I found that as I was loosing weight by working out. My body would tend to get colder. I then found out the dehyrdration is partially to blame. So, as I drank more, the fluctuations in body temperature decreased. I also found that overall, I felt colder than when I was heavier, maybe with excess fat and weight, the body would seem to work harder moving around, thus making it feel hotter than usual. Now with loosing weight, we dont exert as much to move, so there isnt an increase in body temperature, thus making us feel cold.