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Long-term weight loss maintenance for obesity: a multidisciplinary approach

Authors Montesi L, El Ghoch M, Brodosi L, Calugi S, Marchesini G, Dalle Grave R

Received 14 November 2015

Accepted for publication 6 January 2016

Published 26 February 2016 Volume 2016:9 Pages 37—46

DOI https://doi.org/10.2147/DMSO.S89836

Checked for plagiarism Yes

Review by Single-blind

Peer reviewers approved by Dr Colin Mak

Peer reviewer comments 2

Editor who approved publication: Professor Ming-Hui Zou


Luca Montesi,1 Marwan El Ghoch,2 Lucia Brodosi,1 Simona Calugi,2 Giulio Marchesini,1 Riccardo Dalle Grave2

1Unit of Metabolic Diseases, S Orsola-Malpighi Hospital, “Alma Mater Studiorum” University, Bologna, Italy; 2Department of Eating and Weight Disorders, Villa Garda Hospital, Verona, Italy

Abstract: The long-term weight management of obesity remains a very difficult task, associated with a high risk of failure and weight regain. However, many people report that they have successfully managed weight loss maintenance in the long term. Several factors have been associated with better weight loss maintenance in long-term observational and randomized studies. A few pertain to the behavioral area (eg, high levels of physical activity, eating a low-calorie, low-fat diet; frequent self-monitoring of weight), a few to the cognitive component (eg, reduced disinhibition, satisfaction with results achieved, confidence in being able to lose weight without professional help), and a few to personality traits (eg, low novelty seeking) and patient–therapist interaction. Trials based on the most recent protocols of lifestyle modification, with a prolonged extended treatment after the weight loss phase, have also shown promising long-term weight loss results. These data should stimulate the adoption of a lifestyle modification-based approach for the management of obesity, featuring a nonphysician lifestyle counselor (also called “lifestyle trainer” or “healthy lifestyle practitioner”) as a pivotal component of the multidisciplinary team. The obesity physicians maintain a primary role in engaging patients, in team coordination and supervision, in managing the complications associated with obesity and, in selected cases, in the decision for drug treatment or bariatric surgery, as possible more intensive, add-on interventions to lifestyle treatment.

Keywords: obesity, lifestyle modification, cognitive behavior therapy, multidisciplinary treatment

Introduction

The main challenge of obesity treatment is not weight loss, but long-term weight loss maintenance. This widely accepted view is supported by several studies indicating that a healthy weight loss of 5%–10% can be achieved through both behavioral1 and pharmacological treatments,2 but weight is gradually regained in a large percentage of individuals.

Weight loss maintenance is hindered by a complex interaction of environmental, biological, behavioral, and cognitive factors, which are only partly known.3 Their constellation is presented in Figure 1; they variably interact in individual patients to an extent that is difficult to forecast. This explains why a high number of individuals, after a successful weight loss period, regain most of the weight lost. However, a proportion of individuals successfully maintain a long-term weight loss,4 and the study of this cohort, who achieve the goal despite the strong pressures to regain weight, may help identify the factors associated with this desired outcome.

Figure 1 Constellation of factors associated with long-term weight loss maintenance in the general population of obese subjects attending nonsurgical weight loss programs.

The most recent developments of comprehensive lifestyle modification programs combine dietary and physical activity recommendations with specific cognitive and behavior strategies to improve patients’ adherence to a long-term weight management. They confirm that a large subgroup of treated patients is able to maintain a healthy weight loss in the long term.5 These promising data have stimulated the development of multidisciplinary lifestyle modification teams aimed at providing patients with a comprehensive long-term management of obesity.

The aims of this narrative review are: 1) to provide a definition of weight maintenance; 2) to review the data on long-term weight loss maintenance; 3) to describe the characteristics of individuals who successfully achieve long-term weight loss; 4) to review the evidence-based strategies to promote weight loss maintenance; 5) to describe a multidisciplinary approach, based on lifestyle modification aimed at providing patients with a comprehensive long-term management of obesity and its complications.

