
Forget diets - "The Shift" revolutionizes weight loss by targeting mindset, not meals. WW's Chief Scientific Officer Dr. Foster's bestseller reveals why self-compassion outperforms self-criticism. What if hating your body actually prevents lasting change? Discover the psychology that transformed thousands.
Gary D. Foster, Ph.D., is the acclaimed author of The Shift: 7 Powerful Mindset Changes for Lasting Weight Loss and a leading behavioral psychologist specializing in sustainable health transformations. As Chief Science Officer at WW (formerly Weight Watchers) and Adjunct Professor of Psychology in Psychiatry at the Perelman School of Medicine, Foster bridges clinical research with practical strategies for lasting weight management. His work emphasizes mindset shifts over restrictive diets, rooted in 25+ years studying motivation, self-compassion, and habit formation.
Foster’s expertise extends to his thought-provoking book Desire, Love, and Identity: Philosophy of Sex and Love, which explores human relationships through psychological and philosophical lenses. A frequent speaker at medical conferences, he translates complex behavioral science into actionable frameworks used by healthcare providers and wellness coaches worldwide.
The Shift has garnered over 1,200 ratings on Goodreads, with readers praising its evidence-based approach to reframing weight-loss challenges. Foster’s insights continue to shape modern wellness strategies, making him a trusted authority in the field of psychological health optimization.
The Shift by Gary Foster presents seven mindset changes to achieve lasting weight loss by focusing on self-compassion, positive thinking, and habit formation instead of restrictive diets. It combines cognitive behavioral therapy and positive psychology to help readers reframe their relationship with food, body image, and self-worth, emphasizing mental shifts over physical restrictions.
This book is ideal for anyone struggling with yo-yo dieting, individuals seeking sustainable weight loss strategies, or those aiming to improve self-esteem and body image. It’s also valuable for caregivers or loved ones supporting someone on a health journey.
Yes—The Shift offers evidence-based, psychology-driven strategies that prioritize mental well-being alongside physical health. Unlike traditional diet books, it fosters long-term habit changes and self-acceptance, making it a standout resource for holistic weight management.
The seven shifts include:
Gary Foster’s approach rejects calorie counting and rigid rules, focusing instead on mindset changes rooted in cognitive behavioral therapy. It emphasizes self-compassion, habit formation, and non-scale victories, making it a sustainable alternative to short-term diets.
Self-compassion replaces harsh self-judgment, reducing the guilt associated with setbacks. Foster argues that kindness boosts motivation and resilience, creating a healthier mental environment for lasting weight loss.
The book encourages readers to appreciate their bodies for their functionality and inherent worth, rather than tying self-esteem to weight. This shift reduces shame and promotes healthier behaviors rooted in self-respect.
Yes—Foster advocates for “small steps” (e.g., 1% daily improvements) to build sustainable habits. This method reduces overwhelm and aligns with research on incremental behavior change.
This concept focuses on refining how you approach challenges (e.g., “How can I move more today?”) instead of fixating on outcomes. It fosters problem-solving and adaptability, key traits for long-term success.
Yes—Foster highlights the importance of community and accountability. Whether through friends, family, or groups like WW (Weight Watchers), support systems enhance adherence and motivation.
The book ties gratitude to emotional well-being, showing that appreciating present-moment joys reduces stress-driven eating. Foster suggests practices like daily gratitude journaling to reinforce positivity.
While praised for its compassionate approach, some reviewers note the book lacks detailed meal plans or exercise routines. However, this omission aligns with its focus on mindset over prescriptive tactics.
著者の声を通じて本を感じる
知識を魅力的で例が豊富な洞察に変換
キーアイデアを瞬時にキャプチャして素早く学習
楽しく魅力的な方法で本を楽しむ
Your thoughts, not just your food choices, determine your weight loss success.
Mindset matters enormously—it's the single biggest influencer.
Self-compassion: treating yourself with the same kindness you'd offer a friend.
You can't be cruel to yourself and expect to stay motivated.
What you think determines what you do.
『Shift』の核心的なアイデアを分かりやすいポイントに分解し、革新的なチームがどのように創造、協力、成長するかを理解します。
鮮やかなストーリーテリングを通じて『Shift』を体験し、イノベーションのレッスンを記憶に残り、応用できる瞬間に変えます。
何でも質問し、学習スタイルを選び、自分に本当に響くインサイトを一緒に作れます。

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Here's a truth that might sting: you already know what to eat. You know vegetables are healthier than donuts, that water beats soda, that walking beats sitting. Yet despite this knowledge, millions of people cycle through diet after diet, losing weight only to regain it, beating themselves up with each "failure." The problem isn't ignorance-it's that we've been asking the wrong question. Instead of "What should I eat?" we should be asking "Why do I think the way I do about eating?" This fundamental shift in perspective has quietly revolutionized weight management, moving from what's on your plate to what's in your mind. After decades working with thousands of people struggling with weight-from research labs to clinical practice-one pattern emerges with stunning clarity: those who succeed long-term don't follow plans perfectly. They develop a different relationship with themselves, one built on understanding rather than punishment. Your thoughts shape your feelings, your feelings drive your actions, and your actions determine your results. Change the first domino, and everything else follows.
