Does Fast Food Cause Obesity?

Does fast food cause obesity? In short… yes. While it is certainly not the only cause, in conjunction with other factors, fast food restaurants are a big part of the obesity problem.


In fact, how frequently individuals visit fast food restaurants is directly correlated with their weight. According to a 15-year study of 3,000 adults, people who visited fast food restaurants more than twice per week gained roughly 9 to 11 pounds (4 to 5 kg) more than people who visited them less than once per week.1

The “common sense” reasoning behind the weight gain is that fast food is less healthy than other food, but this assumption is only partially correct.

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Does fast food cause obesity?

Fast food causes obesity for 4 reasons…

Unhealthy Ingredients
Contains More Fat, More Sugar, & More Carbs And Less Vitamins & Minerals

Unhealthy Ingredients: Contains More Fat, More Sugar, & More Carbs And Less Vitamins & Minerals

There are many types of fast food restaurants – from burgers to pizza to chicken to tacos, but despite their unique menus, the underlying content of their food is the same. Most fast food ingredients contain more energy, total fat, saturated fat, carbohydrates and added sugars than healthier food of the same weight. As a result of these less healthy ingredients, eating fast food has been found to be directly associated with both being overweight and exceeding the recommended levels of fat and sugar.2,3

In addition, most fast foods contain substantially fewer vitamins and minerals such as vitamin A, carotene, vitamin C, vitamin E, calcium, magnesium and zinc. Numerous studies have shown that eating healthier foods that contain more of these vitamins and minerals (i.e fruits and vegetables) makes people feel full on less food, leading to more effective weight management.4

Last and possibly most importantly, most fast food menu items contain a high amount of sugar, often in the form of high fructose corn syrup. Evidence is (re)emerging that suggests sugar could be the true cause of the obesity epidemic and many of the obesity-related health problems.

Larger Portions
As Average Weight Has Grown So Have Portion Sizes

Larger Portions: As Average Weight Has Grown So Have Portion Sizes

As popularized by the 2004 documentary Super Size Me (if you haven’t seen it, you can watch it for free here), the problem with the ingredients of fast food is further compounded by fast foods’ growing portion sizes. It’s no coincidence that portion sizes have grown in parallel with the average person’s body weight from the 1970’s through today.5

Research has proven that when given larger portion sizes, the average person will still eat their entire meal regardless of whether or not they feel full.4

Low Cost
2,000- Calorie Diet Of Junk Food Costs 10x Less Than Same Calories Of Healthy Food

Low Cost: 2,000- Calorie Diet Of Junk Food Costs 10x Less Than Same Calories Of Healthy Food

Researchers at the University of Washington found that a 2,000-calorie diet of junk food costs 10 times less than a 2,000 calorie healthy diet. 6 This low cost of fast food encourages people to choose it over more expensive healthier food, which is a big reason that lower-income individuals are more likely to be obese.7

To make things worse, the researchers also found that healthier foods are more likely to increase in cost over time. During their 2-year study, the cost of healthy food went up by 19.5% while the cost of unhealthy food dropped by 1.8%.

Fast Food Restaurants Extremely Prevalent

Convenience: Fast Food Restaurants Extremely Prevalent

The final factor that makes fast food cause obesity is its convenience, or more specifically, how close fast food restaurants are to your home, job or school.

For instance, children that have a fast food restaurant within 0.10 miles of their school have a 5.2% greater chance of being obese. For pregnant women, the same distance to fast food restaurants increases their obesity odds by 2.5%. No other restaurant types have any correlation with obesity rates.8

[ Last editorial review/modification of this page : 10/07/2016]

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