Junk food is a term used to describe food that is high in calories from sugar and/or fat, and possibly sodium, but with little dietary fiber, protein, vitamins, minerals, or other important forms of nutritional value. Junk food is also known as "discretionary food" or "optional food". Some examples of junk food include cakes, biscuits, fast foods (such as hot chips, burgers, and pizzas), chocolate, sweets, processed meat (such as bacon), and snacks (such as chips) . However, precise definitions of junk food vary by purpose and over time, and some high-protein foods, like meat prepared with saturated fat, may also be considered junk food.

Junk food provides empty calories, supplying little or none of the protein, vitamins, or minerals required for a nutritious diet. Most junk food is highly processed food, which means it usually contains artificial flavorings and additives and is packaged in boxes, cans, or bags. Junk food is low in satiation value, which means people dont tend to feel as full when they eat them, leading to overeating. Junk food also tends to replace other, more nutritious foods, and when people consume junk food, they are usually not getting plenty of low-fat dairy or other healthful beverages like green tea or orange juice.

Its important to note that some foods, such as hamburgers and tacos, can be considered either healthy or junk food, depending on their ingredients and preparation methods. Products known as "health foods," such as some fruit juices and muesli bars, can actually be junk food if they contain high levels of sugar, salt, or fat. Therefore, its essential to read nutritional information labels and follow the Health Star Rating system to determine how healthy a product is.

In conclusion, junk food is food that contains high levels of fats, salt, or sugar and lacks nutrients such as fiber, vitamins, and minerals. Junk food provides empty calories, and its consumption can lead to overeating and replace other, more nutritious foods. Its important to eat a well-balanced diet full of the nutrients the body needs to stay healthy.