They were known to be very, very good for you. Ancient people kept their intestinal tract very healthy by combining the two in their diets. They also had none of the biocidal agents we do in their food.
It doesn't take much to stay pretty healthy but the modern world has managed to turn it into the labors of Hercules somehow. People used to eat stuff that was very good for them before scienmagists recommended all the opposite foods and generally made the whole world so sick they then became the customers of doctors who then proceeded to really screw them up. Ultimately, it is always about making more money, no matter who gets ill.
A good rule of thumb to follow in life is to keep in mind that the majority of all people who claim altruism as a motive are usually motivated by the very opposite.