Obesity is a big health problem around the world. It can lead to diabetes, heart disease, and other health issues. One reason people gain weight is the easy access to high‑fat foods in stores.
Even though we think hunger starts in the stomach, the brain actually controls how much we eat. Scientists are still learning how fat in our diet talks to the brain’s hunger centers.
Brain Protein That Controls Appetite
Researchers at Osaka Metropolitan University studied a brain protein called OPA1. This protein lives in special hypothalamus cells that help regulate energy use.
They used two groups of mice: normal mice and mice where OPA1 was removed only from those hypothalamus cells. Both groups could eat soybean oil whenever they wanted.
Different Effects in Males and Females
In male mice, eating soybean oil raised OPA1 levels. Female mice did not show this increase. Mice without OPA1 ate more, got heavier, and eventually became obese.
When given a choice between regular food and soybean oil, OPA1‑deficient mice chose more oil and gained extra weight, especially the females.
How an Obesity Drug Worked Differently
The scientists also tested an anti‑obesity drug called setmelanotide. It lowered appetite in normal male mice and in OPA1‑deficient male mice.
However, the drug was much less effective in OPA1‑deficient female mice.
These findings suggest that the brain’s energy system, and the protein OPA1, play a big role in obesity. They also show that males and females may need different treatment approaches.
The study was published in the FASEB Journal.