What This Means
This research suggests that certain nutritional supplements can help reduce markers of inflammation in people who are overweight or obese, but the benefits depend on which specific marker is being measured. The study pooled data from 60 clinical trials comparing 14 different supplement types. It found that green tea extract and curcumin (the active compound in turmeric) reduced levels of IL-6, an inflammatory protein. Synbiotics (a combination of probiotics and prebiotics), curcumin, and probiotics taken with omega-3 fatty acids reduced TNF-α, another inflammation marker. CRP, a commonly measured inflammation marker, was lowered by probiotics with omega-3, synbiotics, zinc, and curcumin. Synbiotics also raised adiponectin, a hormone associated with better metabolic health. Notably, none of the supplements significantly reduced leptin, a hormone related to appetite regulation and fat storage.
This research matters because chronic low-grade inflammation associated with excess body weight is linked to conditions like type 2 diabetes and cardiovascular disease. Finding supplements that can safely reduce this inflammation could be a meaningful tool in managing metabolic health. However, the results varied depending on which inflammatory marker was studied, and the researchers noted that differences in supplement dosages, how long people took them, and participant characteristics make it difficult to draw firm conclusions.
The study's authors emphasize that these findings should be interpreted cautiously and that more high-quality clinical trials are needed before strong recommendations can be made. Factors like a person's age, sex, and whether they were also exercising appeared to influence results, which highlights that the effects of these supplements are likely not one-size-fits-all.