Here’s something most of my patients don’t know: when you lose weight, your fat cells don’t go away. They just get smaller, and they’re ready to fill back up the moment your habits slip. That’s a big reason so many people regain weight after a diet or after stopping a GLP-1 medication. Now researchers are testing an experimental injection called CBL-514 that does something different. Instead of shrinking fat cells, it tells them to die. Early trials suggest it can also reduce visceral fat, the deep belly fat linked to diabetes and heart disease.
Shrinking Fat vs. Destroying It
When you lose weight, you don’t lose fat cells. You shrink them. Each fat cell releases some of its stored fat and gets smaller, but the cell stays where it is. That’s a big reason weight comes back so easily. Your body still has the same number of fat cells, and they’re ready to fill up again as soon as you eat more than you burn.
Diet, exercise, and even the newer weight-loss injections all work this way. They empty fat cells. They don’t get rid of them.
CBL-514 does something else. It’s an experimental injection that triggers apoptosis in fat cells. Apoptosis is programmed cell death, the same controlled process your body uses every day to clear out old or damaged cells. So instead of making fat cells smaller, the drug tells a portion of them to break down and die. Once a cell is gone, it can’t refill.
The drug was first developed to remove lipomas, the soft, harmless fatty lumps some people get under the skin. From there, researchers tested whether it could reduce ordinary body fat. In two phase 2 clinical trials with 107 and 173 participants, CBL-514 injections reduced subcutaneous fat in the abdomen for most volunteers. That’s the fat just under the skin, the kind you can pinch. Those results were published in the Aesthetic Surgery Journal in 2025.
Losing pinchable belly fat is mostly a cosmetic win. The bigger question was whether the drug could also reach the fat that does real damage to your health. That’s what the newest data looks at.
Going After the Fat That Harms Your Health
There are two main types of belly fat. Subcutaneous fat sits just under your skin. It’s the soft layer you can pinch. Visceral fat sits deeper, packed around your organs. That’s the one to worry about. It causes inflammation and raises your risk of type 2 diabetes and heart disease. Even people at a normal weight can carry too much of it.
In October 2026, researchers presented new data at a major diabetes conference in Milan. They looked at MRI scans from 41 people in the earlier trials to see whether CBL-514 also reduced visceral fat. Participants got either the drug or a placebo injected into the lower belly every three weeks for up to 12 weeks.
The results were encouraging. After four weeks, the drug group had about 12% less visceral fat. The placebo group had about 6% more. By the end of the treatment period, the drug group was still down about a quarter cup of visceral fat, while the placebo group had gained more.
Keep in mind that the study measured fat, not health outcomes. Timothy Garvey, the endocrinologist who led the trial, expects patients to notice a flatter stomach. But he points out that the health payoff comes from overall weight loss, less visceral fat, and better blood pressure and cholesterol. We don’t know yet whether this drug delivers those.
A Possible Partner for GLP-1 Drugs
GLP-1 medications like semaglutide (Ozempic, Wegovy) and tirzepatide (Mounjaro, Zepbound) have changed how we treat obesity. But they come with a well-known catch. When patients stop taking them, most regain a large share of the weight they lost. I see this often. The appetite comes back, and the fat cells that shrank during treatment fill up again.
That’s where CBL-514 could help. GLP-1 drugs shrink fat cells. CBL-514 removes some of them. In theory, fewer fat cells means less room for the weight to come back.
The researchers tested this idea in rats. One group got tirzepatide alone. Another got tirzepatide plus CBL-514. The rats on both drugs lost more weight. After tirzepatide was stopped, they also regained less weight than the rats that had taken tirzepatide alone.
This is promising, but it’s still only animal data. Rats are not people, and many treatments that work in animals don’t hold up in human trials. No one has tested this combination in humans yet. For now, it’s a reasonable idea that needs proof.
Before You Get Too Excited
These results are early, and there are a few things to keep in mind before getting excited.
The study is small and hasn’t been peer-reviewed. The visceral fat findings come from just 41 people. They were shared at a conference and in company announcements, not in a published journal where other scientists have checked the methods and data.
We don’t know if the fat stays off. Participants were followed for only a few months. Marie Spreckley, an epidemiologist at the University of Cambridge who wasn’t involved in the research, calls the results encouraging but says we need larger, longer trials to see whether the fat loss lasts and actually improves health.
