Nicotine and its Effects on Weight

Nicotine and its Effects on Weight
Bad breath, yellow teeth, a chronic cough?these are some of the disgusting results of smoking cigarettes. Why do people continue to smoke when the effects are so harmful? The typical response from smokers to this question is that they smoke in order to relax and help relieve stress. Unfortunately, the quick fix happens to be an addictive narcotic. Smoking feeds the addiction, but it also feeds the body with about 40 cancer-causing chemicals as well as almost 4,000 other chemicals . Besides the visible physical effects, smoking increases the risk of heart disease, stroke, cancer, emphysema, chronic bronchitis, and other lung diseases
With the first issuance of health warnings on cigarette packages being more than thirty years ago, logically the number of American smokers should have drastically decreased by now. However, polls show that 32 million Americans continue to smoke according to the American Dietetic Association website (http://www.eatright.org/erm/erm011200.html). Those who continue to smoke, despite the health risks, have decided to take chances with their long-term health rather than sacrifice the immediate benefits of a cigarette. Many current smokers say they are afraid to quit their destructive habit for fear of weight gain associated with the cessation of smoking. The added weight, however, poses a much lower health risk than the continuation of smoking. In order to reach equal health risks of smoking just one pack of cigarettes a day, someone would have to be about 125 pounds overweight (http://www.quitsmoking.com/books/nonag/weightgain.htm).

Negative Effects on Women
Furthermore, the negative effects smoking has on women are especially grim. A site devoted to women and smoking disclose that in the year 2000, women and young girl smokers will have a higher morbidity and mortality rate than that of men. Women smokers have a smaller lung capacity than men, which makes females more vulnerable to the chemicals in cigarette smoke. Also, women smokers have a four times greater chance of developing cervical cancer than non-smokers. Another frightening statistic mentioned in the article says that women who smoked 40 or more cigarettes a day showed a 74% higher risk of developing fatal breast cancer than non-smoking women. Additionally, a woman who smokes has a six-times greater risk of heart attack than men who smoke. Last, women are at a much higher risk for problems during pregnancy if they smoke. Their babies are also put at risk of possible low birth weight, Sudden Infant Death Syndrome, birth defects, future asthma, lower respiratory tract infections, and ear infections (http://www.bewell.com/healthy/woman/1998/smoking/index.asp).

Purpose of Information
The purpose of the plethora of information concerning the termination of smoking induced weight gain is to inform web users of different ways of avoiding weight gain after quitting smoking. To some, the gain seems inevitable, but these sites attempt to change that mindset by offering advice on diet and exercise, as well as some alternative treatments. The majority of the advice given by the websites is pretty standard advice for abstaining from weight gain, however there are a few alternative treatments.

Why do some people gain weight?
The effects of nicotine on appetite

A typical question asked by smokers considering quitting is: Why do some people gain weight when they quit smoking? It all jumps back to the effects of the nicotine found in cigarettes. Nicotine curbs the appetite and triggers the liver to release glycogen, a substance that slightly increases the blood sugar level. Since cessation of smoking means nicotine is not entering the body, an ex-smoker might feel hungry more often. With smoking cessation, the body must readjust to a lower metabolic rate. If an ex-smoker eats the same amount of food as when he or she smoked, the body will end up using fewer calories and storing the extra calories as fat. Smoking also deadens the taste buds, so food will begin to taste better than before, which might account for more food intake. The last reason quitters might gain weight is because of oral fixation. Many ex-smokers desire something to put in their mouths instead of a cigarette, such as food! This contributes to the overeating of quitters . The cause of weight gain is that nicotine keeps a smoker?s weight low, and when someone quits smoking his or her body returns to the weight it would have been had the person never smoked. Also, during the first week after quitting smoking, an ex-smoker might gain three to five pounds due to water retention . According to the Best Health website provided by Wake Forest University Baptist Medical Center, when a person quits smoking their body undergoes major change, which includes better sense of smell and taste. With this change, food may be appreciated more for its taste, which could lead to overeating. Many quitters also feel that high-fat foods are their ?reward? for kicking their nicotine habit. Foods high in fat content may partly suppress the craving for nicotine, but will definitely cause additional weight gain .
Change in Metabolism
Another site discusses how it is the change in the smokers? metabolism that leads to weight gain. Smoking increases the expenditure of calories, which makes it more difficult for the body to store fat, which accounts for a lower body weight for those who smoke. The site states that when smoking cessation occurs, more calories are converted into tissue, which is equivalent to weight gain .

Effects Smoking Cessation has on Body Weight and Plasma Leptin Levels
A study printed in Metabolism explains the relationship between body weight and plasma leptin levels. It is a widely known fact that smokers weigh less than non-smokers of similar ages. Another fact is that smokers usually gain weight after quitting because of an increase in food intake and a decrease in energy expended. The magazine printed that nicotine has a direct effect on adipose tissue metabolism, which diverts fat storage away from adipose tissue during nicotine intake and affects the amount and rate of weight gain after quitting smoking.

Leptin, and endocrine signal, emerged as a protein product after the obese gene was cloned. Leptin is secreted by adipocytes and is believed to regulate body fat stores through hypothalamic control of energy intake and expenditure. The protein reduces food intake, increases energy expenditure, and decreases body weight in rodents. In people, circulation leptin concentrations and adipose tissue leptin gene expression are higher in obese humans. Both of these things increase with weight gain and decrease with weight loss. The study hypothesized that leptin has an effect on the weight-reducing effects of smoking. The study attempted to determine whether leptin has an effect on the weight reduction caused by smoking. The magazine stated that by measuring plasma leptin concentrations in 22 nonsmokers matched for age and bmi with 22 smokers they were able to determine whether the weight reducing effects of smoking may be mediated by leptin.

