And she lives in a place (region??) called Snowdonia too!

Seriously I was always a really warm heat-emitter till I got too cold for too long and too often when messengering in London. The next 25 years I was cold if the temp dropped below 25 deg C. Then suddenly I returned to My Former Heat-Emitting self...(last summer).
No changes in diet (I'm a vego), a bit of up and down in weight with pregnancies and chemo and stresses, but nothing of clinical proportions

As they say Go figger