Do studies show that soft drinks promote obesity and Type 2 diabetes? It depends on who paid for the study.

Researchers from the University of California, San Francisco, looked at studies of soft drink consumption and its relationship to obesity and diabetes published between 2001 and 2016. They found about 60 studies that were fairly rigorous in their methodology. When the studies were led by independent researchers, they showed a clear link between soda consumption and obesity or metabolic disease. But notably, 26 of the studies reported no link between sugary soft drinks and poor health.

What was different about the studies that found no connection to health problems? They were all carried out by researchers with financial ties to the beverage industry. The findings were published Monday [DOI: 10.7326/L16-0534] [DX] in the Annals of Internal Medicine.