Final answer:
Crash diets focus on limiting calories for rapid weight loss but can have adverse health effects and lack long-term sustainability.
Explanation:
Crash diets specifically focus on limiting calories. These diets often promise rapid weight loss but can lead to health complications and are not sustainable in the long term. By severely restricting calorie intake, crash diets can result in short-term weight loss mainly due to water loss rather than fat loss.
Learn more about Crash diets and their focus on limiting calories here:
https://brainly.com/question/36665887