When asked what drives weight-loss success, most people answer: discipline, willpower, persistence. The real answer surprises them: self-compassion. Consider Katie, a lawyer who ate three slices of pizza after two flawless weeks. Her inner monologue turned vicious: "You're disgusting. You have no willpower." Yet when asked if she'd speak this way to a struggling friend, Katie recoiled. Of course not - that would be cruel. This double standard reveals a critical misconception: that self-hatred fuels success. Research proves otherwise. People who practice self-compassion after setbacks eat less afterward and lose more weight over time. Self-criticism creates shame, which drives us toward comfort foods. Self-compassion means treating yourself like a friend: acknowledging difficulty, recognizing setbacks happen to everyone, and responding with encouragement rather than contempt. Four thinking patterns particularly sabotage progress. All-or-none thinking sees only perfection or failure. Negative filter thinking fixates on what went wrong while ignoring what went right. Once-makes-always thinking transforms single incidents into permanent patterns: "I overate at one party, so I always overeat at parties." Vague positivity - "I'll do better next week" - offers comfort without strategy. Matthew learned to pause after small indulgences and ask: "What does this really mean for my plans?" That question created space between thought and action, allowing him to choose his response rather than spiral.
Dramatic transformation stories mislead-sustainable change comes from breaking big goals into small, achievable steps that get regularly reinforced. The research reveals a simple truth: behaviors that get rewarded repeat. The question "How did it go well?" proves transformational. Understanding exactly how something worked provides agency over future outcomes. This demands specificity-transforming "eat better" into "eat an orange at 10am on Monday, Wednesday, and Friday." There's a crucial distinction between outcome goals (the destination, like "lose thirty pounds") and behavior goals (the path, like "pre-plan three dinners weekly"). You control the path; you can only influence the destination. Effective goals follow the STAR principle: Specific (exact actions), Truly doable (building competence), Active (what you will do), and Relevant (personally meaningful). Habits transform difficult behaviors into automatic responses. Even when motivation wanes, established habits persist-moviegoers consume stale popcorn simply out of routine. Success requires skillpower, not willpower. Willpower depletes with use; habits function automatically. Those who maintain healthy behaviors don't rely on superhuman self-control-they've designed environments where healthy choices become default options.
We're trained to fix what's broken rather than leverage what works. Sarah, an entrepreneur, successfully navigated business challenges through perseverance and self-belief but approached weight management by cataloging deficiencies. When prompted to apply her business success qualities to wellness, she experienced a powerful shift: "How can I use what already works about me?" Positive psychology identifies twenty-four character strengths across six virtues. Your signature strengths-your top five that come most naturally-are tools for navigating challenges, including weight management. Align your wellness journey with what makes you feel like your best self. If patience isn't your strength, use cleverness to turn meal prep into a puzzle. If you're naturally social, find group activities that energize you. Jim used gratitude to reinvigorate dormant zestfulness, giving him energy for weight loss. Jane used humor to reawaken kindness, watching comedies and sharing clips with her kids, which rekindled connection and engagement in self-care. Dormant strengths aren't weaknesses-they're waiting to be awakened.
Ava avoided bright colors and social gatherings, postponing life until she lost weight. Yet research reveals a counterintuitive truth: people with better body image at the start of weight-loss journeys succeed more than those with poor body image. Hating your body doesn't motivate change-it prevents engagement in health-promoting activities. Weight loss isn't just about "looking better"-it's about function. You move better, sit comfortably, walk without breathlessness, play with kids without pain. Working with Ava meant helping her appreciate her body's current capabilities: how her thighs provided strength for nursing work, how her arms carried her children, how her belly protected her babies during pregnancy. Body image-how you perceive and relate to your body-profoundly affects self-worth. Weight stigma affects over 70% of American adults, leading to extreme thinking and avoiding activities. Developing positive body image takes time-even deciding to try thinking differently is progress. Self-compassion and body appreciation lead to better outcomes than shame.
Many believe they should handle weight management alone, viewing help-seeking as weakness. This isolation makes success harder. Research shows people with strong support systems lose more weight and maintain healthy behaviors. The key is being specific about needs. Instead of vague requests like "be supportive," make concrete asks: "Could you do the dishes tonight so I can take a walk?" or "Please put cookies in the cabinet rather than on the counter." Most "saboteurs" genuinely want to help but lack knowledge about how. Setting boundaries by saying "no" isn't impolite-it benefits relationships when done thoughtfully. We often say "yes" to avoid negative feelings, leading to decisions inconsistent with our intentions. Effective refusals include being vague but firm, depersonalizing, deferring, offering alternatives, or suggesting flexibility. Don't postpone happiness until after weight loss. Research shows the opposite: being happier now makes weight loss easier. When you're happier, you make healthier choices, creating a virtuous cycle. Gratitude-recognizing and appreciating life's good things-powerfully shifts focus from what's wrong to what's right. With practice, your mind naturally notices small joys that accumulate to significantly impact mood. As Krista discovered: "I've applied what I've learned to my entire life, not just food. Even when life isn't perfect, I ask: 'What's one good thing happening today?' The benefits extend beyond weight-my transformed mindset, how I move my body-it's been the whole package."
Lasting change begins with a new way of thinking, not a new diet. Your weight isn't your worth-you deserve care regardless of the number on the scale. Mindset shifts like self-compassion, countering unhelpful thoughts, setting small goals, and finding support take time to develop, just like changing eating habits. This approach moves away from restriction and self-criticism toward compassion and mindful awareness. How you speak to yourself matters more than what you put on your plate. In a world that sells transformation through punishment, the most radical act might be treating yourself with the compassion you'd offer someone you truly love.