For many high achievers, the same mindset that fuels business success, perfect execution, total commitment and focus, no compromises, no room for errors, is the very one that can sabotage long-term health goals. Nowhere is this more obvious than in dieting.
Strict rules. Total restriction. Intense short-term focus. This is discipline. For most of us, many times this, “all or nothing” thinking actually produces worse long-term outcomes: binge–restrict cycles, guilt, anger, disappointment, and quitting.
The Psychology Behind “All or Nothing” Thinking
In cognitive behavioral science, perfectionistic thinking patterns are associated to what cognitive-behavior therapists call cognitive distortions. These are thinking errors associated with intense emotions, and depending on how we react or relate to those feelings, they may heavily influence our behaviors. For many of us, those distortions are associated with negative emotions, which we want to avoid or reduce – and to do that we overeat or engage in some other self-defeating behavior.
Common cognitive distortions include:
- Black-and-white thinking: “If I eat one cookie, I’ve blown the whole day.”
- Catastrophizing: “I missed a workout. I’m failing.”
- Overgeneralizing: “I always mess this up.”
These mental habits can increase emotional distress, which in turn makes self-control harder. My doctoral dissertation demonstrated this by having participants just recite out loud some of these distortions, whether they believed them or not. They were hooked up to an EKG and galvanic skin response (GSR) sensors, just like a polygraph. Randomly assigned people recited irrational beliefs out loud or rational ones. And the “irrational” group had more intense negative emotional reactions.
Neurobiologically, perfectionism and rigid control can activate the stress response system, leading to increased cortisol levels, which can promote fat storage and increase cravings for calorie-dense foods (Tomiyama, 2019). And then many of us after craving those foods, eat off plan, have irrational beliefs about ourselves – “I’m a failure,” about what we did, “what a disaster,” and our efficacy and the future, “I’ll never be able to do this.” And what follows – guilt, shame, anger, and oftentimes then apathy. And what do we all crave with those feelings – kale and whey protein powder. I wish. More likely another cycle of eating off plan, thinking badly about ourselves, about our chances of achieving our goals, feeling intense negative emotions, having aversive thoughts, and then more self-defeating behaviors to cope the best we can. It’s a positive feedback loop – a doom cycle that is difficult to interrupt.
In the scientific literature there is also an important concept when it comes to eating off plan. It’s called an abstinence violation in addiction work, and when it comes to weight loss – the “Haagen Dasz effect” or the “What the hell effect!” You may have heard of it, but if you haven’t, if you’re like most of us, you may have experienced it. “Well, I already screwed up, so I might as well keep going.” By being aware of the thought, feeling, behavior loop that can continue cycles of self-defeating behavior and the “What the hell effect” we can learn to short-circuit these pathways.
Why Flexibility Works Better
Studies show that people who use flexible restraint, i.e., modifying goals and expectations without abandoning them, are more successful at maintaining weight loss compared to those using rigid restraint (Westenhoefer et al., 2013). Flexible dieters can navigate life’s inevitable disruptions without spiraling into abandonment of the plan. Learning to get up when we fail, or get back on the wagon after we fall off is the resilience that makes weight-loss maintenance possible. None of us can behave perfectly indefinitely – life usually gets in the way, one way or another, even if we have incredibly high willpower.
Self-compassion and self-acceptance also play critical roles. Research by Neff (2003) shows that self-compassion reduces shame and increases motivation after setbacks. This means slip-ups are treated as normal and temporary, not as proof of failure. Making a mistake, doesn’t make us a mistake, and failing at keeping a plan one day doesn’t mandate failing every time after.
Practical Shifts
Instead of: “I’ll never eat carbs again.”
Try: “I’ll reduce refined carbs during the week and stay mindful of portions.”
Reality: almost the whole weight loss game is calories in, calories out – despite all I can tell you about macro ratios, intermittent fasting, supplements, and exercise routines. Regardless of what days and times you eat carbs, if you’re in a caloric deficit, you will lose weight.
Instead of: “I missed one day at the gym, so why bother this week?”
Try: “One day doesn’t erase the rest. I’ll go tomorrow.”
Reality: it’s better to stay on plan, but missing a workout can rarely make a significant difference over the long-term, and scheduling rest days is important. Overtraining can actually work against us. * For most people, more exercise may not even be associated with weight loss compared to our eating plans. Of course, burning more calories and adding muscle is part of the formula, and though many of us increase our appetites, or even rationalize I can eat more since I exercised, And we have a tendency to overestimate (along with every treadmill and smart watch) how many calories we may actually be burning. But, I emphasize exercise with almost every client because while it might not be (although it can for some) be the most important tool to lose weight, it is the single best predictor of weight loss maintenance. And losing weight is rarely the issue for my clients (or even most of those dieting on their own), it’s keeping from gaining it back – that’s the real challenge. Exercise is not only great for managing our moods, emotions, increasing longevity, and quality of life – it helps us maintain weight-loss.
Bottom line: Sustainable change isn’t about white-knuckling discipline. It’s about building behavioral resilience, the capacity to adapt, recover, and keep going. Over time, those small, flexible adjustments compound into real, lasting results.
References
Neff, K. D. (2003). Self-compassion: An alternative conceptualization of a healthy attitude toward oneself. Self and Identity, 2(2), 85–101. https://doi.org/10.1080/15298860309032
Tomiyama, A. J. (2019). Stress and obesity. Annual Review of Psychology, 70, 703–718. https://doi.org/10.1146/annurev-psych-010418-102936
Westenhoefer, J., Engel, D., Holst, C., Lorenz, J., Peacock, M., Stubbs, J., & Raats, M. M. (2013). Cognitive and weight-related correlates of flexible and rigid restrained eating behaviour. Appetite, 63, 141–146. https://pubmed.ncbi.nlm.nih.gov/23265405/