This has actually been discredited in recent years.
It’s not wrong in the strictest sense, but the macronutrient makeup of the caloric energy has a ton of bearing on how your body processes it (or doesn’t).
The data seems to show that insulin sensitive (healthy) people can lose weight in a simple calorie deficit, but insulin resistant (sick) people can’t. In order to lose weight, these people need to specifically cut carbs and get their body’s insulin response back in order.
In other words the simple, common sense approach that works for you actually won’t work for the fat, sick, unhappy, diabetic people you’re disgusted by.
The best books on this are Brain Energy and Why We Get Sick
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