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A 21-year-old male asked:

Do "naturally skinny" people really have a fast metabolism or do they just eat less without realizing it? how can they defy calories in and out?

1 doctor answer4 doctors weighed in
Dr. Bernard Seif
Clinical Psychology 40 years experience
Metabolism speed: is the factor in between calories in and calories out. So, if one has a fast metabolism, he/she will burn calories more quickly than someone w/a slower metabolism. Many lean folks have a fast metabolism but ones entire lifestyle has to be factored in, e.g, type of food eaten, level of activity, sleep, etc. Peace and good health.

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Last updated May 30, 2016

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