dietological
adjective
Pertaining to, derived from, or justified by dietology / the study of nutrition and nutritional regimes; dietologically substantiated.
Examples:
Suitability or unsuitability for certain dietological regimens has been inferred from generally known or publicly published findings in the literature and derived from the usual average nutritional composition. (Source: J∙ Okram - Semolina Dumplings for Soups ● Cooking Recipe.)