I would often go entire days without eating. My family says as a kid or teen I would always cover my food with a napkin to hide what I had not eaten. Even as an adult I would rarely eat a fast food combo there would be half the burger and fries left over. I ate what I need even pop and chips but I ate a bit and when I wasn't hungry I stopped.
In my mid 40s I felt lethargic bad and my face was puffy. Stranger still I was gaining weight and eating more than I ever did. I'd eat when I wasn't hungry which was a bizarre feeling. At the worst I was 190lbs the heaviest in my life. I was not a coffee or tea drinker but I got into energy drinks they made me feel normal.
I went to the doctor and found out it was my thyroid I had hypothyroidism (under active). My Dad had it and now I did rare for men hypothyroidism more common in middle-aged women. My first synthroid pill felt like I'd drank ten energy drinks my skin was warm I felt clear of thought. But now it's stabilized and I think I'm on the downward slide again.