There is a fundamental difference between stopping smoking and losing weight.   To stop smoking is a Behavior, while losing weight is a Result, not a Behavior.

When someone quits smoking, they change a Behavior. They stop doing something, namely putting a cigarette in their mouth, lighting it up and inhaling its smoke.

In contrast, losing weight is something that happens – not something one does.

Yes, there are behaviors that may (or may not) lead to weight loss, but the relationship between these Behaviors and the Results -- what happens to those numbers on the scale -- is far from straightforward.

When someone stops putting cigarettes in their mouth, they have successfully stopped smoking. But when someone starts eating breakfast, going to the gym everyday, counting calories - and/or counting bites - and/or cutting carbs, there is absolutely no guarantee that those numbers on the scale will permanently change.  Indeed,...over a lengthy time period... more often than not, their weight will remain exactly the same or even go up.

While we don’t know how a person’s weight will react to such changes in lifestyle, we do know that Someone who eats better, increases their physical activity and gets more sleep will see health improvements – irrespective of what happens to weight.

This reality has important consequences for anyone trying to slim down. All anyone really has control over is their behaviors. When you decide to start eating breakfast and eventually are eating breakfast every day, you will have successfully changed your behavior. Hopefully, this could translate into more energy and better control of your eating for the rest of the day. However, there is absolutely no guarantee anything will happen to your weight.

In fact, even when you decide to cut your daily calories and somehow manage to do so – you will have successfully changed your behavior (to eating fewer calories). But again, there is no way to predict what will happen to your weight. This is because your body will very rapidly adapt to living off fewer calories and will find ways to sustain your body weight even on fewer calories than before. This is the frustrating physiology behind the dreaded “weight-loss plateau.”

All of this is why in behavioral interventions it is important to focus on behaviors and only set behavioral goals – never weight goals. While it is pretty much a guarantee that eating more nutritiously and being more active will make you healthier, there’s no way to tell whether or not these behaviors will lead to permanent weight loss, let alone how little or how much.

Unfortunately, many people set Unachievable and Unsustainable weight-loss goals, which becomes the source of endless frustration. “I’m doing everything right but I am still not losing weight.” In fact, obesity expert, Dr. Sharma, says that: “This is the rule rather than the exception.”

Dr. Arya M. Sharma, M.D. of www.drsharma.ca is a medical doctor specializing in obesity as well as a professor and chair in obesity research and management at the University of Alberta, Canada.   He regularly tells his patients, “If you work on your health behaviors, your health will improve – no matter what happens to those numbers on your scale. You just do what you do and those numbers will do what they do (or not).”

"Approximately two-thirds of people who lose weight will regain it within 1 year, and almost all of them will regain it within 5 years.

Although dieting (ie, caloric restriction) to lose weight is a difficult task, the maintenance of lost weight requires the patient to deploy even greater efforts.

Rather than a simple lack of willpower, the relapse of most individuals to their previous weight after otherwise successful weight loss is largely driven by the coordinated actions of metabolic, neuroendocrine, autonomic, and behavioural changes that oppose the maintenance of reduced body weight.

The few individuals successful at maintaining weight loss (at least 13.6 kg (30 lbs) for at least 1 year) generally have common behaviour and strategies that include consuming low-energy, low-fat diets; engaging in high levels of physical activity; consistent self-monitoring of body weight and food intake; eating breakfast regularly; and demonstrating a high level of dietary restraint.

It is highly unlikely that some of this behaviour can be emulated by most of the population with excess weight.

There is also concern that unhealthy weight control methods (eg, fasting, meal skipping, laxatives, diuretics, stimulants) might ultimately lead to a larger weight regain and pose a risk to both mental and physical health.

Thus, although sustained weight loss with diet alone can be possible for some individuals, agreeing on realistic weight-loss expectations and sustainable behavioural changes is critical to avoid disappointment and nonadherence.

Weight regain (relapse) should not be framed as failure but as an expected consequence of dealing with a chronic and complex condition like obesity."

This has been true for me personally.  See my previous article:  Running DOWN the UP Escalator.

The above article involves a paper about the Widespread Misconceptions About Obesity published in Canadian Family Medicine in November 2014 written by obesity experts - Dr. Sharma et al, and it was originally posted originally posted at his website - Dr. Sharma’s Obesity Notes.