In people with obesity, larger fat cells in the subcutaneous layer are more closely linked to insulin resistance in fat tissue than the presence of immune cells, aging cells, or inflammatory...

In people with obesity, the link between inflammation in fat tissue and insulin resistance is explained by the size of fat cells; when researchers account for fat cell size, the connection between inflammation and insulin resistance no longer remains.

In humans, larger fat cells in the abdomen and thighs are linked to reduced effectiveness of insulin in stopping fat breakdown, which is measured by a specific marker called IC50.

When obese adults lose 10% of their body weight, their fat tissue becomes more responsive to insulin, with a 26% improvement in a key measure of insulin resistance, even though levels of immune cells, damaged cells, and inflammatory signals in fat tissue remain unchanged.

After losing weight, fat tissue becomes more responsive to insulin without changes in the number of immune cells or inflammatory signals. In some cases, higher levels of inflammation markers are linked to lower insulin resistance, suggesting immune cells may play a supportive role in tissue adaptation.

When fat cells get too big, they don't work well and the body tries to stop them from growing further to avoid damage and swelling.