In many parts of the world, it's not uncommon for hands to be the go-to utensils for enjoying a meal. For most of human history, hands have been the primary tool for most things, food consumption included. Today, the tradition is governed by cultural etiquette rules in much of India, Africa, and the Middle East – the birthplaces of human civilization. In majority-Muslim countries, Islamic doctrine dictates that food should be consumed with the right hand, a decree by the Prophet Muhammad that can be found in the Qur'an. This is one of the reasons why in most Middle Eastern countries, the left and right hands have distinct purposes when it comes to activities involving cleanliness and consumption.

Custom dictates that the left hand should be reserved for bodily hygiene purposes, or "unclean" activities, while the right hand is favored for eating, greeting, and other such "clean" activities. It's best practice to default to the right hand for gift-giving, handing over money, or greeting another person – while the left is primarily for cleaning oneself. For this reason, using the left hand to eat or shake someone's hand is considered not only unhygienic but potentially insulting as well.

Read More: https://www.foodrepublic.com/1573656/why-left-handed-eating-frowned-upon-middle-east/