I know that on the PCOS board you mentioned considering glucophage. I know one of the side effects of glucophage for me was total lack of interest in food. In fact things that I would love to eat all sounded disgusting to me and I couldnt force myself to eat anything.

Sometimes it also happens to me out of the blue where there are weeks I lose any and all interest in food, I dont feel like eating and I struggle to pull in 1000 calories.

I usually try and have something to bring my caloric intake up, sometimes I just dont worry about it.

Eventually my appetite always returns. It just goes in phases. The weather getting warmer might be a big one. Usually when its warmer I have less interest in food.