Definition of weight loss maintenance

In the past 20 years, several definitions have been proposed to define “successful weight loss maintenance”. Wing and Hill6 suggested that successful weight loss maintainers should be defined as “individuals who have intentionally lost at least 10% of their body weight and kept it off at least 1 year”. Rossner7 proposed that a sustained weight loss of about 5%–10% of baseline body weight represents a definite degree of success. This goal has also been recommended by the 2013 AHA/ACC/TOS Guideline for the Management of Overweight and Obesity in Adults.8

The aforementioned definitions share the notion that successful weight maintenance does not necessarily imply a large weight loss, but that a modest 5%–10% amount is sufficient. From a clinical point of view, this amount of weight loss significantly reduces the risk of developing type 2 diabetes in susceptible people,9 and eliminates most of the other risks associated with obesity.8 Moreover, this modest weight loss also improves psychological functioning, in particular, mood, body image, and binge eating.10,11

The Wing and Hill definition6 introduces two additional indicators of weight maintenance. First, weight loss should be intentional. This criterion is important because several studies reported that unintentional weight loss is common and may have causes and consequences totally different from intentional weight loss.12 Second, weight loss should be maintained at least 1 year. This criterion was set as a reasonable target for research on the factors that enable individuals to maintain weight loss. However, it is obvious that the term “successful” would require a much longer period of weight maintenance, hopefully life-long.

Data on long-term weight loss maintenance

Only a few studies have tracked successful weight losers over long-term follow-up or assessed the effect of lifestyle modification programs on long-term weight maintenance.

The National Weight Control Registry (NWCR) was established in 1994 as a prospective investigation of long-term successful weight loss maintenance. In 2014, Thomas et al4 reported a 10-year observation of self-reported weight loss and behavior change in 2,886 participants, recruited primarily through newspaper and magazine articles, who had lost at least 30 pounds (13.6 kg) and kept it off for at least 1 year. The mean weight loss of participants was 31.3 kg at baseline, 23.8 kg at 5 years and 23.1 kg at 10 years. Of note, 87% of participants were still maintaining at least a 10% weight loss after 5 and 10 years. These impressive data show that long-term weight loss maintenance is possible in self-selected weight losers.

The 1999–2006 National Health and Nutrition Examination Survey examined the prevalence and the correlates of long-term weight loss maintenance, defined as weight loss maintained for at least 1 year, in 14,306 US adults.13 The study found that more than one out of every six US adults who have ever been overweight or obese has accomplished long-term weight loss maintenance of at least 10%. Although the period of weight maintenance was much shorter than in the case of the NWCR, the study confirms that also in nonselected individuals in the community, long-term weight loss is possible.

A recent systematic review on the outcome of weight loss lifestyle modification programs found that at 1 year, about 30% of participants had a weight loss ≥10%, 25% between 5% and 9.9%, and 40% ≤4.9%.1 Weight loss reaches its peak within 6 months of the start of treatment, and in the absence of a weight maintenance program, the trend begins to reverse thereafter, with 50% of patients returning to their original weight after about 5 years.14 These data indicate that traditional lifestyle modification programs require a greater focus on long-term maintenance to be considered successful in real terms.15

Hopefully, trials based on the latest generation of weight loss lifestyle modification programs, including the most innovative and powerful cognitive behavioral procedures, should produce even better long-term results. The most striking example is the Look AHEAD (Action for Health in Diabetes) study, which assessed the effects of intentional weight loss on cardiovascular morbidity and mortality in 5,145 overweight/obese adults with type 2 diabetes, randomly assigned to intensive lifestyle intervention (ILI) or usual care (ie, diabetes support and education [DSE]).16 At year 1, more ILI than DSE participants had lost ≥5% of their initial weight (68.0% vs 13.3%), with the ILI group showing an average weight loss of 8.5%, significantly greater than the 0.6% seen in DSE participants. At year 8, 88% of both groups completed an outcomes assessment, which revealed that ILI and DSE participants lost, on average, 4.7% and 2.1% of their initial weight, respectively. Among the ILI and DSE participants, 50.3% and 35.7%, respectively, lost ≥5%, and 26.9% and 17.2% lost ≥10%.17 These impressive figures show that well-conducted lifestyle modification programs can produce clinically meaningful long-term weight loss, but also that the Look AHEAD was not able to completely solve the problem of weight regain in a large percentage of its participants.

