In the Wiktionary page for this kanji they said that it's a pictogram for someone's mouth over a bowl of rice on a stand .. the question is: are they meaning this was the actual way for eating in this time without using hands? Or this just a symbol?
「食」(to eat) was originally「𠊊」, comprised of a mouth「亼・亽」and a cereal/grain/wheat basket「皀」. In the character「食」,「皀」was later changed into the shape of「艮」.
「亼・亽」is「口」(mouth) written upside-down. This is more evident in the older shapes of「口」:
「亼・亽」functions as a semantic component in characters like 令, 命, 合, 今, among others.
「皀」fell into disuse as an individual character, but the word it represented remained, now written as「簋」, formed by adding「竹」(bamboo) and「皿」(dish; vessel) onto「皀」.
「皀」is a component in characters like 卽 (Shinjitai: 即), 旣 (Shinjitai: 既), 鄕 (Shinjitai: 郷), among others.