Cancer-fighting pink pineapples, heart-healthy purple tomatoes and lighter vegetable oils - all genetically engineered - may someday be on US grocery shelves alongside more traditional products.

These foods could receive government approval in the coming years, following the OK given recently to apples that don't brown and potatoes that don't bruise.

The companies and scientists that have created the foods are hoping customers will be attracted to the health benefits and convenience and overlook any concerns about genetic engineering.