Macro partitioning

Higher dietary intake of polyunsaturated fatty acids (PUFAs) is associated with a lower risk of heart disease mortality in adults without prior myocardial infarction, whereas saturated (SFAs) and monounsaturated fatty acids (MUFAs) show no such association.

For heart health prevention, focus on increasing polyunsaturated fats (found in fish, nuts, seeds, and vegetable oils) rather than just cutting saturated fats. This benefit appears strongest for people who have not yet had a heart attack. If you have existing heart disease, dietary changes alone may not be sufficient to reduce mortality risk, and medical management is critical.