It makes me mad when people do this (explanation below)
When people say something that is not true because it's just an assumption, it's not "directly true". I don't really know how to explain it so I'll give you an example.
People: "Diet soda and artificial sweeteners make you gain weight".
No. They don't. They make you crave more sweets and food, so if you give in to your craving you get fat. That's not the sweeteners making you fat. It's you, not having enough self control, that's making you fat.
The same goes with sleep. "Lack of sleep makes you fat". No, lack of sleep makes you hungrier, not fatter...
I don't mean this only on weightloss, I hear people say stuff like this on every possible subject. I just can't think of any other case right now.
What do you think? Is it annoying to you too?