Answer :

Final answer:

A fad diet is characterized by short-lived trends that promise quick weight loss but lack sustainability and balanced nutrition.


Explanation:

A fad diet is best described as short-lived because it often promises rapid weight loss, restricts certain foods, and is not sustainable for long-term health. These diets usually do not focus on overall balanced nutrition and can lead to health issues due to overconsumption of certain nutrients or rapid weight loss.


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