Most studies lump red meat together with processed meat products, but when treated as separate food categories, the negative associations with red meat tend to disappear. That said, red meat clearly promotes inflammation, which is necessary for things like building muscle. Optimal health results from the right balance of inflammation, not its minimization. The authors focus no anti-inflammatory foods because most Americans are imbalanced toward inflammatory processed foods. It's very individual though - allergies, autoimmune responses and other inflammatory cascades are complex; I get debilitating inflammation from tomatoes.