People who eat a diet high in red meat have triple the levels of a gut-generated chemical linked to heart disease, trimethylamine N-oxide (TMAO), of those who eat mostly white meat or plant-based proteins, says a new study in the European Heart Journal. Saturated fat and cholesterol are often the focus of red meat’s impact on the heart, but studies show thatTMAO may also play a role. “Our prior research showed that blood levels ofTMAO predict future risks of heart attack, stroke, and death,” says Stanley Hazen, M.D., study author and chair of the department of cardiovascular and metabolic sciences at Cleveland Clinic.TMAO levels can be detected through a simple blood test, so researchers say these findings may help doctors discover new strategies to prevent or treat heart disease. But…