U.S. doctors online nowAsk doctors free
Mexico
A 21-year-old female asked:

Why is it that some people can eat a lot of high-calorie junk, never exercise, and not put on weight? normal protein intake but high carb & high fat!

2 doctor answers2 doctors weighed in
Dr. Jeffrey Satinover
Psychiatry 39 years experience
Genetics mostly: Some people have inherited rapid metabolisms that convert food (even junk) into immediate sources of energy with relatively little long term storage. There are some fascinating speculations about which geographic regions pushed the evolution of different metabolisms along with different responses to seasons, sunlight, food abundance, predatory threat and so on.
Dr. Jeffrey Bassman
Dentistry 45 years experience
DNA: Doesn't seem fair, but metabolism and dna often dictate how a persons' body can intake and not become obese, while others gain weight so quickly. Just because a person may eat a lot of junk and not gain weight doesn't mean that they are healthy or will remain that way as they age. A nutritionist can really help with the proper advice for particular body types.

90,000 U.S. doctors in 147 specialties are here to answer your questions or offer you advice, prescriptions, and more. Get help now:

Ask doctors free
Educational text
Free
Talk to a doctor
24/7 visits - just $39!
50% off with $15/month membership

90,000 U.S. doctors in 147 specialties are here to answer your questions or offer you advice, prescriptions, and more. Get help now:

Ask doctors free
Educational text
Free
Talk to a doctor
24/7 visits - just $39!
50% off with $15/month membership
Last updated Feb 5, 2014

Disclaimer:

Content on HealthTap (including answers) should not be used for medical advice, diagnosis, or treatment, and interactions on HealthTap do not create a doctor-patient relationship. Never disregard or delay professional medical advice in person because of anything on HealthTap. Call your doctor or 911 if you think you may have a medical emergency.