A new weight-loss trend has people drinking a mixture of warm water and unflavored gelatin right before sitting down to a meal.

Promoted by influencers across social media as a budget-friendly appetite suppressant, the practice’s effect has been compared to that of GLP-1 weight-loss medications. Experts, however, urge caution.

There’s a simple biological explanation for why the trick works, according to New Jersey-based dietitian Erin Palinski-Wade.

“Once the gelatin reaches your stomach, the acidic environment helps it form a thicker, semi-gelled mixture that increases the volume and thickness of what’s sitting in your stomach,” she told Fox News Digital.

This physical expansion stretches the stomach wall, she said, sending signals to the brain that you’re starting to get full. Additionally, the protein in the gelatin triggers a gut hormone that helps slow eating.

The result is a temporary increase in fullness that may help some people consume fewer calories in a meal.

While some social media users have branded the hack as “natural Ozempic,” Palinski-Wade said comparing gelatin to prescription semaglutide is a massive exaggeration.

“[It’s] a little like calling a garden hose a fire hydrant,” she said. “There’s a similar idea in the background, but the strength and impact are completely different.”

While gelatin supports a brief, food-triggered hormone response, it does not mimic prescription medications at the receptor level, nor does it possess any hidden fat-burning properties, Palinski-Wade said. It simply fills the stomach to help reduce calorie consumption.

Additionally, relying on gelatin as a dietary staple comes with nutritional risks. While it contains very high amounts of protein, it is not considered a complete source because it lacks the essential amino acid tryptophan, according to the expert.

Using it as a meal replacement can create severe amino acid gaps and fail to support muscle health, Palinski-Wade warned. Instead, it should only be viewed as a pre-meal appetite support tool.

For healthy adults interested in safely trying the method, the nutritionist suggests mixing 1 tablespoon of plain, unflavored gelatin powder in hot water, diluting it with room-temperature water or herbal tea, and drinking it 15 to 30 minutes before a single daily meal.

Anyone who is pregnant, breastfeeding, or managing kidney disease or animal allergies should consult a physician before trying this tactic.

Ultimately, Palinski-Wade added, while gelatin is a low-cost, low-risk habit that can aid in portion control, it is not a magic fix for weight loss.