diet
This word carries a dual identity depending on the context of restriction. In a biological sense, it is a neutral description of nutritional intake, devoid of judgment or effort. It simply describes what fuels a living organism. In a social or medical sense, it shifts toward a feeling of discipline, deprivation, or a goal-oriented struggle. It often implies a conscious decision to avoid certain foods, evoking a sense of willpower or medical necessity rather than natural habit.
Countable when referring to a specific weight-loss plan (I tried a keto diet). Uncountable when referring to the general nutritional regime of a species (The whale's diet is plankton).
Meanings
The kinds of food that a person, animal, or community habitually eats.
"The pandas have a diet consisting mostly of bamboo."
A special course of food to which a person limits themselves, typically to lose weight or for health reasons.
"She started a strict diet to lower her cholesterol."