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It is a general rule, that the stronger each kind is, so much the less easily it is concocted; but when once concocted, it nourishes more. Wherefore the nature of the food must be determined by the degree of one’s strength; and the quantity proportioned to the kind. Upon this account weak men must make use of the weakest things; a middle kind best supports those, that are moderately strong; and the most substantial is fittest for the robust. Lastly, A person may take a greater quantity of what is lighter: but in what is most substantial, he ought to moderate his appetite.

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And these above-mentioned are not the only distinctions; but some things afford good juices, others bad, which two kinds the Greeks term euchyma and cacochyma[AY]; some are mild, others acrid; some generate in us a thicker phlegm, others a more fluid; some agree with the stomach, others not; likewise some produce flatulencies, others have not that property; some heat, others cool; some readily turn sour in the stomach, others are not easily corrupted there; some open the belly, others bind it; some promote urine, others retard it; some are soporiferous, others excite the senses. Now all these must be known for this reason, that different things are proper in different constitutions or states of health.