Answer
A fad diet claims to produce results quickly, which in most cases is unrealistic and for short term only. Such diets are generally not recommended by nutritionists due to their unsustainability.
Work Step by Step
As above
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.