Scientists May Have Discovered Why Belly Fat Increases With Age

By Wendy Francis, NBC-HWC
Board-Certified Health & Cognitive Coach

I recently read a fascinating article published by ScienceDaily about research exploring what may trigger increased abdominal fat as we age. I wanted to share it because I think it helps explain something I hear from people all the time:

“I am not doing anything that differently, so why is my waistline changing?”

For years, we have known that aging is associated with changes in body composition. We may lose muscle, gain body fat, and notice that more of that fat settles around the abdominal area.

But scientists have continued asking an important question: Why?

This research may have uncovered one part of the answer.

What Did the Researchers Discover?

The research, published in the journal Science, investigated cells called adipocyte progenitor cells, or APCs.

In simple terms, these are precursor cells found in fat tissue that have the ability to develop into mature fat cells.

Researchers found that as mice aged, certain fat-cell precursor populations became much more active. They also identified an age-associated population of cells called committed preadipocytes, age-specific, or CP-As.

These cells appeared to be particularly good at producing new fat cells.

Researchers also identified signaling through the leukemia inhibitory factor receptor, known as LIFR, as an important part of this age-related fat-cell production process.

Human tissue analysis found cells resembling these age-associated fat-producing cells, and they were more abundant in samples from middle-aged individuals. This suggests that a similar biological process may occur in humans, although much more research is still needed.

Why This Matters

I think this research is important for a couple of reasons.

First, it reminds us that our bodies are not static. Biology changes as we age. Hormones change. Muscle mass can decline. Sleep patterns can change. Activity levels may change. Metabolic health can change. And now researchers are learning more about how the behavior of cells within our fat tissue may also change.

Second, it helps move us away from the oversimplified idea that every change in body composition is simply the result of someone lacking willpower.

Health is more complicated than that.

But I want to be very clear about something else.

This Research Does Not Mean Lifestyle No Longer Matters

Whenever research like this comes out, I worry that people will read the headline and think:

“Well, I am getting older. There is nothing I can do.”

That is not what this research says.

The study helps researchers understand a possible biological mechanism behind age-related abdominal fat accumulation. It does not prove that nutrition, exercise, sleep, stress management, or other lifestyle habits are irrelevant.

In fact, I believe this makes the basics even more important.

As we age, we may need to become more intentional about protecting muscle, supporting metabolic health, staying active, eating nutrient-dense foods, sleeping well, and managing chronic stress.

What Can You Do Right Now?

We cannot stop aging, and at this point we cannot simply switch off the newly identified cells described in this research.

But there are still many areas of health that we can influence.

1. Protect Your Muscle

One of the most important things we can do as we age is work to preserve muscle mass.

Resistance training, regular activity, and adequate protein intake all deserve attention. I encourage my clients to stop thinking about exercise only as a way to burn calories. Exercise is also about maintaining strength, mobility, independence, and metabolic health.

2. Pay Attention to Food Quality

Our bodies need nutrients, not simply fewer calories.

Build meals around quality protein, vegetables, fiber-rich carbohydrates when appropriate, and healthy fats. Reduce the foods that are easy to overeat and offer very little nutritional value, especially highly processed foods that can quickly crowd out more nourishing choices.

3. Stop Ignoring Sleep

Sleep affects appetite regulation, energy, decision-making, recovery, and our ability to stay consistent with healthy habits.

If you are exhausted, everything becomes harder. Cooking becomes harder. Exercising becomes harder. Managing cravings becomes harder. Making good decisions becomes harder.

Sleep is not optional maintenance. It is part of the foundation.

4. Manage Chronic Stress

Stress is part of life. Chronic stress without adequate recovery is another story.

We need periods when the body and brain can come down from constant stimulation. Walking, breathing exercises, quiet time, prayer, journaling, time outdoors, social connection, and healthy boundaries can all become part of a realistic stress-management routine.

5. Look Beyond the Scale

This research is another reminder that body weight alone does not tell us the entire story.

A person can stay close to the same weight while losing muscle and gaining body fat. That is why strength, waist circumference, energy, mobility, laboratory markers, sleep quality, and overall health habits can give us valuable information beyond a single number on the scale.

What Are the Future Possibilities?

This is where the research becomes especially interesting.

By identifying age-associated fat-cell precursor populations and the signaling pathways involved in their activity, researchers may eventually be able to explore therapies that target the biological process contributing to age-related abdominal fat accumulation.

But we are not there yet.

The findings are early and much of the experimental work was performed in mice, with human tissue analysis providing supporting evidence that similar cell populations may exist in people.

Future research will need to determine exactly how these cells behave in living humans, what causes them to emerge, how strongly they contribute to abdominal fat accumulation, and whether targeting them can be done safely and effectively.

This is a promising discovery, but it is not a treatment yet.

My Takeaway as a Health Coach

I love research like this because it reminds us how much we are still learning about the human body.

We are constantly discovering new information about aging, metabolism, sleep, the brain, hormones, muscles, fat tissue, and the way all of these systems communicate with each other.

My takeaway is not that we should wait for a future medication or treatment.

My takeaway is that our bodies change, and our habits need to change with them.

What worked at 25 may not work exactly the same way at 45, 55, 65, or 75.

That does not mean giving up.

It means paying attention, adjusting, staying curious, and continuing to support your body with the things it needs most.

The answer is rarely perfection.
The answer is usually getting back to the basics and doing them consistently.

Sources & Further Reading

ScienceDaily: “Scientists discover what triggers belly fat as we age.” Published June 27, 2026. Source material provided by City of Hope.
Read the ScienceDaily article

Original research: Wang G, Li G, Song A, et al. “Distinct adipose progenitor cells emerging with age drive active adipogenesis.” Science. 2025;388(6745). DOI: 10.1126/science.adj0430.