Objective. Dietary fiber can reduce hunger and enhance satiety, but fiber intake during hypocaloric weight loss diets typically falls short of recommended levels. We examined the nutritional effects and acceptability of two high-fiber hypocaloric diets differing in sources of fiber: (a) beans or (b) fruits, vegetables, and whole grains. Methods. Subjects were 2 men, 18 women, mean age = 46.9, and mean BMI = 30.6. Subjects completed 3-day food diaries in each of the two baseline weeks. Subjects were then randomized to four weeks on one of two 1400-calorie diets including 25–35？g fiber primarily from 1.5 cups beans/day or from fruits, vegetables, and whole grains. Recommended fiber-rich foods were provided. Subjects kept weekly 3-day food diaries and were assessed weekly. Results. Diet conditions did not differ on outcome measures. Both diets increased fiber intake from 16.6？g/day (SD = 7.1) at baseline to (treatment average) 28.4？g/day (SD = 6.5) ( ). Fiber intake was consistent over treatment. Caloric intake dropped from 1623.1？kcal/day (SD = 466.9) (baseline) to 1322.2？kcal/day (SD = 275.8) ( ). Mean weight loss was 1.4？kg (SD = 1.5; ). Energy density and self-reported hunger decreased ( ’s < 0.01) while self-reported fullness increased ( ). Both diets were rated as potentially acceptable as long as six months. Conclusions. Both diets significantly increased fiber intake by 75%, increased satiation, and reduced hunger. Results support increasing fiber in weight loss diets with a variety of fiber sources. 1. Introduction The rising prevalence and disease burden of obesity are well documented. Modest weight loss (5–10%) helps to reduce the risk of developing many of comorbidities of obesity, potentially decreases their severity, and has been associated with increased mood and quality of life. Numerous studies have examined the effects of variations in the components of hypocaloric diets used for weight loss, primarily macronutrient composition. The effects of fiber level have received less attention than that given to macronutrient composition. Epidemiologic data show that fiber intake is inversely associated with body weight and body fat [1]. Relatively few studies have explicitly manipulated fiber content of hypocaloric weight loss diets. Two Scandinavian studies found increased weight loss on a diet incorporating fiber supplements, as well as greater improvement in blood pressure, lower hunger ratings, and better dietary adherence [2, 3]. Thompson et al., using food-based sources of fiber, found no differences in weight loss between a high-fiber diet
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