Dietary (adjective)

1. Relating to or affecting the diet or food that a person or animal eats.
2. Relating to or concerned with the science of nutrition.

Origin:

Late 16th century: from french diététique, from latin dieteticus, from greek diaitētikos, from diaitas, diaitē "a way of life".

Examples:

1. The doctor recommended a dietary change for her high cholesterol.
2. She was advised to follow a strict dietary regimen.
3. The dietary requirements of the athlete were carefully monitored.
4. The dietary supplements promised to help her lose weight.
5. The study focused on the dietary habits of the population.