A High-Fibre Bean-Rich Diet Versus a Low-Carbohydrate Diet for Obesity

J Hum Nutr Diet. 2014 Apr;27 Suppl 2:109-16. doi: 10.1111/jhn.12118. Epub 2013 Apr 30.

Abstract

Background: High-fibre and low-carbohydrate diets may enhance satiety and promote weight loss. We compared a diet rich in beans aiming to increase dietary fibre and promote weight loss with a low-carbohydrate diet in a randomised controlled trial to assess effect and tolerability of the high-fibre bean-rich diet.

Methods and results: One hundred and seventy-three women and men, with a mean body mass index of approximately 36 kg m(-2) (one-fifth with diabetes type 2) were randomised to a high-fibre bean-rich diet that achieved mean (SD) fibre intakes of 35.5 (18.6) g day(-1) for women and 42.5 (30.3) g day(-1) for men, or a low-carbohydrate diet. Both diets were induced gradually over 4 weeks and included a 3-day feeding phase. Among 123 (71.1%) completers at 16 weeks, mean (SD) weight loss was 4.1 (4.0) kg in the high-fibre versus 5.2 (4.5) kg in the low-carbohydrate group [difference, 1.1 kg, 95% confidence interval (CI) = -2.6 to -0.5; P = 0.2], with results similar to the intent-to-treat population. Low-density lipoprotein (LDL)-cholesterol levels decreased with the high-fibre diet (difference in LDL-cholesterol versus low-carbohydrate diet, 0.2 mmol L(-1) , 95% CI = 0.01-0.44 mmol L(-1) ; P = 0.045), as did total cholesterol (P = 0.038), whereas changes in other lipids and glucose did not differ. After 52 weeks, the low-carbohydrate (n = 24) group tended to retain weight loss better than the high-fibre group (P = 0.06), although total cholesterol remained lower with the bean-rich diet (P = 0.049).

Conclusions: A high-fibre bean-rich diet was as effective as a low-carbohydrate diet for weight loss, although only the bean-rich diet lowered atherogenic lipids.

Keywords: beans; dietary fibre; low-carbohydrate; obesity; weight loss.

Publication types

  • Randomized Controlled Trial
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Aged
  • Blood Glucose
  • Blood Pressure
  • Body Mass Index
  • Body Weight
  • Cholesterol, HDL / blood
  • Cholesterol, LDL / blood
  • Diabetes Mellitus, Type 2 / blood
  • Diabetes Mellitus, Type 2 / diet therapy
  • Diet
  • Diet, Carbohydrate-Restricted*
  • Dietary Carbohydrates / administration & dosage
  • Dietary Fiber / administration & dosage*
  • Fabaceae*
  • Female
  • Humans
  • Male
  • Middle Aged
  • Obesity / blood
  • Obesity / diet therapy*
  • Patient Compliance
  • Prospective Studies
  • Triglycerides / blood
  • Waist Circumference
  • Weight Loss

Substances

  • Blood Glucose
  • Cholesterol, HDL
  • Cholesterol, LDL
  • Dietary Carbohydrates
  • Dietary Fiber
  • Triglycerides