Gene transfer puts good fats in mammals

Aiming ultimately to make healthier beef, eggs, and other farm products, scientists have used a worm gene to genetically engineer mice whose tissues are unusually rich in the heart-healthy fats found mainly in fish.

Compared with red meat and poultry, fish such as trout and salmon contain large quantities of omega-3 fatty acids. These are more healthful fats than the omega-6 group, which tends to dominate Western food choices.