Harvard T.H. Chan School of Public Health

New Capabilities

As of May 2026: Primary research institution for this study

For seven decades, nutrition scientists have debated whether to cut carbs or fat for a healthy heart. A new Harvard study of nearly 200,000 Americans over 30 years found that both approaches work equally well. What matters is choosing whole grains, vegetables, and plant proteins over processed foods and red meat.

Updated May 29