The long-term effectiveness of a lifestyle intervention in severely obese individuals

Am J Med. 2013 Mar;126(3):236-42, 242.e1-2. doi: 10.1016/j.amjmed.2012.10.010.

Abstract

Objective: Severe obesity (body mass index [BMI] ≥40 kg/m(2)) is a serious public health concern. Although bariatric surgery is an efficacious treatment approach, it is limited in reach; thus, nonsurgical treatment alternatives are needed. We examined the 4-year effects of an intensive lifestyle intervention on body weight and cardiovascular disease risk factors among severely obese, compared with overweight (25 ≤BMI <30), class I (30 ≤BMI <35), and class II obese (35 ≤BMI <40) participants.

Methods: There were 5145 individuals with type 2 diabetes (45-76 years, BMI ≥25 kg/m(2)) randomized to an intensive lifestyle intervention or diabetes support and education. The lifestyle intervention group received a behavioral weight loss program that included group and individual meetings, a ≥10% weight loss goal, calorie restriction, and increased physical activity. Diabetes support and education received a less intense educational intervention. Four-year changes in body weight and cardiovascular disease risk factors were assessed.

Results: Across BMI categories, 4-year changes in body weight were significantly greater in lifestyle participants compared with diabetes support and education (Ps <.05). At year 4, severely obese lifestyle participants lost 4.9%±8.5%, which was similar to class I (4.8%±7.2%) and class II obese participants (4.4%±7.6%), and significantly greater than overweight participants (3.4%±7.0%; P <.05). Four-year changes in low-density-lipoprotein cholesterol, triglycerides, diastolic blood pressure, HbA(1c), and blood glucose were similar across BMI categories in lifestyle participants; however, the severely obese had less favorable improvements in high-density-lipoprotein cholesterol (3.1±0.4 mg/dL) and systolic blood pressure (-1.4±0.7 mm Hg) compared with the less obese (Ps <.05).

Conclusion: Lifestyle interventions can result in important long-term weight losses and improvements in cardiovascular disease risk factors among a significant proportion of severely obese individuals.

Trial registration: ClinicalTrials.gov NCT00017953.

Publication types

  • Multicenter Study
  • Randomized Controlled Trial
  • Research Support, N.I.H., Extramural
  • Research Support, N.I.H., Intramural
  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Aged
  • Blood Glucose / analysis
  • Blood Pressure
  • Body Mass Index
  • Cholesterol, LDL / blood
  • Combined Modality Therapy
  • Diabetes Mellitus, Type 2 / complications
  • Diet, Reducing
  • Exercise Therapy
  • Female
  • Humans
  • Male
  • Middle Aged
  • Obesity / complications
  • Obesity / diet therapy
  • Obesity / therapy*
  • Risk Reduction Behavior*
  • Treatment Outcome
  • Triglycerides / blood
  • Weight Loss

Substances

  • Blood Glucose
  • Cholesterol, LDL
  • Triglycerides

Associated data

  • ClinicalTrials.gov/NCT00017953

Grant support