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“Junk food” is a term used to describe food that is high in calories from sugar and/or fat, and possibly sodium, making it hyperpalatable, but with little dietary fiber, protein, vitamins, minerals, or other important forms of nutritional value. It is also known as HFSS food (high in fat, salt and sugar). The term junk food is a pejorative dating back to the 1950s. Many different kinds of junk food can be easily found in most supermarkets and fast food restaurants. Because of such easy access to it, people are most likely to consume it. 

Precise definitions vary by purpose and over time. Some high-protein foods, like meat prepared with saturated fat, may be considered junk food. Fast food and Fast food restaurant are often equated with junk food, although fast foods cannot be categorically described as junk food. Most junk food is ultra-processed food.

Concerns about the negative health effects resulting from a junk food-heavy diet, especially obesity, have resulted in public health awareness campaigns, and restrictions on advertising and sale in several countries. Current studies indicate that a diet high in junk food can increase the risk of depression, digestive issues, heart disease and stroke, type 2 diabetes, cancer, and early death.

When junk food is consumed very often, the excess fat, simple carbohydrates, and processed sugar found in junk food contribute to an increased risk of obesity, cardiovascular disease, and many other chronic health conditions. A case study on the consumption of fast foods in Ghana suggested a direct correlation between consumption of junk food and obesity rates. The report asserts that obesity resulted in related complex health concerns such as an upsurge in the rate of heart attacks. Studies reveal that as early as the age of 30, arteries could begin clogging and lay the groundwork for future heart attacks. Consumers also tend to eat too much in one sitting, and those who have satisfied their appetite with junk food are less likely to eat healthy foods like fruit or vegetables.

Testing on rats has indicated negative effects of junk food that may manifest likewise in people. A Scripps Research Institute study in 2008 suggested that junk food consumption alters brain activity in a manner similar to addictive drugs like cocaine and heroin. After many weeks with unlimited access to junk food, the pleasure centers of rat brains became desensitized, requiring more food for pleasure; after the junk food was taken away and replaced with a healthy diet, the rats starved for two weeks instead of eating nutritious fare. A 2007 study in the British Journal of Nutrition found that female rats who eat junk food during pregnancy increased the likelihood of unhealthy eating habits in their offspring.

Other research has been done on the impact of sugary foods on human emotional health and has suggested that consuming junk food can negatively impact energy levels and emotional well-being.

In a study published in the European Journal of Clinical Nutrition, the frequency of consumption of 57 foods/drinks of 4,000 children at the age of four and a half were collected by maternal report. At age seven, the 4,000 children were given the Strengths and Difficulties Questionnaire (SDQ), with five scales: hyperactivity, conduct problems, peer problems, emotional symptoms, and pro-social behavior. A one standard deviation increase in junk food was then linked to excessive hyperactivity in 33% of the subjects, leading to the conclusion that children consuming excess junk food at the age of seven are more likely to be in the top third of the hyperactivity scale. There was no significant correlation between junk food and the other scales.

Several countries have taken, or are considering, various forms of legislative action to curb junk food consumption. Eating habits can be influenced by the food environment around us. In 2014, United Nations Special Rapporteur on the right to health, Anand Grover, released his report, “Unhealthy foods, non-communicable diseases and the right to health”, and called for governments to “take measures, such as developing food and nutrition guidelines for healthy diets, regulating marketing and advertising of junk food, adopting consumer-friendly labeling of food products, and establishing accountability mechanisms for violations of the right to health.”

An early, high-profile, and controversial attempt to identify and curb junk food in the American diet was undertaken by the McGovern Committee (United States Senate Select Committee on Nutrition and Human Needs, chaired by Senator George McGovern) between 1968 and 1977. Initially formed to investigate malnutrition and hunger in the US, the committee’s scope progressively expanded to include environmental conditions that affected eating habits, such as urban decay, then focused on the diet and nutritional habits of the American public. The committee took issue with the use of salt, sugar, and fat in processed foods, noted problems with overeating and the high percentage of ads for junk food on TV, and stated that bad eating habits could be as deadly as smoking. The findings were heavily criticized and rebutted from many directions, including the food industry, the American Medical Association, and the committee itself. In 1977, the committee issued public guidelines under the title, Dietary Goals for the United States, which became the predecessor to Dietary Guidelines for Americans, published every five years beginning in 1980 by the US Department of Health and Human Services.