Scientists found a small protein that can switch on brown fat. The protein helps the tissue build the tiny blood vessels and nerves it needs to create heat.
What Is Brown Fat?
Most of the fat in our bodies is white fat. It stores extra calories and can lead to weight gain. Brown fat is different. It is found in smaller amounts and helps keep us warm by turning calories into heat, especially when we feel cold.
To work, brown fat needs a lot of nerves and blood vessels. Nerves carry signals from the brain that tell the tissue to start heating. Blood vessels bring oxygen and nutrients so the heat can be made and spread through the body.
The Protein That Builds the Network
Earlier work showed that brown fat cells release a protein called SLIT3. This protein breaks into two pieces after it is made. Researchers discovered that an enzyme named BMP1 cuts SLIT3 into these two parts.
One piece helps blood vessels grow, while the other piece supports the growth of nerves. A receptor called PLXNA1 catches one of the pieces and guides nerve development. Mice that lack SLIT3 or PLXNA1 get very cold easily because their brown fat lacks enough nerves and blood vessels.
Why It Matters for People with Obesity
The team looked at fat samples from more than 15,000 people, including many with obesity. They saw that the gene that makes SLIT3 is linked to inflammation and how the body handles sugar. This suggests the protein may affect how healthy brown fat is in people who are overweight.
A New Way to Think About Weight Loss
Most medicines for weight loss tell the brain to eat less. This new research points to a different idea: boost the body’s own calorie‑burning engine by improving brown fat’s infrastructure.
In short, having brown fat is not enough. The tissue also needs the right network of nerves and blood vessels to turn calories into heat effectively.