First quick google gives malnutrition as a likely contributor TO hypothermia.
(I bet if I google mild hypothermia, I am going to find the symptoms of seasonal crash)
Obviously more homework to be done.
People most likely to experience hypothermia include:
Very old or very young
Chronically ill, especially with cardiovascular disease
Intoxicated with alcohol or drugs
Mental impairment, e.g. Alzheimer's disease
Underlying medical conditions, e.g. hypothyroidism, stroke, severe arthritis, Parkinson's disease, trauma, spinal cord injuries, burns