I have found all kinds of food changes in me. When I diet (generally 1000 calories) my periods change. It makes me have a period. Not sure why. I have also found that eating less does cause some lack while eating more can be a cure for insomnia.

But this, this was dramatic.

I will note there could be a physical basis. When low carbing I know I have "thyroid" esqe symptoms. My T3 is lower than normal and I have a low heart rate (60 and under) low blood pressure (110 /70) and low body temp. I found out during the course of this that your body uses carbs and the gut to convert T4 into T3. Thus... you get my thyroid when you are eating more carbs. Also I know meat can have amino acids that relax you.