I&#x27;ve always hypothesized that humming while eatting (or saying &quot;Mmmmm&quot;) is the perfect pitch to vibrate the hummer&#x27;s tounge, which makes the flavors experienced more pronounced.<p>It would explain why we say &quot;Mmmmm&quot; not something higher pitched.  Plus you can feel your tounge moving when you say &quot;Mmmmm&quot;.<p>Any thoughts?