I think because it's a poor message to provide people who struggle with their weight and nutrition.
In fact, CICO completely neglects the nutrition aspect of what you eat.
So people tend to be somewhat cavalier and claim it's easy to lose weight, it's just CICO.
But that really isn't the whole story. As any actual qualified scientist in the field of nutrition will tell you.
Of course you absolutely would lose weight eating under your daily calorie requirements of anything at all.
However if you just ate sugar you'd probably began to lose even more weight in all the wrong ways as your body began to shut down and fail due to malnutrition!
FWIW: I've been a participant on food studies with actual scientists at my local Uni :-)
