lifestyle choices and environments affect parts of the human body and the organism as a whole because the more you eat that's bad for you the more you are putting your body at risk for something bad. In the article http://healthyeating.sfgate.com/reasons-eating-junk-food-not-good-3364.html it states that "Eating junk foods throughout the day causes chronically high insulin levels, which eventually prompts your cells to begin to ignore this important hormone, resulting in a condition known as insulin resistance. Ultimately, obesity and Type 2 diabetes may set in." Knowing this most people should lay off eating out for a while because adding junk food to your diet can make you gain about 6 pounds per year and averaging out can eventually lead to obesity or diabetes. Junk food has also been proven to lead to depression in most teens because it messes with their hormones and leads to mixed emotions.
In the article http://www.livestrong.com/article/359768-why-is-junk-food-bad-for-your-health/ it states that "Combining a diet high in junk foods with a lack of exercise and poor appetite control greatly increases your risk of becoming obese." if you don't control what you eat you are hurting your body and leading to years of being damaged by what you have done in the past. Those who are addicted to fatty junk food are bound to suffer from digestive problems like gastroesophageal reflux disease and irritable bowel syndrome and that’s because junk food is deep fried.
Some choices you make can change your life forever like harming your body with smoking. On the website http://www.livestrong.com/article/204137-why-is-smoking-cigarettes-bad-for-you/ it says "Cigarette smoke is a toxic mixture of more than 7,000 chemicals, many of which may cause cancer and other diseases. These poisonous chemicals enter the lungs, then the bloodstream, which carries them throughout the body, resulting in immediate injury to the blood vessels and tissues." It also states that "Smoking causes atherosclerosis, a disease of the blood vessels that begins with damage to the inner lining of the artery wall. Your body's attempt to heal the damage results in the formation of hard plaques inside your arteries. Eventually, atherosclerosis can disrupt the healthy flow of blood to your heart, brain and other organs and tissues, increasing your risk of developing heart disease and stroke." smoking is very bad for you and every person who smokes has a very larger chance at ending their life earlier.
Most people who do drugs tend to have many problems and issues later in life and they could prevent it if they wanted simply by getting help. "drugs can damage the brain, heart, and other important organs. Cocaine, for instance, can cause a heart attack — even in a kid or teen." from http://kidshealth.org/kid/grow/drugs_alcohol/know_drugs.html. drugs are bad for you and people should give them up if they want to live healthy.