Lot of theories: None are perfect. These stem around complicated hormonal patterns. Other things that may be at play are classical conditioning like you may have heard related to Pavlov's dogs, stress, particular nutritional deficiencies and even physiologic addiction.
Answered 1/13/2015
3.3k views
3 doctors weighed in across 2 answers
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
90,000 U.S. doctors in 147 specialties are here to answer your questions or offer you advice, prescriptions, and more.
Ask your question