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" Junk food" is a term used to describe food that is high in calories from such as sugar and fat, and often also high in sodium, making it hyperpalatable, and low in dietary fiber, protein, or such as and dietary element. It is also known as " high in fat, salt and sugar food" ( HFSS food). The term junk food is a pejorative dating back to the 1950s.
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 restaurants are often equated with junk food, although fast foods cannot be categorically described as junk food. Candy, Soft drink, and highly processed foods such as certain Breakfast cereal, are generally included in the junk food category; much of it 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.
Junk food provides empty calories, supplying little or none of the protein, vitamins, or minerals required for a nutritious diet. Some foods, such as hamburgers, and , can be considered either healthy or junk food, depending on their ingredients and preparation methods. The more highly food processing items usually fall under the junk food category, including breakfast cereals that are mostly sugar or high fructose corn syrup and white flour or milled corn.
Junk food can be defined through nutrient profiling. The United Kingdom's Advertising Standards Authority, the self-regulatory agency for the UK ad industry, takes this approach. Foods are scored for "A" nutrients (energy, saturated fat, total sugar, and sodium) and "C" nutrients (fruit, vegetable, and nut content, fiber, and protein). The difference between A and C scores determines whether a food or beverage is categorized as HFSS (high in fat, salt and sugar; a term synonymous with junk food). Defining junk food as highly processed or ultra-processed food mainly considers the level of processing rather than nutrient profiles.
In , the junk food label is described as nutritionally meaningless: food is food, and if there is zero nutritional value, then it is not a food. Co-editor Vincent Marks explains, "To label a food as 'junk' is just another way of saying, 'I disapprove of it.' There are bad diets – that is, bad mixtures and quantities of food – but there are no 'bad foods' except those that have become bad through contamination or deterioration." Vincent Marks is an Emeritus Professor of Clinical Biochemistry at the University of Surrey.
America also celebrates an annual National Junk Food Day on July 21. Origins are unclear; it is one of around 175 US food and drink days, most created by "people who want to sell more food", at times aided by elected officials at the request of a trade association or commodity group. "In honor of the day," Time in 2014 published, "5 Crazy Junk Food Combinations". Headlines from other national and local media coverage include: "Celebrate National Junk Food Day With... Beer-Flavored Oreos?" (MTV); "National Junk Food Day: Pick your favorite unhealthy treats in this poll" (Baltimore); "Celebrities' favorite junk food" (Los Angeles); "A Nutritionist's Guide to National Junk Food Day" with "Rules for Splurging" ( Huffington Post); and "It's National Junk Food Day: Got snacks?" (Kansas City).
As for the source of junk food's appeal, there is no definitive scientific answer; both physiological and psychological factors are cited. Food manufacturers spend billions of dollars on research and development to create flavor profiles that trigger the human affinity for sugar, salt, and fat. Consumption results in pleasurable, likely addictive, effects on the brain. At the same time, massive marketing efforts are deployed, creating powerful brand loyalties that studies have shown can trump taste.
It is well-established that the poor eat more junk food overall than the more affluent, but the reasons for this are unclear. "A large body of epidemiologic data show that diet quality follows a socioeconomic gradient. Whereas higher-quality diets are associated with greater affluence, energy-dense, nutrient-poor diets are preferentially consumed by persons of lower socioeconomic status (SES) and of more limited economic means. ... However, a convincing causal relation between SES indicators and diet quality still remains to be established." Few studies have focused on variations in food perception according to socio-economic status (SES); some studies that have differentiated based on SES suggest that the economically challenged do not perceive healthy food much differently than any other population segment. "This article's aim is to review and summarize the literature on the perceptions of healthy eating ... Databases, the worldwide web, selected journals and reference lists were searched for relevant papers from the last 20 years. Reviewed articles suggest relative homogeneity in the perceptions of healthy eating despite the studies being conducted in different countries and involving different age groups, sexes, and socio-economic status." Also, "...the small number of studies that focused on variations in perceptions according to socio-economic status..." Recent research into scarcity, combining behavioral science and economics, suggests that, faced with extreme economic uncertainty, where even the next meal may not be a sure thing, judgment is impaired and the drive is to the instant gratification of junk food, rather than to make the necessary investment in the longer-term benefits of a healthier diet.
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. Craving for junk food 'inherited' Mothers who eat junk food during pregnancy may be condemning their children to crave the same diet, according to animal tests. BBC News. 14 August 2007. Study title: "A maternal 'junk food' diet in pregnancy and lactation promotes an exacerbated taste for 'junk food' and a greater propensity for obesity in rat 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.
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.Warren Belasco (1989) Appetite for Change: how the counterculture took on the food industry 1966–1988, pp. 148–153, Pantheon Books
In October 2021, the Ministry of Consumer Affairs of Spain, under the leadership of minister Alberto Garzón, announced a ban on the advertising of several categories of junk food to children under 16. Such advertising would be forbidden on television, radio, online, in , and in newspapers. Affected foods include candy, , , cake, juice, , and ice cream. The ban is to take effect in 2022.
The World Health Organization recommends that governments take action to limit children's exposure to food marketing, stating, "Many advertisements promote foods high in fats, sugar, and salt, consumption of which should be limited as part of a healthy diet. ... Food advertising and other forms of marketing have been shown to influence children's food preferences, purchasing behaviour and overall dietary behaviour. Marketing has also been associated with an increased risk of overweight and obesity in children. The habits children develop early in life may encourage them to adopt unhealthy dietary practices which persist into adulthood, increasing the likelihood of overweight, obesity and associated health problems such as diabetes and cardiovascular diseases."
In the United Kingdom, efforts to increasingly limit or eliminate advertising of foods high in sugar, salt, or fat at any time children may be viewing are ongoing. The UK government has been criticized for failing to do enough to stop advertising and promotion of junk food aimed at children. Supermarkets must stop discounting unhealthy foods to tackle child obesity, say MPs The Guardian A UK parliamentary select committee recommended that cartoon characters advertising unhealthy food to children should be banned, supermarkets should have to remove unhealthy sweets and snacks from ends of aisles and checkout areas, local authorities should be able to limit the number of fast food outlets in their area, brands associated with unhealthy foods should be banned from sponsoring sports clubs, youth leagues and tournaments, and social media like Facebook should cut down junk food advertising to childrenall are currently just recommendations. 'Ban cartoon characters' on unhealthy food, MPs say BBC
In Australia, a Wollongong University study in 2015 found that junk food sponsors were mentioned over 1,000 times in a single Australian cricket match broadcast, which included ads and branding worn on players' uniforms and on the scoreboard and pitch. A coalition of Australian obesity, cancer, and diabetes organizations called on Cricket Australia, the sport's governing body, to "phase out sponsorships with unhealthy brands", emphasizing that cricket is a "healthy, family-oriented sport" with children in the audience.
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