*Stormforce~beka* I eat normally and don't starve myself but I'm a pretty skinny guy at just over 9 1/2 stone and I feel the cold, my BMI is 19 which is the lower end of normal weight but not classed as underweight. It's 20c in my house and only when it gets this high that I don't shiver to be honest. Only time I sweat is when it's a big heatwave!
I used to be 13 stone a few years ago and never felt cold at all back then, had to take my coat off in winter. That wasn't my natural weight though and never felt good because of it, as my mum and dad were both skinny. I gained that weight through depression and overeating.