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Introduction
 To have a longer life, eating and living healthier is one of the important essential requirements. However, because of the rapid development of society, people have to shorten their time to eat food and work which cause the occurrence of fast food. The development of fast food has changed the consume attitude and lifestyle of people. Nowadays, fast food is considered as tasty, quick, convenient and fashionable food. Although it is convenient to prepare and eat, it change the healthy lifestyle of people and affects human health. Fast food consumption can associated with obesity or even other CVD or other diseases.
Compared to other foods and dishes, fast food is typically less nutritionally valuable. It lacks in micronutrients such as vitamins, minerals, or amino acids, and fiber but has high energy (calories). Expecting fast food, the soft drink which typically contains carbonated water, a sweetener, and a natural or artificial flavoring, are always consumed with fast food in the fast food restaurant, These foods and drinks do not contain the nutrients that body needs to stay healthy. Also, this research found that there is a direct relationship direct relationship between the number of fast food restaurants located within the local area and obesity rates which means fast food and soft drink consumption has opportunity to cause obesity. To avoid the increasing of obesity, it is important to change the fast food’s lifestyle, do more exercise, and consume more nutritional food. Therefore, it is very important to know the nutritional composition of fast food and soft drink and how these ingredients are absorbed and digested in human being body to cause weight gain.
Research
At the beginning, comparing the nutritional compositions of most of the fast food (also called junk food), it contained high calories, high fat content (including trans-fat and polyunsaturated fat), high sugar, high sodium level and also contains some numerous food additives such as monosodium glutamate and tartrazine. More importantly, all these fast food lacks in micronutrients including vitamins, minerals, or amino acids, and fiber which are essential for human health.
Burger is one of the common fast food in fast food restaurant, using it as an example, as the figure 1 showed, a burger contain high calories, saturated fat, trans fat, particularly cholesterol, sodium, carbohydrates (including a little dietary fiber, and sugar), and less protein content.
Firstly, after consuming by human being, the calories in fast food will be oxidized in the body with the formation of acetyl CoA. Excess acetyl CoA is channelized out through mitochondria to do other metabolism. These pathways includes the synthesis and biosynthesis of cholesterol and denovo fatty acid, which cause excess formation of fatty acid and cholesterol.
Secondly, as the figure 2 showed, in the digestion and absorption of the fat in the junk food, at the beginning, it is digested in the oral cavity through the lingual lipase, and it continued through stomach, when the fat in fast food passes through the duodenum the pancreas will releases lipase hormone which breaks down fats and colipase, and the liver will releases bile which is stored in gallbladder and released into small intestine to be the fat emulsifier for digesting hormone. After that, in the pancreases, the enzyme called pancreatic lipase is produced and released into small intestine to breakdown triglycerides become monoglycerides and triglycerides. Then, in the small intestine, it forms micelles, aggregation of fat molecules in droplet form which can move to the brush border and allow lipids to diffuse into epithelial cells. Inside the mucosal cells, fatty acid molecules becomes more fragmented, and are absorbed into the lacteals of the microvilli. Lastly, in the large intestine, unabsorbed fat is boiled by bacteria and  very little fat in normally lost in the feces. consumption of trans fats has been shown to increase the level lipoprotein LDL (often referred as "bad cholesterol"), lowering levels of the lipoprotein HDL (referred as "good cholesterol") by raising levels of the increasing triglycerides in the bloodstream and promoting systemic inflammation. Also, the fried or processed fast food contained oxycholesterol, which is a type of cholesterol may prove to be a lethal compound to heart health. Excess fats and oils along with spices added in these foods act as an irritant to gastric mucosa leading to excess secretion of hydrochloric acid, landing in gastritis.
  Thirdly, the sugar content in fast food are always high. High sugar content will cause dental cavities and type 2 diabetes mellitus. Because fast food do not contain enough amounts of protein and good carbohydrates, the blood sugar levels
suddenly drops after eating, resulting with grumpy, fatigued feeling and a craving for sugar.
Most of the obesity is resulted from an imbalance between the amount of energy taken in, through eating and drinking, and the amount of energy spent on metabolism and physical activity. As the nutritional composition of fast food labeled, it provided very little essential nutrients but high in calories or energy level taken by human beings, which will cause obesity problem.
  In a research paper of Fast Food Consumption, Quality of Diet, and Obesity among
Isfahanian Adolescent Girls (2012), it was conducted to determine the association between fast food consumption and diet quality as well as obesity among girls. According to the results of a national study in Iran, the prevalence of overweight and obesity among then was 4.7% and 10.1%, respectively, and approximately 10% of adolescents were overweight. Because fast foods are rich sources of saturated fatty acids and
trans fatty acids content, consumption of fast food can lead to hyperinsulinemia
and development of insulin resistance. Also, high energy density, high glycemic index, and fatty acid composition of fast foods will increase the prevalence of obesity and
cardiovascular risk factors. During the study, it investigated 140 iranian adolescents by using the systematic cluster random sampling method and food frequency questionnaires were used to assess their dietary intakes of fast food. Also, the diet quality was defined based on energy density and nutrient adequacy ratios (NARs). During the study, the prevalence of overweight and obesity was assessed among the school age (12-17 years old) children of both men and women from India by a cross sectional and institutional studies. n outdoor games six hours per day and doing household activities three hours per day. The logistic regression analysis revealed that the prevalence of overweight was 4 times higher among the adolescents of high socioeconomic status. Therefore, this study found the importance between the lifestyle and weight gain, such as regular physical exercise, doing household activities, regulated television viewing, and healthy eating behaviors can contribute to controlling overweight and obesity. It’s important to maintain a healthy lifestyle and keep fit.
   Conclusion
   In conclusion, in nowadays, obesity problem became more and important in the society life, it affect human body health and can also cause other problems like CVD or high blood pressure. Comparing with many researches paper and studies, it was found that fast food consumption are  which significantly associated with obesity. Because fast food and soft drink provides little essential nutrients but high calories content, especially . Those kinds of ingredients in fast food restaurant will cause energy unbalance of  human body which lead to obesity. Therefore, it is very important to change the lifestyle and avoid consuming fast food and soft drinks for people. It is essential to consume more nutritional food which is rich of vitamin, protein, fiber and so on to balance the requirement of nutrients intake of the human beings. Also, more exercises are required to do with the absorption and digestion of essential nutrients. After avoiding fast food and soft drink consumption, people will become more healthier and decreased the possibility of other diseases to have a better lifestyle.

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