Breedings crops with higher levels of vitamins and minerals or higher proteins and healthier fats is called:

Bio-fortification refers to the idea of breeding crops to increase their nutritional value. This can be done in two ways, either through conventional selective breeding, or through genetic engineering.

For example, a rice variety, rich in pro-vitamin A, named as 'golden rice' was developed by introducing three genes involved in biosynthetic pathway for carotenoids, the precursor for vitamin A.