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Scientists at the Weizmann Institute have identified a protein called MTCH2 — nicknamed "Mitch" — that acts like a metabolic master switch. Disabling it causes human cells to burn more fat and blocks the formation of new fat cells. The discovery could pave the way for obesity treatments that target how the body uses energy, not just appetite.
Researchers at the Weizmann Institute of Science have uncovered a protein called MTCH2 — or "Mitch" — that plays a powerful role in determining whether cells burn fat or store it. When scientists switched off this protein in human cells, the cells ramped up their consumption of fats, carbohydrates, and amino acids. Even more striking: fat cell formation was nearly halted, with only 5–10% of precursor cells developing into mature fat cells compared to 80–90% in normal conditions.
A follow-up study published in Nature Communications (October 2025) revealed that MTCH2 also regulates how fatty acids enter mitochondria for energy production. When the protein was removed specifically from fat tissue in mice, the animals burned more energy and resisted weight gain on a high-fat diet — without eating less or moving more.
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Why it matters: Current blockbuster weight-loss drugs like semaglutide work mainly by curbing appetite — but they can also chip away at muscle. Targeting MTCH2 could offer a complementary approach that promotes fat burning while preserving lean tissue, though human safety trials are still needed.
