Effects of Fast Food on the Body
Food is fuel for your body. It has a direct impact on how you feel as well as on your overall health. Fast food isn’t necessarily
bad, but in many cases it’s highly processed and contains large amounts of
carbohydrates, added sugar, unhealthy fats, and salt (sodium).
These foods are often high in calories yet offer
little or no nutritional value. When fast food frequently replaces nutritious
foods in your diet, it can lead to poor nutrition, poor health, and weight
gain. Tests in lab animals have even shown a negative
effect in short duration diets. Being overweight is a risk factor for a variety
of chronic health problems including heart disease, diabetes, and stroke.
According to the Robert Wood Johnson Foundation, most people underestimate the number of calories they’re eating in a
fast-food restaurant. A 2013 study published in JAMA Pediatrics showed that
children and adolescents take in more calories in fast food and other
restaurants than at home. Eating at a restaurant added between 160 and 310
calories a day.
Digestive and Cardiovascular Systems
Many fast foods and drinks are loaded with
carbohydrates and, consequently, a lot of calories. Your digestive system
breaks carbs down into sugar (glucose), which it then releases into your
bloodstream. Your pancreas responds by releasing insulin, which is needed to
transport sugar to cells throughout your body. As the sugar is absorbed, your
blood sugar levels drop. When blood sugar gets low, your pancreas releases
another hormone called glucagon. Glucagon tells the liver to start making use
of stored sugars.
When everything is working in sync, blood sugar
levels stay within a normal range. When you take in high amounts of carbs, it
causes a spike in your blood sugar. That can alter the normal insulin response.
Frequent spikes in blood sugar may be a contributing factor in insulin
resistance and type 2 diabetes.
Sugar and Fat
Added sugars have no nutritional value but are
high in calories. According to the American Heart Association, most
Americans take in twice as much sugar as is recommended for optimal health. All
those extra calories add up to extra weight, which is a contributing factor for
getting heart disease.
Trans fats are a manufactured fat with no extra nutritional
value. They’re considered so unhealthy that some countries have banned their
use. Often found in fast food, trans fats are known to raise LDL cholesterol
levels. That’s the undesirable kind of cholesterol. They can also lower HDL
cholesterol, which is the so-called good cholesterol. Trans fats may also
increase your risk of developing type 2 diabetes.
Too much sodium causes your body to retain water,
making you feel bloated and puffy. But that’s the least of the damage overly
salted foods can do. Sodium also can contribute to existing high blood pressure
or enlarged heart muscle. If you have congestive heart failure, cirrhosis, or
kidney disease, too much salt can contribute to a dangerous buildup of fluid.
Excess sodium may also increase your risk for kidney stones, kidney disease,
and stomach cancer.
High cholesterol and high blood pressure are
among the top risk factors for heart disease and stroke.
Obesity is associated with an increase in
respiratory problems. Even without diagnosed medical conditions, obesity may
cause episodes of shortness of breath or wheezing with little exertion. Obesity
also can play a role in the development of sleep apnea, a condition in which
sleep is continually disrupted by shallow breathing and asthma.
A recent study published in the journal Thorax suggests that children who eat fast food
at least three times a week are at increased risk of asthma and rhinitis, which
involves having a congested, drippy nose.
Central Nervous System
A study published in the journal Public Health Nutrition showed
that eating commercial baked goods (doughnuts, croissants, and, yes, even bran
muffins) and fast food (pizza, hamburgers, and hot dogs) may be linked to
depression. The study determined that people who eat fast food are 51 percent
more likely to develop depression than those who eat little to no fast food. It
was also found that the more fast food study participants consumed, the more
likely they were to develop depression.
A junk food diet could also affect your brain’s
synapses and the molecules related to memory and learning, according to a study
published in the journal Nature. Animal tests have shown a similar
effect. Rats fed a steady diet with over half the
calories from fat (similar to a junk food diet) for just a few days had trouble
completing a maze they had previously mastered in a 2009 study.
Skin and Bones
Chocolate and greasy foods are often blamed for
acne, but they’re not the real culprits. It’s carbs that are to blame.
According to the Mayo
Clinic, because foods that are high in carbohydrates
increase blood sugar levels, they may also trigger acne.
The study in Thorax showed a higher risk of eczema (inflamed,
irritated patches of skin) among children with a diet high in fast food.
When you consume foods high in carbs and sugar,
bacteria residing in your mouth produce acids. These acids can destroy tooth
enamel, a contributing factor in dental cavities. When the enamel of your tooth
is lost, it can’t be replaced. Poor oral health has also been linked to other
Excess sodium may also increase your risk of
developing osteoporosis (thin, fragile bones).
Effects on Society
According to the Centers
for Disease Control and Prevention (CDC), the
definition of obesity is when your body mass index (BMI) is 30.0 or higher. BMI
is a calculation of your height and weight. You can calculate your BMI here. There’s also a category referred to as
“extreme obesity,” which is defined
as a BMI of 40. Across all race groups, one in three Americans is considered
obese while one in 20 is considered extremely obese. Those
statistics are higher in the black and Latino communities. Approximately
75 percent of people in these groups who are over age 20 are considered
Action Coalition (OAC) reports that the number of fast food outlets has
doubled since 1970, a period during which the number of obese Americans also doubled. It’s likely that many factors have
contributed to the obesity epidemic, but the correlation between the
availability of cheap and fattening fast food and national weight increase is
stark. Obesity increases the likelihood of heart disease, high blood pressure,
kidney disease, diabetes, joint problems, and more. In 2008, obesity-related
medical costs were estimated at $147
billion. Diabetes alone was estimated to be
responsible for $69 billion just in lost
productivity. Numbers like these suggest that the costs of cheap fast food are