According to my doctor it is. This is something that is hyped up with dieters.
If Starvation Mode existed how do you explain Anorexia, Holocaust Victims, Children extremely thin in Africa? They all suffered starvation and have very low body fat. And the Minnesota Starvation Experiment showed that the volunteers in the experiment were still losing fat even though there calories were extremely low.
Im trying to find some evidence on it, but all the results I get are from forums - which cant be quoted for truth.
Lyle McDonald explains it this way: (diet and exercise guru)
In general, it's true that metabolic rate tends to drop more with more excessive caloric deficits (and this is true whether the effect is from eating less or exercising more); as well, people vary in how hard or fast their bodies shut down. Women's bodies tend to shut down harder and faster.
But here's the thing: in no study I've ever seen has the drop in metabolic rate been sufficient to completely offset the caloric deficit. That is, say that cutting your calories by 50% per day leads to a reduction in the metabolic rate of 10%. Starvation mode you say. Well, yes. But you still have a 40% daily deficit.
So is it just something that is blown out of proportion and hyped up? You can say it exists but where is the PROOF that it exists?