What is the primary concept expressed by the phrase “One man's meat is another man's poison”?

The phrase "One man's meat is another man's poison" primarily highlights the concept of individual variability in nutrition. This expression illustrates that what may be beneficial or nourishing for one person could potentially be harmful or intolerable for another. This variability can arise from differences in genetics, health conditions, age, lifestyle, and personal preferences.

For instance, certain foods might provide nutrients and energy for one individual while triggering allergies or intolerances in another. This reflects the necessity of personalized approaches to nutrition, as individuals have unique dietary needs and responses to different foods. Understanding this concept is crucial for nutrition coaching, as a one-size-fits-all approach to diet may not suit everyone and could lead to adverse effects for some individuals.

The other options, while relevant in their own contexts, do not encapsulate the broader message conveyed by the phrase as effectively. Dietary preferences are part of individual variability, but they do not encompass the full range of nutritional responses. Food allergies are a specific example of the variability but do not represent the entire spectrum of individual differences in nutritional needs. Universal food effects suggest a uniform response to food, which runs counter to the idea of individual variability.