There might; but it does.Is there any evidence of this in .xml, that healing causes hunger?
<perk name="perkSlowMetabolism" parent="skillFortitudeRecovery" name_key="perkSlowMetabolismName" desc_key="perkSlowMetabolismDesc" icon="ui_game_symbol_stomach">
(snip)
<passive_effect name="WaterLossPerHealthPointGained" operation="perc_add" level="1,5" value="-.05,-.25"/>