Inflammation linked to excess body fat, marked by specific tissue structures and higher levels of certain proteins in breast tissue, is associated with a higher likelihood of developing cancer, even...

We’ve found so far that inflammation tied to excess body fat — even in people with a normal BMI — may be linked to a higher chance of developing cancer. This connection was observed through specific tissue changes and elevated levels of certain proteins in breast tissue, suggesting that fat-related inflammation doesn’t only affect those who are overweight [1]. The evidence we’ve reviewed includes one detailed assertion that highlights how biological markers of inflammation, such as immune cell clusters and signaling proteins, were present in breast tissue of individuals with normal body weight and correlated with increased cancer likelihood. No studies in our analysis contradicted this pattern. While this doesn’t mean everyone with normal BMI and inflammation will develop cancer, it does suggest that body fat distribution and its inflammatory effects might play a role beyond what weight alone shows. We don’t yet know how common this is, or whether reducing inflammation would change outcomes, because the evidence is limited to a single assertion. More research would be needed to understand how widespread this link is, or if it applies to other types of cancer. For now, this suggests that even people who appear to be at a healthy weight might still carry hidden metabolic risks tied to fat tissue. Paying attention to overall health — like diet, movement, and sleep — could help manage inflammation, regardless of what the scale says.