Another thing to note that what's required to lose weight is a calorie deficit, not just eating less. This is important, because the body will compensate for a reduced calorie intake by reducing energy expenditure in various subtle ways. Experientially this can feel like having no energy.
None of this changes the basic thermodynamics and reality that to lose weight a calorie deficit is absolutely necessary and that calorie intake is by far the more significant lever available (compared to expenditure), of course -- but again, I personally basically never see anyone dispute this, whereas I regularly see people in the "just eat less, fatty" camp gloss over or misconstrue these nuances as though acknowledging them constitutes a denial of CICO in the strict sense.
None of this changes the basic thermodynamics and reality that to lose weight a calorie deficit is absolutely necessary and that calorie intake is by far the more significant lever available (compared to expenditure), of course -- but again, I personally basically never see anyone dispute this, whereas I regularly see people in the "just eat less, fatty" camp gloss over or misconstrue these nuances as though acknowledging them constitutes a denial of CICO in the strict sense.