<i>Every single time</i> someone says &quot;I eat the same as them&quot; it&#x27;s been shown to be self-reported, and therefore not verifiable in the least, including this current study. There&#x27;s a show called &quot;Secret Eaters&quot;, you should really check it out. People lie, to themselves included, about how much they eat and how much they exercise. Add to this a 4ft woman will <i>not</i> have the same BMR as a 6ft man, and there&#x27;s no reason to go searching for some external influence.<p>There are psychological issues, to be sure, but except for rare exceptions (like Crohn&#x27;s and extreme outliers, ie, not common) people of the same height and weight are within 200-300Kcal of each other BMR wise (source: <a href="http:&#x2F;&#x2F;examine.com&#x2F;faq&#x2F;does-metabolism-vary-between-two-people&#x2F;" rel="nofollow">http:&#x2F;&#x2F;examine.com&#x2F;faq&#x2F;does-metabolism-vary-between-two-peop...</a>)