Commonly known, fast food can increase weight easily due to high calories and fat in a serving.
Morgan Spurlock proved it through the documentary Super Size Me that made him suffered liver damage and sexual dysfunction.
Recent research conducted by scientists from the University of Bonn adds the reason for not eating fast food.
They found that the way the body responds to foods high in fat and calories just like when fending off bacterial infections when ill.
The findings will be published in the journal Cell.
Using model mice, scientists found that animals that eat fast food develop acute inflammatory responses
"Unhealthy foods cause an unexpected increase in the number of certain immune cells in mice blood and acute inflammation," said Annette Christ, one of the study authors, as reported by Newsweek on Saturday (13/1/2018).
Christ and colleagues gave the cereal diet to mice for four weeks. In that time span, acute inflammation diminishes. But immune cells programmed by unhealthy foods remain the same. That is, the impact in the cell level of unhealthy food consumption lasts longer.
"It has recently been found that the innate immune system has memories," said another study author, Dr. Eicke Latz, a Director of the Institut Immunity at the University of Bonn.
"After infection, the body's defenses remain alert, so they can respond more quickly to new attacks," he continued.
Ginger Hultin, a nutritionist and spokesperson for registered nutritionists for the Academy of Nutrition and Dietetics said eating fast food sometimes has no long-term negative impact.
However, he confirmed that consuming processed foods in excess can cause inflammation.
Dr. Frank Lipman, author of Be Well and founder of Eleven Eleven Healthcare Center in New York City, said the study, published in the journal Cell on Thursday (11/1/2018) was not too surprising. For that matter has Lipman seen in practice.
"This study confirms what I see in my practice every day.Eating fast food, causing health problems," Lipman said.