The word "nutrition" is an uncountable noun, so it does not have a plural form. It refers to the process of obtaining the food necessary for health and growth. Therefore, you would use "nutrition" in both singular and plural contexts without changing the word.
heterotrophic nutrition
dinutrition
it is heterotrophic nutrition
periphral parental nutrition total parenteral nutrition
saprotophic nutrition is the nutrition of organisms which feed on dead animals
the nutrition is grass and water
the nutrition of a meal
Gordon M. Wardlaw has written: 'Contemporary Nutrition Package' 'Contemporary nutrition' -- subject(s): Textbooks, Nutrition 'Wardlaw's perspectives in nutrition' -- subject(s): Nutrition, Energy Metabolism, Nutritional Physiological Phenomena, Micronutrients, Diet 'Contemporary Nutrition' -- subject(s): Nutrition 'MP' 'CONTEMPORARY NUTRITION-W/MYPYRAMID+CD' 'Contemporary Nutrition, 6/e + Dietary Guidelines Card' 'Contemporary nutrition' -- subject(s): Textbooks, Nutrition
Autotrophic nutrition
The mode of nutrition for the Venus Flytrap is Heterotrophic Nutrition.
Good nutrition keeps you healthy. Nutrition is absorbed by your digestive system.
Probably Nutrition, or nutritional studies.