There are vast differences in caloric requirements between individuals. Between a 2m tall man and a 150cm tall lady, yes. Between any two persons of same gende

There are vast differences in caloric requirements between individuals. Between a 2m tall man and a 150cm tall lady, yes. Between any two persons of same gender, similar height and mass, not that vast. One study[1] noted that one standard deviation of variance for resting metabolic rate (how many calories are burnt by living) was 5-8%; meaning 1 standard deviation of the population (68%) was within 6-8% of the average metabolic rate. Extending this, 2 standard deviations of the population (96%) was within 10-16% of the population average. http://www.ncbi.nlm.nih.gov/pubmed/15534426 http://www.ncbi.nlm.nih.gov/pubmed/15534426