"营养与食品卫生学" can be translated into English as "Nutrition and Food Hygiene" or, more comprehensively, "Nutrition and Food Sanitation" (though "hygiene" is more commonly used in this context).
Nutrition refers to the study of nutrients and their relationship to health and disease.
Food Hygiene/Sanitation involves the conditions and measures necessary to ensure the safety of food, from production to consumption.
In academic or professional settings, "Nutrition and Food Hygiene" is widely recognized and used to describe this field of study.