The 10-year follow-up of the data of the randomized clinical trial Diabetes Prevention Program (DPP) showed that the cumulative incidence of diabetes, among adults at high risk, remained lower in the lifestyle group, compared with the metformin and placebo arms. This outcome occurred even if the original lifestyle group partly regained weight.18 The results of DPP underline that the effect of lifestyle modification programs may produce significant health benefits even if the weight lost is partly regained.

A few data are also available on the long-term weight loss maintenance with pharmacotherapy. The XENDOS (XENical in the prevention of Diabetes in Obese Subjects) trial, for example, randomized 3,305 patients to lifestyle changes plus either orlistat 120 mg or placebo, three times daily in a double-blind, prospective study. After 4 years, the mean weight loss was significantly greater with orlistat than placebo (5.8 vs 3.0 kg), and the cumulative incidence of diabetes was only 6.2% with orlistat and 9.0% with placebo, corresponding to a risk reduction of 37.3%.19 Therefore, adding weight loss drugs to the lifestyle modification programs not only improves long-term weight loss, but also reduces the incidence of diabetes.

Clinical characteristics of individuals who successfully achieve long-term weight loss

The study of the characteristics of individuals who successfully achieve long-term weight loss is a potential useful strategy to elucidate the factors implicated in the long-term maintenance of intentional weight loss. The pivotal studies and the most recent published reports are presented in Table 1.4,13,15,16,1929

Table 1 Selection of the more relevant/recent trials analyzing factors associated with long-term weight loss maintenance
Abbreviations: LOC, locus of control; RCT, randomized controlled trial; WL, weight loss.

The NWCR, described in the “Data on long-term weight loss maintenance” section, is the most important and longest study assessing the characteristics of individuals who successfully lost and maintained their weight loss, as well as the strategies they use to maintain their weight loss.30 In a large NWCR analysis, the members reported an average weight loss of 33 kg, which was maintained for more than 5 years. The main strategies adopted by members to keep a stable weight in the long term were:31 1) high levels of physical activity (about 1 hour per day); 2) eating a low-calorie, low-fat diet; 3) eating breakfast regularly; 4) self-monitoring weight; and 5) maintaining a consistent eating pattern across weekdays and weekends. An encouraging result is that the chance of longer-term success increases in members who had managed to keep their weight off for 2 years or more. Finally, low levels of depression and disinhibition, and medical triggers (ie, general practitioners or specialists promoting weight loss for medical reasons and/or having a family member with a heart attack) were also associated with weight maintenance.

A random digit-dial telephone survey that used a representative sample of the US adult population compared the behavioral strategies adopted by successful individuals who maintained weight loss (ie, an average weight loss of 37 pounds maintained for over 7 years) with those of individuals who regained weight and weight-stable controls. This study confirmed that maintainers reported higher levels of strenuous physical activity, greater frequency of self-weighing, and continued use of more behavioral strategies to control their dietary fat intake.32

These reports, unfortunately, failed to answer the key question, namely, why some individuals persist in practicing weight-control behaviors, and therefore maintain long-term weight loss, while others abandon it. The fact that several individuals are able to maintain weight loss in the long term clearly demonstrates that the biological pressure on individuals to overeat in order to restore their original weight (the set-point theory)33 is not the only mechanism involved in weight regain. “Complex behaviors” involved in maintenance of long-term weight loss are in part influenced by conscious cognitive processes. Nevertheless, cognitive factors have largely been neglected in traditional weight-loss lifestyle modification interventions, which are based mainly on the principles of behaviorism. The lack of an intensive cognitive intervention has been suggested as one of the reasons for their limited effectiveness in promoting long-term weight loss.34

