Quitting smoking and managing weight

Quitting smoking and managing weight

The average amount of weight that people gain after stopping smoking is about four to five kilograms over five years. Most of the weight gain occurs in the year after quitting, particularly in the first three months.

People who quit smoking can have very different experiences with weight change, ranging from those who lose weight to a minority of people who gain over ten kilograms. Research shows that in the long term, the average body weight of ex-smokers is similar to people who have never smoked.

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Smoking appears to change the distribution of fat in women to the less healthy, typically male ‘apple’ pattern. What this means is that women who smoke tend to put on more fat around their waist compared to women who do not smoke. Fat in this area is associated with risks such as stroke, heart disease, type 2 diabetes and a greater risk of death.

Tips when quitting smoking

Suggestions include:

  • Exercise more often – being inactive is a risk factor for weight gain. Aim for around half an hour of moderate activity every day, for example, brisk walking, gardening, swimming or cycling. You can do 10 minutes of exercise at a time, adding up to a total of 30 minutes over the day, if you prefer.
  • Muscle tissue burns more kilojoules than fat. You can boost your metabolic rate by including one or two weight training sessions into your weekly exercise program to build up muscle.
  • Don’t crash diet. If you eat too few kilojoules, the body will respond by lowering the metabolism and burning muscle tissue for fuel.
  • It can be tricky telling the difference between hunger pangs and withdrawal cravings. Get into the habit of ‘listening’ to your body before you decide to eat something.
  • It takes about 15 minutes for your stomach to signal your brain that it’s full, so wait before having second helpings. You might find you don’t want it after all.
  • Find ways other than eating to cope with withdrawal cravings. Some people drink water, while others count to 100 – experiment until you find your own method.
  • Put safe, non-edible items in your mouth if oral cravings bother you. For example, you could chew on sugarless gum or use a nicotine inhalator.
  • If you need to snack, keep raw vegetable sticks and other low-fat, low-kilojoule foods on hand.
  • Eat more fruit, vegetables and wholegrain foods.
  • Cut back on high-fat, high-salt and high-sugar products. You can do this easily by not stocking these types of foods in your kitchen pantry.
  • Be kind to yourself if you do put on a few kilos. You are boosting your health by quitting smoking.

Causes of weight gain when quitting smoking

The two main causes of weight gain when quitting smoking are thought to be:

  • the effect of nicotine on the body – nicotine is the addictive substance in tobacco that causes smokers to continue their habit. It is not thought to cause cancer. Nicotine speeds up the body’s food processing system, the metabolism. After many years of smoking, smokers tend to weigh slightly less than non-smokers.
  • eating more food – many smokers find their eating habits change when they quit cigarettes. Some people experience increased hunger as a withdrawal symptom, but research suggests their eating patterns eventually return to normal.

Some people who quit smoking eat more, particularly in the first few weeks after quitting. Some of the reasons may include:

  • the feeling of nicotine withdrawal can be very similar to hunger pangs. The person may be ‘fooled’ into thinking they’re hungry when they are not
  • missing the oral satisfaction of putting a cigarette into their mouths prompts some people who have quit smoking to substitute food for cigarettes. Instead of lighting up, they eat something
  • food can be comforting. If a person who has quit smoking is having a hard time during the withdrawal period, they may reward themselves with treats and snacks in an attempt to feel better
  • some people who smoke regularly skip meals – for example, breakfast may be a cup of coffee and a couple of cigarettes. Once you stop smoking, you may find that you don’t feel like skipping meals anymore
  • many people who have quit smoking find that food tastes better, and this may lead to a desire to eat more.

The effect of nicotine withdrawal on the body

Researchers suggest that one of the reasons why people who quit smoking tend to put on some weight after quitting is because their metabolism slows down in the absence of nicotine. Consequently, they burn fewer kilojoules than while they were smoking.

This could explain why some people who quit smoking put on weight even if they do not eat any more than usual.