Junk food, also known as highly palatable foods, is defined as food that is high in calories, often from sugar and fat, and low in essential nutrients like fiber, vitamins, and minerals. These foods are typically high in sodium and often have a savory taste, making them very appealing to consume. Examples include fast food, sugary drinks, processed snacks, and sweets. While occasional consumption might be acceptable, excessive and prolonged consumption can lead to various health issues. 

Here's a more detailed look at junk food:

High in Calories, Sugar, and Fat:

Junk food is often packed with calories, derived primarily from unhealthy fats and added sugars. 

Low in Nutrients:

These foods lack the essential nutrients your body needs, such as protein, fiber, vitamins, and minerals. 

Hyperpalatable:

The combination of fat, sugar, and sodium in junk food creates a highly appealing taste experience, making them easy to overconsume.

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Examples:

Fast Food: Burgers, fries, pizza, etc. 

Sugary Drinks: Soda, energy drinks, sweetened beverages 

Processed Snacks: Potato chips, cookies, candy, etc.

Other: Cakes, pastries, fried foods, processed meats, etc. 

Health Risks:

Excessive consumption of junk food can increase the risk of obesity, type 2 diabetes, heart disease, and other chronic conditions.