The QUOVADIS (QUality of life in Obesity: eVAluation and DIsease Surveillance) study, an observational study on 1,944 treatment-seeking obese patients in 25 medical centers authorized to treat obesity by the Italian National Health Service,35 investigated several cognitive factors involved in the long-term weight loss. The study confirmed that some cognitive factors are associated with the amount of weight lost (ie, increased dietary restraint and reduced disinhibition), while others are associated with long-term weight loss maintenance (ie, satisfaction with results achieved, confidence in being able to lose weight without professional help).15 According to these data, there is an urgent need to evaluate the effectiveness of specific procedures and strategies designed to address the cognitive variables associated with negative treatment outcomes. These strategies might help improve the long-term efficacy of weight-loss lifestyle modification programs.

The individual beliefs in the control over personal life (expressed by the concept of “locus of control”) have long been implicated in weight loss and weight loss maintenance, with conflicting results. Very recently, the large MedWeight study confirmed an association between an “internal” locus of control and weight loss maintenance; individuals with an internal locus of control (ie, subjects perceiving they have control over the environment and feeling able to control stimuli) tend to have longer and more sustained weight loss maintenance compared with subjects with “external” locus of control (ie, subjects perceiving that their life is regulated by something outside their control).25 The internal orientation of locus of control is intimately connected with self-efficacy, another psychological domain of interest for weight maintenance.36 Notably, individuals with internal locus of control are more likely to lose weight and maintain weight loss without any external support.25

Personality traits are habitual patterns of behavior, thought, and emotion that are relatively stable over the years, differ across individuals, and may play a role in long-term weight loss by influencing behavior.37 Personality traits, psychological well-being, body image, and eating behaviors have been measured in the QUOVADIS II, an observational study of patients with obesity seeking treatment at eight Italian medical centers. Among personality traits and after adjusting for general confounders and eating disorder scores, only novelty seeking was significantly associated with the ≥10% weight loss goal at 12-month follow-up.38 Similar data were reported in a weight loss lifestyle modification program, in which low novelty seeking was the only personality trait discriminating between patients who were successful in losing ≥10% and those who were unsuccessful.39 These data support the observation that healthy dietary control and dietary restraint (ie, the cognitive control of food intake) are associated with low novelty seeking scores.40

The poor compliance with long-term weight loss programs may also be attributable to the attachment style of individuals. Support for this hypothesis comes from a study showing that 12-month weight loss was significantly greater in patients with secure attachment than in those with insecure attachment, and that the patient–therapist relationship was rated more positively by those with secure attachment.41 These data require replication in a different setting; they indirectly confirm that securely attached adults are more cooperative in a patient–therapist context,42 and that therapeutic alliance is pivotal in the treatment outcome of obesity.

Teixeira et al43 have recently published a meta-analysis on the determinants of healthy behavioral changes influencing weight loss and weight loss maintenance of subjects entering treatment programs. Thirty-five studies were included in the analysis; 42 possible mediators were selected, and their effects on weight loss/weight loss maintenance were assessed by stringent criteria. Overall, the analysis of medium-/long-term weight control (limited to 21 studies) identified higher levels of autonomous motivation, self-efficacy and barriers, self-regulation skills (including self-monitoring), flexible eating restraint, and positive body image as positive mediators for weight maintenance. A few of them were also determinants of physical activity, whereas no consistent mediators were identified for healthy dietary intake. Overall, this analysis points to large differences in the psychological characteristics of the treatment-seeking obese population, which suggests it is necessary to move from a standardized to a tailored approach.