The extra fat may go somewhere else. This is the safety question I’d want answered first. Fat cells are where your body is supposed to store extra energy. If some of them are gone and you keep eating more than you burn, that fat has to go somewhere. It could end up in places it shouldn’t be, like your liver or muscles, where it does more harm. Justin Rochford, a metabolism researcher at the University of Aberdeen, says the researchers need to show this doesn’t happen and that the drug doesn’t worsen blood sugar or blood fat levels.
Safety data is limited. The reports so far don’t give a clear picture of side effects or long-term risks.
Larger trials with more participants and longer follow-up are now underway. Until those results are in, CBL-514 isn’t an option for patients. It’s also unlikely to replace the basics. Even if it works, you’ll still need good eating habits and regular activity to keep the fat cells you have from filling up again.
My Personal RX on Losing Visceral Fat and Keeping It Off
CBL-514 is still years away from your doctor’s office, if it gets there at all. The good news is that you don’t need an experimental injection to start shrinking visceral fat. It tends to respond to lifestyle changes faster than the fat under your skin. In my practice, I’ve seen patients lower their waist size and improve their blood sugar and cholesterol within a few months of making steady changes.
The harder part is keeping it off. Your fat cells don’t go anywhere when you lose weight, so the goal is to build habits that keep them from refilling. Here are my personal tips to help you do both.
- Measure Your Waist, Not Just Your Weight: The scale can’t tell you where your fat is. Measure around your belly at the level of your navel. A waist over 40 inches for men or 35 inches for women is a sign you may be carrying too much visceral fat. Check it once a month to track your progress.
- Cut Back on Sugary Drinks and Refined Carbs: Soda, sweetened coffee drinks, white bread, and pastries spike your blood sugar and insulin. Over time, this pushes your body to store more fat around your organs. Swapping just your daily sugary drink for water or unsweetened tea is a strong place to start.
- Fill Up on Fiber: Soluble fiber from oats, beans, lentils, apples, and flaxseed slows digestion and keeps you full longer. It also feeds the healthy bacteria in your gut, which play a role in how your body stores fat. Aim to include a fiber-rich food at every meal.
- Protect Your Muscle While You Lose Fat: When you eat less, your body can burn muscle along with fat. Losing muscle slows your metabolism and makes regain more likely. Include a good source of protein at each meal. If cravings and low energy keep getting in your way, my Weight Loss Bundle supports a healthy metabolism, helps reduce cravings, and helps preserve lean muscle. It also includes my Slim Gut Cookbook and Ultimate Fat Burning Guide to help you plan meals.
- Get Moving Every Day: Aerobic activity like brisk walking, cycling, or swimming is one of the most effective ways to burn visceral fat. Aim for at least 150 minutes a week. You don’t need to do it all at once. Three 10-minute walks a day count.
- Add Strength Training: Lifting weights or doing bodyweight exercises two to three times a week builds muscle. More muscle means your body burns more energy at rest and handles blood sugar better, which makes it harder for fat to build back up.
- Make Sleep a Priority: Poor sleep raises your stress hormones and increases hunger, both of which drive belly fat. Aim for seven to nine hours a night. If you have trouble winding down, Sleep Max combines magnesium, GABA, 5-HTP, and taurine to help calm your mind and support restful sleep.
- Keep Stress in Check: Chronic stress keeps cortisol high, and cortisol tells your body to store fat around your midsection. Find a daily habit that helps you decompress, such as deep breathing, a short walk outside, or time with people you enjoy.
- Limit Alcohol: Alcohol adds calories with no nutrition, and your liver processes it before anything else. Regular drinking is closely tied to fat buildup around the abdomen and in the liver. If you drink, keep it to one drink a day or less.
- Think Long-Term, Not Quick Fixes: Whether you’re using a GLP-1 medication or doing it on your own, lasting results come from habits you can keep for life. My Protocol For Optimizing Your Health & Wellbeing lays out a whole-body approach to nutrition, movement, sleep, and stress so you can keep the weight off after the initial loss.
Sources:
- Saey, T. H. (2026, October 8). An experimental drug kills fat cells, rather than shrinking them. Science News. https://www.sciencenews.org/article/experimental-drug-kills-fat-cells
- Nield, D. (2026, October 18). A new injection makes fat cells self-destruct, and might prevent GLP-1 weight regain. ScienceAlert. https://www.sciencealert.com/a-new-injection-makes-fat-cells-self-destruct-and-might-prevent-glp-1-weight-regain
