But it's best to eat them on the same day, not overnight. Although the tomato scrambled eggs overnight, but if the eggs are fully cooked, and in a low temperature, sealed storage, generally can be preserved for 24-48 hours will not deteriorate, so the tomato scrambled eggs overnight can be eaten.
After sufficient heating is edible, there is no effect on health. However, the food has been heated many times, its nutritional value will have a certain loss, for the higher nutritional needs of the population, especially the elderly, children, etc., if often eaten will also lead to malnutrition.