If you saute spinach before cook it will still have nutritional value?

Yes. Sauteing spinach before cooking will still retain most of its nutritional value. While some nutrients may be lost during the cooking process, sauteing spinach can actually help to increase the bioavailability of certain nutrients, such as iron and vitamin A. Additionally, sauteing spinach can help to reduce the amount of oxalic acid, which can interfere with the absorption of iron.