Does malnutrition always result from food deficiency? justify your answer

No. Anemia and other vitamins deficiency cause it.

fluid balance is an aspect of the homeostasis of organisms in which the amount of water in the organism needs to be controlled, via osmoregulation and behavior, such that the concentrations of electrolytes (salts in solution) in the various body fluids are kept within healthy ranges. the core principle of fluid balance is that the amount of water lost from the body must equal the amount of water taken in.

cutting out negative people, changing their diets, exercising, taking off days from work or school, etc