I didn't downvote you, but I think those who did, did so because you might not be up to date on the current research. The difference in caloric needs between those with high metabolic rates and slow (assuming same height and sex) is about 200 calories. Anectodal examples are not scientific, and unless you are monitoring someone 24/7 and tracking them with double-label water, you don't truly know their diet, (although their body will tell the overall truth no matter what they say).