Kuala Lampur, Jan. 6 -- Remember when butter was public enemy number one and margarine reigned supreme? For decades, the nutritional orthodoxy preached a simple gospel: saturated fats were the highway to heart disease, while polyunsaturated fats - primarily from industrially processed seed oils like soybean, corn, canola, and sunflower - were the path to salvation. Grocery aisles groaned under "low-fat," "heart-healthy" labels featuring these very oils. Now, a nutritional counter-revolution is in full swing across the US, turning this dogma on its head. Seed oils are suddenly the bad guys, blamed for inflammation, chronic disease, and metabolic mayhem. What happened?

The shift isn't happening in a vacuum. It's the culmination of several ...