It depends on your body needs, and what your goals are, to build muscles for example or to decrease your cholesterol or weight or increase stability of your energy levels so it varies greatly imo and its better to consult a nutritionist before putting a limit for yourself. personally I'd say between 20-30
All of the other choices have to do with chemicals, cancer or some other form of science, but Crustacea is a type of sea anthropod that has nothing to do with cancer.
