Below 150 mg/dL, According to Dr. Caldwell Esselstyn
“Based on the groundbreaking results of his 20-year nutritional study—the longest study of its kind ever conducted—this book explains, with irrefutable scientific evidence, how we can end the heart disease epidemic in this country forever by changing what we eat. Here, Dr. Esselstyn convincingly argues that a plant-based, oil-free diet can not only prevent and stop the progression of heart disease, but also reverse its effects.” http://www.heartattackproof.com/
Heart attack is virtually nonexistent in populations whose heavily plant-based diet keeps the average person’s total cholesterol below 150 mg/dL.