PURPOSE We investigated whether autonomous motivation and self-efficacy might mediate the association between a lifestyle behavior intervention and dietary fat intake in low-income overweight or obese women with young children. METHODS Participants were randomized to an intervention or comparison group. Intervention participants received a 16-week intervention aimed to prevent weight gain through promotion of stress management, healthy eating and physical activity. During the intervention phase, participants viewed a designated video lesson at home and dialed in a peer support group teleconference every week (weeks 1-4) then every other week (weeks 5-16). Potential mediation effects were analyzed using sequential mixed-effects linear models and path analysis. RESULTS The intervention led to increased autonomous motivation (β = 0.34, standard error [SE] = 0.15, P = 0.005), which subsequently increased self-efficacy (β = 0.18, SE = 0.35, P < 0.001), and higher levels of self-efficacy were associated with decreased dietary fat intake (β = -0.22, SE = 0.28, P < 0.001). In other words, autonomous motivation and self-efficacy mediated the association between the lifestyle behavior intervention and dietary fat intake. CONCLUSION To decrease dietary fat intake for low-income overweight or obese women with young children, strategies, such as those promoting peer encouragement, may be warranted in interventions to enhance autonomous motivation and/or practical skills for increasing self-efficacy.

中文翻译：

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低收入超重或肥胖有幼儿妇女膳食脂肪摄入量干预影响的中介因素

目的我们调查了自主动机和自我效能是否可能介导生活方式行为干预与低收入超重或肥胖有幼儿妇女的膳食脂肪摄入量之间的关联。方法 参与者被随机分配到干预组或对照组。干预参与者接受了为期 16 周的干预，旨在通过促进压力管理、健康饮食和体育活动来防止体重增加。在干预阶段，参与者每周（第 1-4 周）和每隔一周（第 5-16 周）在家中观看指定的视频课程并拨入同伴支持小组电话会议。使用连续混合效应线性模型和路径分析来分析潜在的中介效应。结果 干预导致自主动机增加（β = 0.34，标准误 [SE] = 0.15，P = 0.005），随后提高了自我效能（β = 0.18，SE = 0.35，P < 0.001），更高水平的自我效能与减少膳食脂肪摄入相关（β = -0.22，SE = 0.28，P < 0.001）。换句话说，自主动机和自我效能介导了生活方式行为干预与膳食脂肪摄入之间的关联。结论 为了减少低收入超重或肥胖有幼儿的妇女的膳食脂肪摄入量，在干预中可能需要采取诸如促进同伴鼓励的策略，以增强自主动机和/或提高自我效能的实践技能。较高的自我效能水平与膳食脂肪摄入量减少有关（β = -0.22，SE = 0.28，P < 0.001）。换句话说，自主动机和自我效能介导了生活方式行为干预与膳食脂肪摄入之间的关联。结论 为了减少低收入超重或肥胖有幼儿的妇女的膳食脂肪摄入量，在干预中可能需要采取诸如促进同伴鼓励的策略，以增强自主动机和/或提高自我效能的实践技能。较高的自我效能水平与膳食脂肪摄入量减少有关（β = -0.22，SE = 0.28，P < 0.001）。换句话说，自主动机和自我效能介导了生活方式行为干预与膳食脂肪摄入之间的关联。结论 为了减少低收入超重或肥胖有幼儿的妇女的膳食脂肪摄入量，在干预中可能需要采取诸如促进同伴鼓励的策略，以增强自主动机和/或提高自我效能的实践技能。