Success in adjusting diet does not require '100% compliance for the rest of your life'. It requires serious changes yes, but even frequent slips as part of a largely altered diet won't discount it. This perspective - as well as being factually inaccurate - feeds into shame spirals and negative self efficacy. It's also true that virtuous circles can be built on diet and exercise, replacing the endorphin lift provided by sugar / carbohydrate load; and in the longer term homeostasis can be achieved at a healthier weight. It is difficult, but it's absolutely not as impossible as this comment implies.