The study concluded that male smokers have a higher leptin level for a given bmi than men who don?t smoke. Their results showed that after six months of abstinence from smoking, body weight increased by 7%. Even though there is a noticeable weight gain, there was not an increase in the mean leptin concentration after smoking cessation. For most of the men, leptin levels were 25% lower than would be expected for the amount of weight gained after quitting smoking. The study concluded that cigarette smoking elevates the concentration of circulating plasma leptin and this rise in concentration may be one cause for the lower body weight of smokers (Nicklas, Tomoyasu, Muir, and Goldberg, 1999).

Another study printed in the American Journal of the Medical Sciences completely contradicted the study done by Metabolism. This study also investigated the effects of nicotine abstinence on plasma leptin concentrations and lipid metabolism in adult smokers. This study?s methods were to watch six non-obese adult smokers for seven days of nicotine abstinence. The smokers refrained from smoking overnight and then the subjects chewed nicotine polacrilex gum hourly from 7:00AM to 8:00PM. Blood samples were collected at 7:00AM and at 5:00PM on the nicotine intake day. Samples were again taken after seven days of nicotine abstinence. The results returned by the journal stated that nicotine abstinence for seven days did not affect body weight or circulating concentrations of leptin, glucose, insulin, or free fatty acids. However, the high-density lipoprotein (hdl) cholesterol increased dramatically after the nicotine abstinence. This study claims that changes in leptin circulation do not contribute to the weight gain associated with smoking cessation. However, in this study, the administrators did not directly measure leptin gene expression or the rates of leptin production by adipose tissue (Oeser, Goffaux, Snead, and Carlson).

Effects of Nicotine on Rats
A study reported in the American Journal of Physiology discusses the effects of nicotine on rats (Sztalryd, Hamilton, Horowitz, Johnson, and Kraemer, 1996). According to this study, the decrease in adiposity with smoking seems to be caused by nicotine rather than other behaviors related to smoking. The study looked at the cellular mechanisms for lower adiposity seen with nicotine ingestion. In the study, rats were given nicotine or saline for one week and adipocytes isolated from epididymal fat pads. The nicotine-infused rats gained 37% less weight and had 21% smaller fat pads. The nicotine rats also had a 30% decrease of their lipoprotein lipase (lpl) activity, but without any changes in lpl mass or mRNA levels, in epidemymal fat in the fed stage. Lipoprotein lipase is the enzyme, which hydrolyzes circulating trigylceride-rich lipoproteins to fatty acids. The study by Sztalryd et al. states, ?Lipoprotein works as a gatekeeper for trigylceride uptake by adipocytes? (1996, p. E216). These results suggest nicotine diverts fat storage away from adipose tissue and toward utilization by muscle. The study concludes that nicotine does cause alterations in weight.

Change in Diet and Exercise Habits
One site instructs those considering quitting smoking to become more physically active and change his or her eating habits prior to quitting smoking. They suggest at least thirty minutes of exercise most days. The site offers some simple ways to add exercise: gardening, housework, mowing the lawn, playing actively with children, and taking the stairs instead of the elevator. This site also tells a prospective ex-smoker the changes necessary in a diet in order to keep the weight gain off. It directs people towards grain products, vegetables, and fruits. People should also eat lean and low-fat foods and low-calorie beverages as frequently as possible. It commands abstinence from foods high in fat and sugars and low in nutrients . A different source says to have a decent portion of starch food at meals such as rice, pasta, potatoes, or bread. These types of food will help fill the stomach, which makes someone less likely to snack between meals. Some more ideas are to use butter sparingly, have only small portions of cheese, and eat chicken, turkey and fish. These meats are especially low in fat when grilled, baked, or steamed. The article advocates avoiding snacking on foods such as chocolate, biscuits, cakes and nuts .

According to ?walk talk? with Maggie Spilner, the walking editor for Prevention Magazine, one way to manage the weight gain is to watch the intake of food and to walk briskly five to seven days a week for about forty-five minutes to an hour. She mentions that it is alright to split the workout into two or three different sessions if an hour is too difficult all at one time .

Another site mentions that ex-smokers who increased their physical activity as the site suggests only gained 4 pounds over a two-year period. A study conducted by Peggy O?Hara, which appeared in the American Journal of Epidemiology declares that without the increase in physical activity, men who quit gained an average of 16.7 pounds over a five-year period, and women permanently gained 19.2 pounds over the five-year period. The people in the study gained approximately 60-65% of the weight within the first year after giving up cigarettes. These men and women may have gained more weight than is common for most because they were heavy smokers. The website testifies that previous research findings say that the more people smoke, the more weight they will gain once they refrain from smoking .

Lose weight??? And Insulin Resistance
An additional site found on the internet claims it is common to gain about five pounds when someone quits smoking, and only 3% of ex-smokers gain more than twenty pounds. Also, the site asserts that one out of four quitters will actually lose weight when quitting. Another study showed that 23% of ex-smokers lost weight . One study concluded that along with weight gain, smoking cessation is also responsible for improvement in insulin resistance. It further expresses that nicotine is the main ingredient causing insulin resistance, but an unknown chemical is responsible for the weight gain

Nicotine and its Effects on Weight 9.8 of 10 on the basis of 2573 Review.