Strategies to promote weight loss maintenance

Several strategies have been evaluated to promote weight loss maintenance. Among them is the provision of an extended care model. Some data showed that group sessions delivered twice a month for 1 year after the weight loss phase, keeping patients in active treatment, help patients maintain the weight loss.44,45 There is also evidence that some people maintain large long-term weight losses with a long-term self-help group pressure and support.46 It has been speculated that an extended care model of treatment provides patients with the support and motivation needed to continue to practice weight control behaviors.47

Recent studies assessed the efficacy of different interventions designed to improve weight loss maintenance, randomizing patients, after a period of weight loss, to one of two active interventions or to a control group with 12–30 months of follow-up. The STOP Regain trial found that a face-to-face intervention and an Internet-based intervention, both emphasizing daily self-weighing and self-regulation, improved weight loss maintenance over a period of 18 months, in comparison with a control group, which received quarterly newsletters.21 This was mainly the case with the face-to-face program. The Weight Loss Maintenance trial found that, after 30 months, the participants allocated to the personal-contact group regained 1.5 kg less weight than those in the self-directed group, whereas those in the interactive technology-based group regained only 0.3 kg less than those in the self-directed arm.22 The TOURS (Treatment of Obesity in Underserved Rural Settings) trial found that obese women from rural communities allocated to 26 biweekly sessions via telephone or face-to-face regained less weight (mean 1.2 and 1.2 kg, respectively) than those in the education control group (mean 3.7 kg).23 Given the importance of motivation and support, a very recent feasibility trial of motivational interviewing showed that face-to-face and phone interviews improved retention in the study, and increased weight maintenance (–2.8 kg vs the control group).27 All these studies confirm that the extended care approach, with monthly or more frequent contacts, in person or via telephone or Internet, can improve successful weight loss. They also reduce the risk of weight regain during the maintenance phase, with the exception of eHealth interventions, where evidence for effectiveness is limited28 and was not confirmed in a meta-analysis.48

However, extended care is not easily accepted by all patients. In a study outside the research setting, only about 15% of cases were still in continuous care after 3 years.20 Future studies should be designed to identify the patients for whom extended care is more suitable, and those more likely to benefit from a shorter duration of treatment. Data from the QUOVADIS study indicate that older patients whose primary motivation for weight loss is improving health are more compliant in continuous care, while patients satisfied with the results they achieved with treatment, and those confident of self-managing additional weight loss may avoid weight gain without continuous professional assistance.20 Finally, all the studies of extended (rather than continuous or indefinite) treatment did not report sufficient follow-up to exclude the occurrence of weight regain after the end of treatment.

To maintain weight loss, individuals must adhere to behaviors that counteract physiological adaptations favoring weight regain.49 Physical activity has modest impact during the weight loss period, but becomes essential to weight maintenance.26 Unfortunately, the level of daily energy expenditure necessary to prevent weight regain is high compared with the modern-day lifestyle,50 and subjects with metabolic disorders do not perceive physical activity as a relevant component of healthy behavior.51 Although total daily energy expenditure is a strong predictor of weight maintenance in obese individuals,52 adherence to a prescribed exercise intensity and/or dose is quite low, also considering the perceived fatigue in accomplishing the desired intensity goals.53

In order to increase motivation and adherence, individuals experiencing problems during weight loss maintenance may be addressed to pleasant programs of leisure-time physical activity.54 Among leisure-time activities, dancing has a remarkable place;55 dance stimulates positive emotions, social interaction, and relationships in the community, while the acoustic stimulation and the music might strengthen the beneficial effects of aerobic exercise on cognitive functions.56 In a pilot nonrandomized trial, a 6-month dance course was associated with similar weight changes but with lower dropout rates compared with self-selected physical activity programs.57 This underlines the importance of social support and pleasant activities to increasing adherence to lifestyle intervention programs and to maintaining long-term weight loss in motivated patients. Self-body perception, enhanced self-confidence, and social support may thus increase self-motivation, facilitating weight loss maintenance in the long term, and overall quality of life.58

Another approach is to add long-term drug treatment to lifestyle change in patients who have been unsuccessful with diet and exercise alone.59 The potential effectiveness of this approach has been demonstrated by the XENDOS trial.19 However, this strategy also does not completely fulfill the needs of obese individuals requiring treatment, for at least three reasons:60 1) most patients do not want to be treated with drugs; 2) the long-term use may be associated with adverse physical complications; and 3) there are situations (eg, pregnancy) in which the treatment would be inappropriate.

