※ 引述《punta (JUST NONSENSE)》之铭言：
: nutritional,nutrition,nutritious,nutrient
: 这四个搞不清楚了…
Nutrition is the process itself.
"Nutrition is very important for a growing child."
Nutrients are the particular substances necessary for nutrition.
"This cereal is jam-packed with nutrients!"
Nutritious is usually used to describe something which contains nutrients.
A common marketing term is "Part of a nutritious breakfast"
Nutritrional generally implies a scientific aspect relating to the process of
nutrition. Otherwise, its meaning overlaps with "nutritious," and is less used
in general.