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To a point, it is true. This does happen, but it does not last forever.
Basically, when your body takes in its normal calories, like say 2000+ (because lets face it, teenagers do need more than 2000, despite what they may think), your body will take what it needs to replenish what you used, and to store some for later. The rest it will get rid of. Sometimes yes, it does keep a bit more than it needs to.
Now, when you dramatically cut down to about 1000 calories a day, your body is like 'hey where did all the calories go!' Your mind and body will panic, so your mind tells your body to keep all of the calories. It's not used to taking in so little, so it feels like it needs to take advantage of what it can and just take in everything instead of just what it needs.
In some cases that causes to gain weight because from that point, you might be taking in more calories than you would have if you just had 2000 and only kept some.
For people that are annorexic, I don't think this applies only because its something that their body is used to almost, get it? Somebody who is used to taking in 3 full meals a day with snacks won't do too well if they dropped down to 1 or 2 meals. Thats when your body tricks itself into taking in everything and yes, putting on weight.
This doesn't always happen. If you decrease it gradually, like a little less of a snack or a bit less of whatever, then it won't have such dramatic effects. When its sharp, like one day to the next, and continued on like that, then yeah it can happen. Hope that helped.
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