Weight management is often treated as a “middle-age” problem, but new research suggests that the pounds you pack on in your 20s may be the most dangerous of your life.

A massive study of more than 620,000 individuals found that the damage from early weight gain is disproportionately high and surprisingly permanent. According to the findings, the younger someone is when obesity sets in, the higher the risk of early mortality.

The study, published in the journal eClinicalMedicine, analyzed data from the Obesity and Disease Development Sweden project.

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“The most consistent finding is that weight gain at a younger age is linked to a higher risk of premature death later in life, compared with people who gain less weight,” Tanja Stocks, a professor at Lund University and one of the researchers behind the study, said in a press release.

Developing obesity between the ages of 17 and 29 was linked to a 70% higher risk of early death compared to weight gain later in life.

Weight gain later in adulthood, between ages 30 and 60, was also linked to higher death rates, but the connections were generally weaker.

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“One possible explanation for why people with early obesity onset are at greater risk is their longer period exposed to the biological effects of excess weight,” Huyen Le, a doctoral student at Lund University and first author of the study, said in the release.

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When weight gain happens in the 20s, the blood vessels, liver and metabolic systems endure obesity-related strain for decades longer than someone who gains the same weight in their 50s, experts say.

The study identified type 2 diabetes as the leading cause of death associated with early-onset obesity. Other significant risks included high-blood pressure, liver cancer in men and uterine cancer in women.

To reach these conclusions, researchers tracked participants’ weight paths across adulthood over more than 50 years, focusing on three specific windows: ages 17 to 29, 30 to 44, and 45 to 60.

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Using a body mass index (BMI) of 30 or higher to define obesity, the team compared weight data against Sweden’s national death registry.

After adjusting for a variety of factors, including smoking habits and marital status, the trend showed that becoming obese later in life still carried risks, but the danger compounded the longer people stayed obese.

While these findings highlight the “importance of early and sustained obesity prevention strategies,” the researchers noted that other factors come into play, and that increases in risk within a population can be difficult to interpret.

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“We shouldn’t get too hung up on exact risk figures,” Stocks said.

“They are rarely entirely accurate, as they are influenced, for example, by the factors taken into account in the study and the accuracy with which both risk factors and outcomes have been measured.”

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Because the study was conducted in Sweden, more research is needed to understand the effect of early-onset obesity in other populations, the team noted.

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In a sweeping analysis of more than 400,000 Reddit posts, researchers have revealed some little-known GLP-1 side effects.

GLP-1 receptor agonists — such as semaglutide (Ozempic and Wegovy), and tirzepatide (Mounjaro and Zepbound) — have been most commonly associated with gastrointestinal side effects, such as nausea, vomiting, diarrhea and constipation.

A new study published in Nature Health, however, uncovered some overlooked effects.

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University of Pennsylvania researchers used artificial intelligence to analyze more than five years of Reddit posts from more than 67,000 people taking the popular drugs for diabetes or weight loss.

While clinical trials are still the “gold standard,” the researchers noted that Reddit community feedback reflects a different population.

“People often use medications differently than they’re prescribed, so it’s also important to look at real-world usage, which can diverge from usage in a clinical trial,” lead researcher Neil Sehgal, a PhD student at the University of Pennsylvania, told Fox News Digital. “So there are many possible reasons we’re seeing signals that the trials may have missed.”

Overlooked effects

Nearly half of the users reported one or more side effects. The most common were nausea, vomiting and constipation, which aligned with what clinical trials found, according to Sehgal.

“We’re almost certainly capturing a skewed slice of the full picture.”

“We did notice a few side effects that have not previously been reported for these drugs,” he told Fox News Digital. 

“For example, about 4% of users who described side effects reported menstrual irregularities. Other Redditors described unusual temperature-related symptoms, like chills or hot flashes.”

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Nearly 13% of users also experienced psychiatric symptoms, such as anxiety, depression and insomnia. More than 5% also complained of abdominal pain, acid reflux, headache and dizziness.

“Fatigue was also the second most commonly reported symptom overall, but has met relatively few reporting thresholds in existing trials,” Seghal noted. “This gap between what patients are self-reporting online and what gets captured in trials is really what motivated this whole line of work.”

Clinical context

Dr. Sue Decotiis, a New York City-based board-certified weight-loss physician, noted that many of the reported symptoms, such as disorientation and fatigue, are most likely due to dehydration and hypoglycemia (low blood sugar).

“Patients should be carefully monitored using a structured protocol that ensures proper nutrition and adequate hydration, ideally under the direct supervision of a physician experienced in metabolism and weight loss,” Decotiis, who was not involved in the study, told Fox News Digital. 

“Additionally, body composition analysis can help identify issues such as muscle loss, excessive water loss or insufficient fat loss.”

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A significant concern, according to the doctor, is that many individuals are accessing these medications through online platforms or without receiving appropriate medical care. 

“In my experience treating thousands of patients with various GLP-1 medications, complications are rare and typically occur only when patients are noncompliant,” she added.

Study limitations

As the data came from Reddit users, who tend to be younger, primarily male and mostly based in the U.S., it may not represent everyone taking these medications, the researchers noted.

“And even within Reddit, the people who post about their side effects are probably not typical of everyone on the medication,” Sehgal said. “If you had a good experience, you’re less likely to be writing about it online. So we’re almost certainly capturing a skewed slice of the full picture.”

The researchers also noted that the study can’t prove the drug caused the reported symptoms.

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“To be clear, we can’t say for certain whether these drugs are causing menstrual irregularities,” Sehgal said. “Patients on Reddit aren’t going to self-report every symptom they have, and they may also report things that aren’t actually linked to the medications. So it’s important to treat this as hypothesis-generating signals and do more research.”

The study also didn’t include GLP-1 dosage, duration of the medication and symptoms, or other health conditions the users experienced. There is also the chance that the AI tools misunderstood meanings or context, the researchers noted.

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The results must be confirmed with more rigorous research, Sehgal said. “That’s how we’ll get real answers about prevalence and causality, which social media data alone can’t provide.” 

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“These are signals, not conclusions – but I do think it’s always worth talking to your doctor about anything unexpected you’re experiencing while on a new medication, even if you’re not sure if it’s related,” he advised. “So if something feels off, say something.”