It kind of says something different though. It says the amount remains stable, but they’re dying and replacing themselves. It’s quick in fat people and takes longer in lean people.

It has been generally believed that adult humans cannot create new fat cells. We have thought, until now, that fat cells only and simply increase their fat mass by adding more lipids into fat cells that already exist in order to settle their body weight – this is true, but that is not the end of the story. Research lead by Kirsty Spalding, Jonas Frisén and Peter Arner has recently shown that adult humans constantly produce new fat cells regardless of their body weight status, sex or age.

Peter Arner, Professor, Department of Medicine, Huddinge, said “The total number of fat cells in the body is stable overtime, because the making of new fat cells is counterbalanced by an equally rapid break down of the already existing fat cells due to cell death.”

Edit: I can’t wrap my head around this. Why would anyone keep gaining weight then? If the cells are replaced really quickly, why does it get replaced with the exact same amount of weight? It must be from evolution or something, but it’s weird. That means biome, skin, fat, etc, the stuff that replaces itself quickly, keeps the healthy and unhealthy.