diets
n. countablen. the kinds of food that a person, animal, or community usually eats. It can also mean a special plan where you eat less or different food to lose weight or stay healthy.
n. the kinds of food habitually consumed by a person or animal. Also refers to a restricted or specific regimen of food intake for medical or weight-loss purposes.
Many people try different diets to improve their health.
The doctor recommended low-sugar diets for patients who are at risk of developing diabetes.
While traditional Mediterranean diets are high in healthy fats, modern urban eating habits have shifted toward processed foods with higher caloric density.
Commonly used in the plural when discussing various types of nutrition or comparing different groups.
I am on dietI am on a dietWhen referring to a specific weight-loss plan, the noun is countable and requires an article.