The results, presented at the annual Society for Endocrinology BES meeting in Harrogate, show that lifestyle interventions provide benefits at all stages of obesity management and should be encouraged, no matter what other forms of therapy are offered.
Dr Rob Andrews from the University of Bristol carried out a review of the research on weight loss methods published in international peer reviewed journals. He examined how successful different lifestyle interventions (such as exercise, diet and behavioural therapies) are in the treatment of obesity when carried out alone or in combination with other treatments such as surgery to cause weight loss (bariatric surgery) and weight loss drugs.
Dr Rob Andrews said: “People often forget is that there is no quick fix to obesity. Overeating and decreased activity are the fundamental problems underlying the development of obesity. Any therapy aimed at helping obese patients must have a dietary and exercise component in order to be successful. This review shows that patients who are taking weight loss drugs or have bariatric surgery lose significantly more weight if they combine these treatments with regular exercise and a calorie-controlled diet. Maintaining a healthy, balanced lifestyle is the key to maximising and maintaining weight loss.”
Andrews found that when weight loss drugs are given on their own, with no other changes in lifestyle, they produce an average weight loss of 5 kg, the same amount of weight you lose if you go on a calorie-controlled diet and take regular exercise. However, if weight loss drugs are offered in combination with behavioural therapies, their effectiveness can be increased by over 100% (from 5 kg to 12 kg average weight loss).
The story was the same with bariatric surgery. Patients who exercise and lose weight prior to surgery are less likely to have postoperative complications and lose more weight at a quicker rate after surgery than those who did not.
Overall, this review indicates that when treating obese patients, weight loss drugs and bariatric surgery are significantly more successful if they are offered in conjunction with improvements to diet and exercise.
Full results of the review are:
- Exercise alone produces an average weight loss of 1.8 kg. The more you exercise the more weight you lose.
- Diet alone produces an average weight loss of 5.0 kg. This effect peaks 6-12 months following the start of the diet and wanes after this point. No diet is better than any other in the long term but the greater the reduction in calories, the greater the initial weight loss.
- Behavioural therapies (e.g. cognitive therapy, psychotherapy, relaxation therapy, hypnotherapy) produce an average weight loss of 2.3 kg.
- Exercise plus diet result in an average weight loss of 10.7 kg and helps to maintain weight loss for a longer period.
- Exercise plus diet plus behavioural therapies result in the greatest average weight loss of 12-15 kg.
- Taking weight loss drugs with no changes in lifestyle result in an average weight loss of 5kg. Taking weight loss drugs, in combination with behavioural therapies, leads to an average weight loss of 12 kg.
- Patients that lose more than 10% of their body weight prior to bariatric surgery are 2.12 times more likely to achieve a 70% loss of excess body weight.