Sedentary individuals are often lethargic and show early symptoms of obesity. Less exercise means a slower metabolism. A slower metabolism means that even if an individual is eating what they normally should, it will take them a longer time to burn off the calories they gain.
The answer is oxygenated.
Mutations in the HTT gene cause Huntington disease. Hope that helps
Weight loss is a common symptom of an overactive thyroid.
Melatonin is responsible for sleep and wake pattern known as the circadian rhythm.