Final answer:
Fad diets are popular but not based on sound science. Examples include Atkins, cabbage soup, and grapefruit diets.
Step-by-step explanation:
Fad diets are ways of eating that become popular to follow but aren't based on sound science. These diets often promise quick weight loss or other health benefits, but they may not provide the necessary nutrients and can be unsustainable in the long term. Examples of fad diets include the Atkins diet, the cabbage soup diet, and the grapefruit diet. It's important to consult with a healthcare professional or registered dietitian before starting any diet plan.
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