This happens in pigs and other livestock. Animals are specifically bred for their Feed Conversion Efficiency (<a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Feed_conversion_ratio" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Feed_conversion_ratio</a>). I don&#x27;t see why something similar couldn&#x27;t happen in people as well.