A final, scarcely tested strategy is the provision of portion-controlled meals or meal supplements in the long term. An old study with positive results, reporting an average weight loss of 8% at 4 years,61 received partial confirmation in a study in which continuing education and support (monthly meetings) were continued after an intensive weight loss phase. During this 12-month weight maintenance phase, all subjects were encouraged to consume a minimum of 14 portion-controlled meals they had received, free of charge, during the weight loss phase.62 It is, however, unknown whether and how long this strategy may be maintained.

The role of the multidisciplinary team in long-term weight management

Lifestyle modification programs include a weight loss phase, consisting of 16–24 weekly sessions in 6 months, followed by a weight maintenance phase, which should last at least 1 year with monthly or more frequent contacts in person or by telephone.8 The strategies for weight maintenance differ from those used to achieve weight loss, and should include frequent self-weighing (at least weekly), the consumption of a reduced calorie diet, and high levels of physical activity (>200 minutes/week).8

In research settings, lifestyle modification programs have been usually delivered by trained nonphysician health professionals, such as dietitians, or subjects having master’s degree training in exercise physiology, behavioral psychology, or health education. Participants are educated in individual sessions (as in the DPP),9 in groups of about 10–20 participants44 or in a combination of group and individual sessions (as in the Look AHEAD study).16

The American Medical Association House of Delegates has recently declared obesity a “disease” requiring treatment,63 because of the multiple medical, psychological, and functional complications reducing life expectancy and impairing quality of life.64 In this context, these heterogeneous complications require a comprehensive assessment aimed at developing a multidimensional and individualized treatment,64 which is obviously better managed by a multidisciplinary team.

As mentioned earlier, the promising results from long-term weight maintenance obtained by the new-generation, lifestyle modification programs should stimulate the physicians within the multidisciplinary teams to receive adequate training in cognitive behavioral therapy to engage patients in lifestyle modification.65 Engaged patients should then be referred to trained lifestyle counselors (also called “lifestyle trainers” or “healthy lifestyle practitioners”)66 working closely with any other component of an ideal lifestyle modification unit (eg, dietitians, psychologists, physical activity supervisors), to implement both the weight loss phase and the long-term maintenance phase of the lifestyle modification. The physician supervising the team should also manage the medical and psychosocial complications associated with obesity, referring the patients to other physicians and health professionals according to specific comorbidities. Finally, the supervising physicians should periodically monitor the effects of treatment, both on lifestyle and on weight outcomes, and consider the opportunity to intensify the lifestyle approach with obesity drugs, residential rehabilitative treatment, and, in selected patients with severe obesity, bariatric surgery. This multidisciplinary approach based on lifestyle modification has the potential to address several obstacles to reach the optimum long-term management of obesity.

Conclusion

The difficulty in helping obese patients maintain a long-term weight loss has been challenged by recent studies showing that several individuals are able to maintain acceptable weight loss targets in the long term and by the promising results achieved by the new-generation lifestyle modification programs. These promising results should stimulate the adoption of multidisciplinary approaches based on lifestyle modification for the management of obesity. Only comprehensive programs administered by noneclectic teams addressing any mediator of lifestyle modification, managing the several medical and psychological complications associated with obesity and, if indicated, coupling the lifestyle treatment with other interventions (eg, drugs, residential inpatient treatment, bariatric surgery) might be successful. The effectiveness and the cost-efficacy of a stepped-care approach should be evaluated by future longitudinal observational studies.

Disclosure

The authors report no conflicts of interest in this work.


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