Except and correct me if I'm wrong GMO crops generally have lower % of micronutrients ( vitamins ) then non GMO crops.
The initial purpose was to produce a more nutritious product at a higher yield requiring little to no pesticide via Genetic Modification (GMO`s are also much cheaper as a failed crop will be an expensive crop-the consumer will pay for it). So in fact they will be MORE Nutritious.
Pros
Better Pest and Disease Resistance
Genetic modification of crops can produce varieties that are more resistant to pests and diseases, reducing losses and lessening the dependence on pesticides. For example, a gene that gives resistance to a fungal infection in a wild plant can be inserted into a food plant that lacks this protection. The crop is then less susceptible to this disease.
Improved Stress Tolerance
Genes that give greater tolerance of stress, such as drought, low temperatures or salt in the soil, can also be inserted into crops. This can extend their range and open up new areas for food production.
Faster Growth
Crops can be altered to make them grow faster, so that they can be cultivated and harvested in areas with shorter growing seasons. This again can extend the range of a food crop into new areas or perhaps allow two harvests in areas where only one is currently practical.
More Nutritious Crops
Plants and animals can be engineered to produce larger amounts of essential vitamins and minerals, such as iron, helping to solve nutrition problems in some parts of the world. They can also be altered to change the amounts of protein, carbohydrates, and saturated and unsaturated fats that they contain. This could lead to the production of foods designed specifically for a healthy diet for all consumers.
Production of Medicines and Vaccines by Crops
It may be possible to have plants and animals produce useful medicines and even vaccines, so that prevention and treatment of human diseases in some places can be achieved cheaply and efficiently through the diet.
Resistance to Herbicides
Crops can be modified to be resistant to specific herbicides, making it much easier to control troublesome weeds. Farmers can simply apply the weed killer to a crop field, killing the unwanted plants and leaving the food crop unaffected. For example, GM oilseed rape — the source of canola oil — is resistant to one chemical that's widely used to control weeds.
Better Tasting Foods
Foods can be engineered to taste better, which could encourage people to eat more healthy foods that are currently not popular because of their taste, such as broccoli and spinach. It may be possible to insert genes that produce more or different flavors as well.
