Rigorous scientific study in the nutrition field is extremely hard to do. Most studies rely on self-reported data, and people aren't very reliable in confessin

Rigorous scientific study in the nutrition field is extremely hard to do. Most studies rely on self-reported data, and people aren't very reliable in confessing what they ate and in what quantity. We are also a long-lived species and many effects take decades to manifest. Differences in environment (e.g. water impurities), genetics and gut microbiome confound the issue further.