Yes, loss of appetite is normal but you must eat atleast 3 meals a day. Reduce the serving sizes but eat. This diet works only as long as we eat. This happens as some believe because of ketosis but I believe it is from not having spikes in the old insulin and drops in the old sugar. Protein is a stabilizer.

Now that these things are stable in my system, hunger is not as intense and I fill up on 1 plate of food instead of 2 or 3. I call this a kinder, more gentler hunger.