mirror or laryngoscope — a thin, tube-like instrument with a light and lens, per NCI.
Signs of thyroid cancer may include lumps or swelling in the neck and trouble breathing. (iStock)
Blood hormone studies – where a blood sample is checked to measure hormone levels – can also reveal indicators of thyroid cancer. Ultrasounds and CAT scans are then used to check for tumors in the body.
Treatment options
Surgery, radiation, chemotherapy and hormone therapy are the main ways doctors treat thyroid cancer. A new type of therapy, immunotherapy, is being tested in clinical trials.
“Surgery is the primary therapy, followed by regular surveillance and thyroid hormone replacement,” Dr. Marc Siegel, Fox News senior medical analyst, told Fox News Digital.
Bondi, 60, who left her role at the Justice Department in early April, underwent treatment and is recovering, according to a source. (Roberto Schmidt/AFP via Getty Images)
If the thyroid must be completely removed, patients will take hormones to replace the gland’s natural function.
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“Radioactive iodine is added in extensive or more aggressive cases,” Siegel said, but noted that it is “usually not needed.”
The thyroid gland is located in the neck. It makes hormones that are then secreted into the blood, which help the body use energy. (iStock)
Survival rates
The prognosis for thyroid cancer is generally positive and depends heavily on how the cancer responds to treatment, according to NCI.
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Some types are much milder and slower-growing than others. Doctors will also consider the stage of the cancer’s progression.
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The best-case scenario is when a surgeon can completely remove the tumor during surgery. Doctors will also factor in whether this is a brand-new diagnosis or if the cancer has returned after previous treatment.
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The American Cancer Society (ACS) has updated its guidelines for colorectal cancer screening.
The organization released the update in its flagship journal on Wednesday, noting that the new recommendations “re-affirm” that adults at average risk should be screened for colorectal cancer at age 45 and continue through 75, for those with a life expectancy greater than 10 years.
In addition to the standard colonoscopy, the ACS also recommends that patients receive a blood-based screening test in a doctor’s office, which is designed to detect tumor DNA in the blood.
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The ACS also suggested an at-home screening option that looks for hidden blood and molecular markers in stool samples.
These new guidelines reflect recent advancements in disease detection, as well as a “critical shift in public health strategy to expand screening options and lower barriers to access,” the ACS stated in a press release.
The ACS recommends blood-based testing and at-home stool sampling as options for colorectal cancer screening. (iStock)
Dr. Robert Smith, senior vice president of early cancer detection science at the American Cancer Society and senior author of the report, wrote in a statement that colorectal cancer should be emphasized as a “highly preventable disease as much as a treatable one.”
“By offering more screening tools in our guideline update, more eligible adults will be able to participate in lifesaving colorectal cancer testing, helping to close the screening gap and catch more cancers at an earlier, treatable stage,” he added.
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According to the ACS, colorectal screening “dramatically improves survival,” as studies show early-stage detection yields a five-year survival rate of more than 90% in the U.S.
About one in three American adults are eligible for colorectal cancer screening but have not been tested, although ACS research marks colorectal cancer as the top cancer killer of adults under 50.
Colorectal cancer is the top cancer killer of adults under the age of 50, according to the ACS. (iStock)
People at a high risk of colorectal cancer may need to begin screening before age 45 or be screened more often, the ACS added. Those over 85 years old should no longer be screened for colorectal cancer, per the guidelines.
Dr. William Dahut, chief scientific officer at the ACS, commented that “no matter which test you choose, what’s most important is to get screened, and that includes underserved, rural and minority populations.”
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These guideline changes follow a surge in colorectal cancer diagnoses in younger individuals. Recent ACS research revealed a 50% relative increase in diagnoses in adults aged 45 to 49 from 2021 to 2022.
Dr. Aparna Parikh, medical director of the Center for Young Adult Colorectal Cancer at the Mass General Cancer Center, who is not affiliated with the ACS, shared that experts don’t “entirely understand why” cases are on the rise.
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“But it seems to be an interplay of a person’s risk factors, overall makeup and early exposures,” she previously told Fox News Digital. “[Those] include dietary exposures, environmental exposures and possible antibiotic exposures, as well as lifestyle factors in the right host.”
Changes in bowel habits are the primary red flag that should raise the suspicion of colorectal cancer. (iStock)
Another recent ACS study found that drinking heavily and consistently over an adult’s lifetime could lead to a higher risk of colorectal cancer.
Other known risk factors include family history, obesity, smoking, a diet high in red and processed meats, inflammatory bowel disease, and a personal history or family history of polyps.
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While there may be no symptoms of colorectal cancer before diagnosis, especially in the early stages, certain symptoms should not be overlooked, experts say.
Dr. Eitan Friedman, PhD, an oncologist and founder of The Suzanne Levy-Gertner Oncogenetics Unit at the Sheba Medical Center in Israel, confirmed to Fox News Digital that changes in bowel habits are the primary red flag that should raise the suspicion of colorectal cancer.
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Other symptoms include fatigue as a result of anemia, stomach pain or abdominal discomfort, rectal bleeding or blood in the stool, weakness and unexplained weight loss.
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