Research

Adherence

Self-efficacy and intrinsic motivation are critical predictors of successful weight loss and maintenance, often more so than specific diet macronutrient composition.

Focus on building your belief in your ability to succeed (self-efficacy) and finding intrinsic enjoyment in healthy habits. Use strategies like observing others who succeed, experiencing small benefits, and receiving positive feedback. This psychological foundation is more critical for long-term success than perfecting your diet's macronutrient ratio.

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Increased intrinsic motivation for physical activity remains the strongest predictor of long-term results... psychobehavioral factors are more strongly associated with successful weight management than the satiety effect or other characteristics of diet.
Giulio Marchesini Reggiani et al. · Psychology Research and Behavior Management · 2013

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Based on reviews and studies cited in the paper.

Source

Major factors for facilitating change in behavioral strategies to reduce obesity

Giulio Marchesini Reggiani et al. · Psychology Research and Behavior Management · 2013

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