I think there is a little more to it besides just vit d and magnesium. the plants grown well and plants grown poorly can be so different it's almost unbelievable. some foods with really high brix content dont even spoil. they often just dry out as they go "bad"... then there are the beneficial enseymes and terpenes and flavors that are lacking in poorly grown plants.... the walmart oranges are not even worth eating imo...