I didn't look at the site to see if this was taken somewhat out of context, but there is a much more complex math behind caloric needs, known as your Basic Metabolic Rate.
What isn't mentioned clearly in the above quote is that you can easily go under 1200 calories. How? Well, you eat 1200 calories and then you burn off 300 more by exercising to get you down to that 900 a day.
The very first episode of Biggest Loser, Kim was showing how she was recommending 1200-1300 calories a day for her team. She did not say at any time they should go under 1200. The previous female trainer Jillian has an entire book about being fit, and she insists it is dangerous to go under 1200 calories a day as well. So, I think the quote above is misleading; the website should fix that to avoid confusion.
Edited: just looked at the site and one of the first things I found was this:
"If you make a habit of skipping meals or eating only a small amount of calories each day, your body thinks that you are experiencing a famine and your metabolism will slow down to conserve energy. This is exactly what happens with a very low calorie diet."
So, I don't think BL is trying to promote starvation, it's a misunderstanding.
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